RESEARCH ARTICLE

Task-Induced Functional Connectivity of Picture
Naming in Healthy Aging: The Impacts of Age
and Task Complexity

开放访问

杂志

Perrine Ferré1, Julien Jarret1

, Simona Maria Brambati1,2, Pierre Bellec1,2

, and Yves Joanette1

1Centre de recherche de l’Institut universitaire de gériatrie de Montréal, 蒙特利尔, Québec, 加拿大
2Université de Montréal, Québec, 加拿大

关键词: 功能磁共振成像, 功能连接, healthy aging, picture naming, 语言, task-induced
功能连接

抽象的

The topological organization of the brain, governed by the capacity of brain regions to
synchronize their activity, allows for cost-effective performance during everyday cognitive
活动. Functional connectivity is an fMRI method deemed task-specific and demand-
dependent. Although the brain undergoes significant changes during healthy aging,
conceptual knowledge and word-production accuracy are generally preserved. 这
exploration of task-induced functional connectivity patterns during active picture naming may
thus provide additional information about healthy functional cerebral mechanisms that are
specifically adapted to the cognitive activity at hand. The goal of this study is to assess and
describe age-related differences in functional connectivity during an overt picture-naming
任务, as well as to compare age-related differences under complex task demand, defined by
lexical frequency. Results suggest both age-specific and task-specific mechanisms. 在里面
context of preserved behavioral performance in a picture-naming task, older adults show a
complex array of differences in functional connectivity architecture, including both increases
and decreases. In brief, there is increased segregation and specialization of regions that are
classically assigned to naming processes. Results also expand on previous word-production
studies and suggest that motor regions are particularly subject to age-related differences. 这
study also provides the first indication that intrinsic task demand, as manipulated by lexical
频率, interacts little with the relationship between age and functional connectivity.
一起, these findings confirm the value of task-induced functional connectivity analysis in
revealing the brain organization that subserves task performance during healthy aging.

介绍

The aging of the population worldwide creates both immense opportunities and numerous
challenges regarding health and wellness. This critical demographic change is compelling
neuroscientists to engage in studies of cognition in aging, so they can better understand the
constituents of cognitive health, which is central to quality of life (WHO, 2018). 虽然
many cognitive abilities typically decline with healthy aging, conceptual knowledge is long
preserved (Ben-David, Erel, Goy, & 施耐德, 2015; Goulet, Ska, & Kahn, 1994; Salthouse,
2014). Its impairment may be an early marker of major or mild neurocognitive disorders
(Blackwell et al., 2004; 磨坊主, 罗杰斯, Siddarth, & 小的, 2005; Reilly, Peelle, Antonucci, &
Grossman, 2011). The assessment of conceptual knowledge classically includes picture

引文: Ferré, P。, Jarret, J。, Brambati,
S. M。, Bellec, P。, & Joanette, 是. (2020).
Task-induced functional connectivity of
picture naming in healthy aging: 这
impacts of age and task complexity.
Neurobiology of Language, 1(2)
161–184. https://doi.org/10.1162/
nol_a_00007

DOI:
https://doi.org/10.1162/nol_a_00007

支持信息:
https://doi.org/10.1162/nol_a_00007

已收到: 30 九月 2019
公认: 04 行进 2020

利益争夺: 作者有
声明不存在竞争利益
存在.

通讯作者:
Perrine Ferré
perrine.ferre@umontreal.ca

处理编辑器:
Jonathan Peelle

版权: © 2020 马萨诸塞州
Institute of Technology. 已发表
under a Creative Commons Attribution
4.0 国际的 (抄送 4.0) 执照.

麻省理工学院出版社

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Naming functional connectivity in aging

naming, a sensitive word-production test at the core of many clinical assessment tools (例如,
intraoperative language mapping, differential diagnosis; Moritz-Gasser, Herbet, & Duffau, 2013).
Although older individuals often complain about proper name retrieval (Condret-Santi et al.,
2013), they often obtain accuracy scores similar to those of younger adults when naming pictures
of common names. 然而, this typically occurs at the expense of longer response times (Baciu et al.,
2016; Hoyau et al., 2017; Wierenga et al., 2008) in possible relation with a general slowing in
information processing (Feyereisen, Demaeght, & Samson, 1998). The dissociation between time
and accuracy makes this task particularly interesting, as it suggests that older adults engage in
adaptive mechanisms to perform it adequately. This study thus aims to explore the specific neuro-
functional processes that underlie picture naming, a preserved cognitive ability.

The field of cognitive neuroscience of aging (Cabeza, Nyberg, & 公园, 2016) has revealed a
dynamic interplay between declines in structural and functional resources and plasticity phe-
nomena that support cognitive performance. Consistent patterns of enhanced recruitment with
older age, including greater prefrontal bilateral activation, have been found across many cog-
nitive tasks using task-induced blood oxygen level–dependent (大胆的) amplitude activation dif-
ferences (Cabeza, 2002; 戴维斯, 丹尼斯, Daselaar, Fleck, & Cabeza, 2008). Such manifestations
of functional brain adaptation potentially relate to greater demands for cognitive-control pro-
cesses in older adults (公园 & Reuter-Lorenz, 2009; Schneider-Garces et al., 2010). 什么时候
age-related differences such as decreased specificity and more diffuse brain activity are not as-
sociated with performance, a dedifferentiation phenomenon is invoked (Cabeza et al., 2018).
Although such phenomena have generally been explored using abilities known to decline with
年龄, less is known about the functional organization that sustains a well-preserved ability.

Older individuals may exhibit longer latencies and phonological imprecision (Feyereisen,
1997; Goulet et al., 1994; Shafto, James, Abrams, & Tyler, 2017). Some complain about
word-finding difficulties, but mostly so for proper names and with no relation to objective cog-
nitive difficulty (Condret-Santi et al., 2013). 然而, 一般, their accuracy is preserved,
sometimes even improved, when a simple common names task is used, where accuracy and not
response time is scored, and when there are few time constraints (LaBarge, 爱德华兹, &
Knesevich, 1986; Salthouse, 2014; Schmitter-Edgecombe, Vesneski, & 琼斯, 2000;
Verhaegen & Poncelet, 2013; Wierenga et al., 2008). 全面的, naming abilities for common
names appear behaviorally preserved when task demand is controlled, at least until 65 年
年龄 (Salthouse, 2014). Picture naming typically involves an extensive neural network reflect-
ing every cognitive step required to produce a known word. Although many interindividual var-
iations exist, the core areas have been described in young adults (Duffau, Moritz-Gasser, &
Mandonnet, 2014; Friederici & Gierhan, 2013; Price, 2012; Sarubbo et al., 2016). The occipital
cortex and the middle and inferior posterior temporal cortex are involved in the semantic pro-
cessing of visual attributes, along with the orbital inferior frontal gyrus (IFG) for multimodal pro-
cessing. 一起, the opercular IFG, premotor cortex, insula, and inferior parietal and superior
temporal cortex are in charge of phonological processing and articulation. These core areas,
although segregated, do not operate in isolation. 尤其, age-related neurofunctional re-
organization will often happen at the scale of networks, if not the whole brain, by changing ac-
tivity interactions between regions (Perry et al., 2015; Tomasi & Volkow, 2012; Tsvetanov et al.,
2016). 因此, 功能连接 (FC) is a tool of choice to study neurofunctional mecha-
nisms associated with aging.

FC in healthy aging has been studied mainly using resting-state and associated networks,
such as the default mode network (DMN) (Sala-Llonch, Bartrés-Faz, & Junqué, 2015). 在-
tegrity of DMN connectivity appears to be particularly affected by age and related to perfor-
曼斯 (Mak et al., 2017). Generally speaking, a decrease in within-network FC is reported,

Neurobiology of Language

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Naming functional connectivity in aging

along with increased FC between functionally related regions (Mak et al., 2017; Sala-Llonch et al.,
2015). This pattern appears in line with previous activation studies that demonstrated decreased
deactivation of the DMN during task performance in older individuals (Persson, Pudas, Nilsson,
& Nyberg, 2014). Examples of increased brain FC with regions belonging to the same functional
network but typically not recruited by younger adults have also been detected using lexicose-
mantic tasks (阿加瓦尔, Stamatakis, Geva, & Warburton, 2016; Hoyau et al., 2018; La et al.,
2016; Marsolais, Perlbarg, Benali, & Joanette, 2014; 穆勒, Mérillat, & Jäncke, 2016). 一些
studies of word production have reported BOLD signal increases in parietal, frontal, or temporal
regions with age (例如, Hoyau et al., 2017; 莫尼耶, Stamatakis, & Tyler, 2014), as well as contra-
lateral recruitment (例如, La et al., 2016; Meinzer et al., 2012). Along with an impact of age, effects
of behavioral performance and task demand are also expected: A recent meta-analysis focusing on
semantic cognition and aging (Hoffman & Morcom, 2018) concluded that augmented activation
was principally observed when older adults performed worse than younger adults, 例如,
during tasks drawing on executive functions.

然而, some authors have recently argued in favor of state-dependent differences in re-
gional functional connectivity with age (坎贝尔 & Schacter, 2016; Greene, 高, Scheinost,
& Constable, 2018; Samu et al., 2017). In regard to lexical knowledge, recent evidence points
toward distinct FC patterns for different tasks (例如, synonyms, antonyms, picture naming) 在
老年人 (Ferré et al., 2019; Varangis, Razlighi, Habeck, Fisher, & Stern, 2019).

It is important to note that a task paradigm allows for direct manipulation of the task require-
ments to characterize neural mechanisms that underlie brain-behavior associations and poten-
tial strategic mechanisms (Crowell et al., 2019; Finn et al., 2017; Greene et al., 2018; Persson,
Lustig, 纳尔逊, & Reuter-Lorenz, 2007; Steffener et al., 2014). Prior studies of aging and cog-
nition have concluded that domain-general control processes become more involved when
general cognitive load increases, to which older adults appear particularly sensitive
(Campbell et al., 2016; 公园 & Reuter-Lorenz, 2009; Peelle, 2019; 王, Dew, & Cabeza,
2015). 然而, little is known about the impact of manipulating task requirements through psy-
chometric criteria (Cole, 史密斯, & 贝克曼, 2010). 例如, lexical frequency influ-
ences brain activity and performance during naming (例如, Basso et al., 2013; 伯克,
MacKay, Worthley, & Wade, 1991). 的确, low-frequency words trigger more tip-of-the-
tongue states than high-frequency words (Burke et al., 1991), and older adults have more dif-
ficulty producing the correct name for low-frequency items (Au et al., 1995; LaGrone &
Spieler, 2006; Rogalski, Peelle, & Reilly, 2011). Lexical frequency thus offers another way
to manipulate the requirements of a picture-naming task, using intrinsic task characteristics.

The general aim of this study is to characterize possible age-related differences in task-
induced FC, using a picture-naming task, while considering the impact of lexical frequency
as an indicator of task difficulty.

The first goal was to assess and describe age-related differences in FC of the regions acti-
vated by the picture-naming task as well as in the DMN during word production. On the basis
of previous reports of increased activity during task performance, older adults were expected
to show higher FC in the regions activated by the task, in relation to greater reliance on lifelong
accumulated semantic knowledge (Agarwal et al., 2016; Hoyau et al., 2018; Marsolais et al.,
2014; Tran et al., 2018) or domain-general control mechanisms (Cabeza et al., 2018; Geerligs,
Maurits, Renken, & Lorist, 2014; La et al., 2016). Decreases in FC within DMN regions, 沿着
with increases in the rest of the brain, are also expected during task performance, in line with
most previous FC studies of aging (Andrews-Hanna et al., 2007; Damoiseaux et al., 2008;
Geerligs et al., 2014).

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Naming functional connectivity in aging

The second goal of the study was to describe the differential impact of lexical frequency on FC
as a function of age. Differences between conditions were expected to be larger for older adults
and to indicate enhanced connectivity, as a result of more demanding psycholinguistic process-
ing and as observed in the context of greater task demand (Avelar-Pereira, Bäckman, Wåhlin,
Nyberg, & Salami, 2017; 坎贝尔 & Schacter, 2016; Dixon et al., 2017; Dubois & Adolphs,
2016; Geerligs, 鲁比诺夫, & Henson, 2015; Grady, Sarraf, Saverino, & 坎贝尔, 2016).

By gathering such a task-specific set of information, this study offers a baseline for further
exploration of adaptive mechanisms subserving the preservation of cognition throughout life.

METHOD

Population

Seventy-two participants (38 young adults, 34 老年人) gave their informed consent to
participate in this study, in accordance with local ethics committee guidelines. 参加者
were native French speakers and right-handed, and were free of neurological disorders and
a history of drug or alcohol dependency, major depression, or moderate to severe auditory
or visual disorders. Adults 65-years-old or older underwent a cognitive and hearing screening.
The Montreal Cognitive Assessment (Nasreddine et al., 2005) was used to test for mild cogni-
tive impairment, with a standard cutoff score of 26. A pure-tone test was used to ensure that all
older participants had hearing acuity within ISO standard 7029:2000. 此外, 广泛的
screening questionnaires were used to exclude participants with MRI contraindications. 这
final sample, after quality control of fMRI preprocessing, 包括 37 young adults and 31 较老的
adults (桌子 1).

Task Design

Participants were asked to complete an overt object naming task during fMRI data acquisition:
The Boston Naming Test (BNT) (古德格拉斯, 卡普兰, & Weintraub, 1983). The BNT is among
the most widely used picture-naming tasks in both clinical and experimental settings. 它是
therefore considered to provide a basis for knowledge development. Participants were asked

桌子 1. Demographic and behavioral characteristics

Age group
Mean age (标清)

性别 (male/female)

Mean years of education (标清)

[min–max]

Mean accuracy (标清) [min–max]

BNT

BNT – easy condition

BNT – hard condition

18–35 (N= 37)
26 (5.2)

61–80 (N= 31)
70 (5.5)

21/16

12/19

14 (3.3) [9–20]

14 (3.4) [11–21]

45 (7.7) [24–57]

27 (2.9) [23–30]

18 (5.1) [7–27]

48 (5.5) [34–55]

28 (2.2) [26–30]

17 (3.9) [9–25]

BNT – reaction time (seconds)

1284 (189.3) [959–1815]

1423 (208.1) [1001–1906]

MoCA

–

28 (1.2) [26–30]

BNT, Boston Naming Test; MoCA, Montreal Cognitive Assessment.

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Naming functional connectivity in aging

to name the pictures they saw on the screen aloud, as fast as possible. Word-production pro-
cesses occur rapidly, typically within 600 ms of seeing an object (Indefrey & Levelt, 2004).
Pilot acquisitions with both young and healthy older adults occurred before settling on the
final task paradigm.

Each of the 60 BNT stimuli was presented for 1,500 多发性硬化症, and participants had an additional
1,500 ms to give their answer before the next trial. A long allowable response time was pre-
ferred because it is only after 700 ms that neurofunctional response to the tip-of-the-tongue
phenomenon is typically observed (Shafto & Tyler, 2014); 而且, the pilot acquisitions sug-
gested the same thing. Many previous FC studies used resting-state and offline performance
措施 (Sala-Llonch et al., 2015), but those methods are suspected of reflecting the actual
cognitive processes during the task less closely (坎贝尔 & Schacter, 2016; Tran et al., 2018).
因此, an overt naming task was preferred in this study. An interstimulus interval of 350 多发性硬化症
separated the stimuli. A fixation cross indicated the end of the trial. The task was composed
的 12 blocks lasting 17.5 s, with five images each to be named. The blocks were separated by
rest epochs (fixation cross) lasting 17.5 s, for a total of 145 volumes. Half of the blocks had a
low frequency (high requirement) 等级. Linguistic complexity was defined by the lexical fre-
quency obtained from the French lexical database lexique3 (http://lexique.org/). To validate
the assumption that a frequent item should generally be named successfully, each item’s cat-
egorization was compared with the success rate of the test item from the French norms: A word
designated as frequent systematically triggered 80% 成功 (罗伯茨 & Doucet, 2011).

Behavioral Analysis

Accuracy (number of correct responses given in the maximum time window) 和回应
次 (RT) for all naming trials were first analyzed to determine whether task performance
was similar across age groups. Three trained raters independently scored the accuracy results
and reached a consensus. Age groups were compared for their total score as well as each
frequency level using two independent sample t tests. An analysis of variance (ANOVA) 经测试
the relationship between age group and accuracy or RT for each frequency level. No devia-
tions from homoscedasticity or normality were observed. Three individuals were excluded
from the behavioral analysis because of technical issues resulting in missing data (例如, 和-
plugged microphone, inaudible answer). 桌子 1 presents all the behavioral results.

fMRI Scanning and Data Processing

MRI images were acquired with a 32-channel head coil and a 3T SIEMENS TrioTim magnetic
resonance imaging system. Participants were instructed to limit their movement to the extent
可能的, and a practice session was held before the scanning session to ensure they knew how
to limit their movement. Foam rubber pads within the head coil also restricted head movement.
Earplugs reduced scanner noise. A microphone was oriented toward the mouth to allow vocal
记录, using MR Confon (https://www.crsltd.com/tools-for-functional-imaging/audio-for-
fmri/mr-confon/). When necessary, vision was corrected using MRI-175 compatible lenses that
matched the distance prescription used by the participant. The task stimuli were presented using
DMDX presentation software (Forster & Forster, 2003).

Anatomical images (T1) were acquired with a Multi echo multi planar rapid gradient echo
pulse sequence and a Generalized autocalibrating partial parallel acquisition (GRAPPA) 交流电-
celeration factor using the following parameters: field of view (FoV) = 256.0 mm2, 矩阵大小=
256 × 256, 176 slices covering whole brain, 1 mm isotropic voxel size, echo time/repetition time
(TE/TR) = 1.64/253 多发性硬化症, flip angle = 7.0°.

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Naming functional connectivity in aging

Functional images (T2*) were acquired with an echo-planar imaging pulse sequence and a
GRAPPA acceleration factor using the following parameters: FoV = 220 × 220 毫米, 矩阵大小=
74 × 74, 50 ascending slices covering the whole brain, 3 mm isotropic voxel size, TR/TE =
3,000/20 多发性硬化症, flip angle = 90°. T2* image acquisition was oriented −30° from the anterior
commissure–posterior commissure line (to reduce the signal loss from the anterior temporal
lobes). The first five volumes of each run were automatically discarded during acquisition.

预处理

Preprocessing of structural and BOLD functional metrics was done using SPM12 (http://万维网.
fil.ion.ucl.ac.uk/spm/) and CONN toolboxes (v.18.b; www.nitrc.org/projects/conn) imple-
mented in Matlab 2015b (https://www.mathworks.com/). Functional images were first coregis-
tered and realigned to account for minor head motion using the CONN preprocessing
pipeline.

Using the VBM12 toolbox in SPM12 (http://dbm.neuro.uni-jena.de/wordpress/vbm/), 核-
gistered structural (T1) images were segmented into gray matter, white matter, and cerebrospi-
nal fluid, with a sampling of 1.5 mm × 1.5 mm × 1.5 mm using trilinear interpolation. 后
segmentation, we performed image normalization using Diffeomorphic Anatomical
Registration through Exponentiated Lie (DARTEL; Ashburner, 2007) to create a custom tem-
plate. The flow field images obtained during the DARTEL template creation were used to warp
all realigned functional images and the coregistered structural images into the Montreal
Neurological Institute (MNI) 空间. Images were modulated by multiplying the Jacobian de-
formation parameters defined during normalization to preserve the total amount of original
gray matter before normalization (Ashburner & 弗里斯顿, 2005; Zhu et al., 2013). 下一个, the mod-
ulated/warped images were smoothed with a 6 mm full-width at half-maximum (FWHM) iso-
tropic Gaussian kernel and normalized into the MNI space.

Functional images were coregistered to the structural T1 images obtained during the pre-
vious realignment step using CONN options. Smoothed normalized images were entered in
the CONN toolbox.

A motion-censoring procedure was applied to remove unwanted motion, 生理,
and other artifactual effects from the BOLD signal. An ART-based functional outlier detection
method was used, as implemented in the CONN toolbox (Mazaika, Whitfield, & 库珀,
2005). The threshold was established using the maximum voxel displacement with a scrub-
bing criterion established at 0.9 mm scan-to-scan head motion or global signal intensity 5 标清
above the mean signal for the session (Mazaika, Hoeft, Glover, & Reiss, 2009; Whitfield-
Gabrieli & Nieto-Castanon, 2012). A dummy variable represented each outlier in the first-level
denoising step. The mean number of invalid scans was 4.84, 或者 3.34% of the total number of
volumes. Three participants who presented more than 25% outliers out of their total volumes
were excluded from further FC analysis.

An anatomical component-based noise correction method was also applied (Behzadi,
Restom, Liau, & 刘, 2007), regressing the white matter and cerebrospinal fluid from the
BOLD signal. This method has proven useful to improve the specificity of connectivity mea-
surements (Muschelli et al., 2014), and it partially reduced the effect of vascular health on FC
措施 (Geerligs, Tsvetanov, & Henson, 2017).

The six realignment parameters (with their first temporal derivatives) and the task effect

(BOLD time series orthogonalization to task effects) were also included as regressors.

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Naming functional connectivity in aging

最后, a high-pass filter (<0.01 Hz) was applied after nuisance regression, to filter signals related to physiological or motion artifacts (Muschelli et al., 2014; Satterthwaite et al., 2013). A high-pass filter has been demonstrated to produce stronger, more reliable age effects than a bandpass filter (Geerligs et al., 2017). Quality assessment was performed before and after denoising, by visually inspecting the overlay of functional and structural individual realigned images, the overlay of the functional images and the MNI template, as well as the BOLD functional time points movie and distri- bution of the scrubbed volumes across time. One participant was excluded from further FC analysis because of an isolated but massive amplitude movement. No other anomalies were noted. In total, 4 participants were excluded of the initial 72. The remaining sample was com- posed of 68 individuals: 37 young adults and 31 older adults. Functional connectivity fMRI analysis Regions of interest (ROIs) were defined based on the BOLD signal characterizing the execution of the naming task (the main effect of naming contrast). This method reduces the number of observations and guides the FC data analysis. Reduction allows for easier and clearer interpre- tation and is deemed a simple yet powerful method (Fjell & Walhovd, 2016). Task-induced ROI definition. A data-driven approach using a task- and sample-specific template was favored over canonical resting-state networks because the latter may be less sensitive to task-related changes in network connectivity (Crowell et al., 2019; Davis, Stanley, Moscovitch, & Cabeza, 2017). For example, several of the networks found in the left perisylvian language regions during active language tasks (e.g., left inferior frontal, posterior temporal, and inferior parietal cortices) may appear as a single network of correlated regions using a resting state (Jackson, Hoffman, Pobric, & Lambon Ralph, 2015; Liljeström, Stevenson, Kujala, & Salmelin, 2015; Tran et al., 2018). Thus, seed ROIs were based on the whole brain statistical parametric map of the task main effect for the whole sample. However, to reduce the number of observations and limit redundancy, we selected the activation peaks that best summarized the whole brain activation maps in the whole brain for the whole sample. First, voxel-wise T-maps were constructed for each subject using a task > rest contrast (任务
main effect). Second-level group analyses were then performed to test for significant differ-
ences across groups. Activation peaks of the union of the task main effect maps (t tests) in both
age groups were determined. A sphere was centered on each peak with a radius of 7 mm using
MARSBAR (http://marsbar.sourceforge.net). The Euclidean distance between the centroid’s co-
ordinates in the standard MNI space was also calculated, to verify that the distance between
peaks was at least twice the width of the smoothing kernel (IE。, 12 毫米).

第二, we grouped the activation peaks according to responses during the task and se-
lected the most relevant from each grouping. A one-sample t tests was computed for all partici-
pants using all activation peaks during the task condition. An ROI-to-ROI hierarchical
clustering algorithm sorted all regions and grouped ROIs showing the most similar time series,
using a network-based statistic (NBS; 扎莱斯基, 假如, & 布莫尔, 2010) with a false discov-
ery rate connection-level threshold of p < .0001 at the analysis level. The ROI with the largest size (i.e., the number of suprathreshold connections between this seed and all other ROIs) in each cluster was selected for further seed-to-voxel analysis. To better compare these results with the literature, one additional seed was selected to rep- resent the DMN. Age-related differences in DMN connectivity have indeed been consistently Neurobiology of Language 167 l D o w n o a d e d f r o m h t t p : / / d i r e c t . m i t . e d u n o / l / l a r t i c e - p d f / / / / 1 2 1 6 1 1 8 6 7 6 9 1 n o _ a _ 0 0 0 0 7 p d . / l f b y g u e s t t o n 0 7 S e p e m b e r 2 0 2 3 Naming functional connectivity in aging reported, especially in the posterior cingulate cortex (PCC; Andrews-Hanna et al., 2007; Chan, Alhazmi, Park, Savalia, & Wig, 2017; Geerligs et al., 2014; Kong et al., 2018; Tomasi & Volkow, 2010). In sum, a total of six ROIs were selected for further seed-to-voxel FC analysis. Functional connectivity statistics. The spatial topography of seed-to-voxel FC was examined using the selected ROI spheres defined as seeds in previous steps. Seed-to-voxel connectivity was measured at the first level using an haemodynamic response function-weighted general linear model (which deweights the initial scans within each block). The Fisher transform of the Pearson correlation between each seed time series and all other voxels was calculated. Group-level analysis in CONN implemented repeated-measures analyses using the ReML estimation of covariance components and evaluated through F-statistical parameter maps. Correction for multiple comparisons was done using a combined voxel-level height threshold ( p < .001 uncorrected) and a cluster extent threshold ( p < .05 family-wise error [FWE] corrected). Connectivity maps were automatically labeled by CONN using the anatomy toolbox v2.0 (Eickhoff et al., 2005) and manually checked using the AAL, Tzourio-Mazoyer, and Brodmann atlases. The main contrasts of interest were the differences between age groups in absolute connec- tivity during the task condition—ignoring the fixation epochs—as tested by a two-sample t test for each ROI. Results from a simple linear association in FC studies can lead to misleading interpretations (Ferreira et al., 2016; Geerligs & Henson, 2016; Song et al., 2012). For exam- ple, “increases” in FC may reflect both an increase in the magnitude of a positive correlation or a loss of anticorrelation. To distinguish between processes and support interpretation, within- group mean connectivity maps during the task were thus extracted. The second aim of the study was to investigate how the age effect on FC varies as a function of task demand. The condition (low vs. high frequency) by group (older vs. younger adults) interaction was tested. A 2 × 2 mixed ANOVA between age group and frequency level was computed for each ROI. We were interested in the main effect of condition. The simple main effect of complex- ity in each group (paired t test) and mean within-group FC at each frequency level were explored for every significant interaction to support description and interpretation of the interaction. RESULTS Behavioral Results Mean behavioral performance metrics (accuracy and RTs) were first compared between groups using an ANOVA. Interaction effects were tested by comparing accuracy scores and RTs in each lexical frequency condition for younger and older individuals. The hypothesis regarding both accuracy and reaction times were verified, and although frequency did interact with RT, no main effect of frequency on accuracy scores was observed. As expected, younger (mean = 44.67, SD = 7.69) and older (mean = 43.50, SD = 7.93) adults did not differ significantly in their total BNT accuracy scores (F[1,63] = 0.005, p = 0.946), neither in the high-frequency (F[1,63] = 1.13, p = 0.292) nor in the low-frequency (F[1,63] = 0.89, p = 0.347) condition. Neurobiology of Language 168 l D o w n o a d e d f r o m h t t p : / / d i r e c t . m i t . e d u n o / l / l a r t i c e - p d f / / / / 1 2 1 6 1 1 8 6 7 6 9 1 n o _ a _ 0 0 0 0 7 p d . / l f b y g u e s t t o n 0 7 S e p e m b e r 2 0 2 3 Naming functional connectivity in aging There was a significant difference in the overall mean RT of younger (mean = 1284.24, SD = 189.37) and older (mean = 1417.34, SD = 208.41) adults (F[1,63] = 5.74, p = 0.005). The inter- action between age group and word frequency was significant on RT (F[1,63]= 5.74, p=0.005), and when tested individually, interaction between age and RT is significant for the low frequency (F[1,63]= 10.16, p=0.002) but not the high frequency (F[1,63]= 3.037 p=0.086) condition, show- ing that older adults were significantly slower to answer in the more difficult condition. Identification of the Task-Induced Regions of Interest The thresholded map of the union of both age groups in the naming versus fixation contrast was used to determine peaks of activation in the task-related network. As expected, the nam- ing contrast activated an extensive bilateral occipital-temporal-parietal-frontal circuit in both younger and older adults. The maps of the two age groups were, for the most part, similar (Figure 1). The only significant difference was found in the older > younger contrast in the
right inferior cerebellum lobule VIII (MNI: 27 −54 −46). This cluster was encompassed in a
more massive occipital cluster in the union activation maps, so it was not selected as a distinct
seed in FC analysis.

The task-induced statistical parametric map was composed of 13 clusters. The ROI-to-ROI
analysis revealed that these clusters belonged to five distinct functional clusters: A visual occip-
ital cluster, a sensorimotor cluster, a left frontoparietal cluster, a frontal anterior cluster, and a
posterior superior temporal gyrus (STG) cluster. The seeds that presented the best spatial overlap
and the most similar functional response to each canonical network were the left occipital, 左边
premotor cortex, left orbital IFG, left opercular IFG, and left posterior superior temporal gyrus.

MNI coordinates for the task-induced activation peaks, along with the NBS functional hi-

erarchical clustering statistics, are presented in Table 2.

One additional ROI was selected in the PCC from among the CONN network ROI list to
represent the DMN (MNI coordinates: x = 1 y = −61 z = 38). 数字 1 illustrates the method
and results of selecting the seed ROIs.

Age-Related Differences in Functional Connectivity

The main goal of this study was to assess and describe age-related differences in task-induced
FC in the regions activated during the naming task.

The effect of age on FC topography during task completion was investigated using a seed-
to-voxel FC for each selected ROI for the task and the PCC (t test between two independent
样品). The mean within-group FC was also computed to better characterize the differences
in topological FC organization. Results are reported with a voxel-level height threshold (p < .001 uncorrected) and a cluster extent threshold (p < .05 FWE corrected) and illustrated in Figure 2. The mean and group difference maps for all other activation peaks are available in Supporting Information 1. Based on previous reports of enhanced differences in FC architecture during a task, older adults were expected to show significant differences in the integration of both the task and default mode networks: decreased FC within the DMN, but increased FC within regions out- side the DMN, as well as increased FC in the task-activated regions with semantic and/or ex- ecutive control regions. The results only partially validated the initial expectations. The task-induced FC architecture presented many similarities between age groups. Although small, significant clusters of age-related differences were nonetheless present for each ROI of the task and the DMN. Both increases and decreases were observed with aging. Neurobiology of Language 169 l D o w n o a d e d f r o m h t t p : / / d i r e c t . m i t . e d u n o / l / l a r t i c e - p d f / / / / 1 2 1 6 1 1 8 6 7 6 9 1 n o _ a _ 0 0 0 0 7 p d . / l f b y g u e s t t o n 0 7 S e p e m b e r 2 0 2 3 Naming functional connectivity in aging l D o w n o a d e d f r o m h t t p : / / d i r e c t . m i t . e d u n o / l / l a r t i c e - p d f / / / / 1 2 1 6 1 1 8 6 7 6 9 1 n o _ a _ 0 0 0 0 7 p d / . l Figure 1. Task-induced seed definition: Task-induced activation maps of younger and older adults, ROI functional hierarchical clustering, and selected seeds. Above: activation clusters in the main contrast of interest (task > 休息) for both younger (黄色) 和更老的 (in cyan)
adults. Overlaps (绿色) are observed between younger and older adults in the task contrast. Slice numbers are indicated on the sagittal axis.
以下: Functional hierarchical clustering of the ROI spheres for the task-induced activation peaks. 这 13 activation peaks belonged to five
functional clusters. The most relevant activation peaks are indicated in bright yellow. 例如, the left STG shows the largest number of
connections with all other ROIs. Each colored connection (magenta, 蓝色的, 绿色的, orange) represent the distinct clusters, whereas the width and
opacity are proportional to stats, with the most opaque and greatest width representing the highest connection between regions in each group-
英. ROI = region of interest; STG = superior temporal gyrus; premotor = premotor cortex; PMA = primary motor area; occ = occipital lobe;
orIFG = orbital inferior frontal gyrus; opIFG = opercular IFG; MTG = middle temporal gyrus; SPL = superior parietal lobule. L = left; R = right.

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Sensorimotor regions within the frontal lobe also exhibited FC increases. In older adults, 这
left primary motor cortex showed an age-related enlargement of ipsilateral connectivity sur-
rounding frontoparietal motor areas (dorsolateral prefrontal cortex, middle frontal gyrus, 和
caudate nucleus).

Anterior frontal regions (IE。, the orbital IFG) mainly exhibited age-related FC increases in

portions of the left dorsal striatum (caudate and putamen).

相比之下, there were decreases in the coupling between canonical anterior and posterior
language regions: the left posterior STG ( Wernicke’s area) with the temporal-frontal junction
(temporal pole, inferior frontal orbital cortex, frontal pole, and pars triangularis); as well as the

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Naming functional connectivity in aging

桌子 2. Task-induced seed definition

Activation Analysis

NBS Hierarchical Clustering Analysis

MNI coordinates of
peak activation (毫米)
z
y
X
−12
−72
−40

Anatomical region
Left occipital lobe

Right occipital lobe

Left posterior superior temporal

gyrus

27

−60

Right posterior superior temporal

50

gyrus

Right middle temporal gyrus

Left opercular inferior frontal

gyrus

Left superior parietal lobule

Left orbital inferior frontal

gyrus

54

−38

−22

−30

−80

−39

−34

−24

6

−66

26

Right orbital inferior frontal

33

27

gyrus

Right insula

Left primary motor area

Right primary motor area

Left premotor cortex

34

−44

50

−60

18

−12

−4

2

Cluster
尺寸
7118

6920

65

70

126

94

159

336

81

49

249

242

133

T peak
价值
9

7

12

9

10

10

8

11

10

9

12

11

8

F(56)
35.1

35.8

38.8

39.0

30.7

30.1

14.0

38.8

32.2

18.0

54.9

47.3

27.3

尺寸
9

Visual

Posterior superior

temporal gyrus

Fronto-parietal

Frontal anterior

Sensorimotor

7

12

9

10

10

8

11

10

9

12

11

8

−10

6

8

−2

30

36

2

−2

8

36

39

21

Bold characters show the activation peaks selected as seeds, the most functionally relevant to the corresponding canonical functional network.

left opIFG (Broca’s area) with the posterior inferior temporal regions (fusiform gyrus). The left
visual occipital regions also showed decreased interaction with the occipital pole and superior
frontal regions.

As anticipated, the DMN showed marked age-related differences in FC. There was de-
creased coupling between the PCC and frontal portions of the DMN (medial prefrontal cortex,
bilateral paracingulate cortex, bilateral middle and superior frontal gyrus, bilateral superior
parietal lobule). 反过来, connectivity increased with nearby posterior regions, 大多数
which do not correspond to the traditional description of the DMN (angular gyrus, supramar-
ginal gyrus, superior lateral occipital cortex, superior parietal lobule).

数字 2 and Supplementary Material 1, illustrate a general trend, across both DMN and
task-induced ROIs, for reduced long-range and increased short-range connectivity in older
adults. 例如, the left superior parietal lobule seed mainly exhibited age-related in-
creases in FC with surrounding parietal and medial regions (dorsal striatum) but decreases
with distant frontal and temporal areas. 相似地, the PCC showed increased coupling with
posterior parietal regions but reduced coupling with frontal (medial and lateral) regions in
老年人.

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Naming functional connectivity in aging

These patterns of differences in the regions activated by the task tend to confirm that young
and older adults rely on different neurofunctional and cognitive processes to perform the
word-production task.

The Impact of Lexical Frequency on Age-Related Differences in FC

The final goal of this study was to test whether there was a group difference when manipulating
lexical frequency as an example of a task-specific requirement in a naming task (a condition-
by-group interaction). Within-group statistical maps of between-condition contrasts and mean
FC within age group for each lexical frequency level were computed to support the description
and interpretation of the interaction.

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数字 2. Age-related differences in functional connectivity. Spatial maps show the seed-based con-
nectivity of six most representative ROIs activated by the task, in addition to the default mode net-
工作. For each ROI (yellow sphere) the mean functional connectivity maps are presented for the older
团体, the younger group, and the difference between age groups (OA > YA). 例如, 较老的
adults showed decreased coupling between the left posterior STG and the anterior IFG-insula region,
compared with younger adults. ROI = region of interest; OA = older adult; YA = young adult; IFG =
inferior frontal gyrus; opIFG = opercular inferior frontal gyrus; orIFG = orbital inferior frontal gyrus;
occ = occipital lobe; STG = superior temporal gyrus; PCC = posterior cingulate cortex. L = left.

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Naming functional connectivity in aging

The manipulation of lexical frequency yielded a significant age-by-condition interaction for
the left occipital ROI only. Contradicting the initial expectation, there was no systematic ev-
idence of greater differences between conditions in FC in older adults than in young adults.

A simple main-effects analysis indicated double dissociations in each significant effect. 作为
预期的, older adults showed increased FC with lower lexical frequency (the more challeng-
ing condition). Young adults, on the contrary, showed anti-correlated FC between each pair of
regions in the same condition (数字 3).

The left occipital ROI showed a significant interaction in coupling with the right posterior
inferior temporal gyrus/fusiform gyrus and the right superior cerebellum. As can be seen in
Supplementary Figure 1, the right insula, which was not selected as one of the most represen-
tative seeds, also exhibited an increase in FC with the right inferior cerebellum (I and VI). 为了
后者, although the age-by-condition interaction was significant, it did not reach statistical
significance at the within-group level (main effect of condition in each group).

讨论

This study proposed a structured exploration of the FC characteristics revealed in healthy older
adults during picture naming, a cognitive ability that is central to human functioning and widely
used in clinical cognitive assessments. Most previous FC studies used the resting state to exam-
ine cognitive activity. 然而, it was felt that task-induced FC is better adapted to describe
possible changes in FC that are specific to the cognitive activity. By using seed-based FC during
picture naming, while regressing the task effect and carefully controlling for major confounds,

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数字 3.
Interaction between age and lexical frequency: Spatial maps and mean FC values of
interaction between age and lexical frequency on task-induced FC. Spatial maps (on the left) 展示
the significant interaction effect, FWE thresholded. Bars and whiskers on the right denote FC effect
size for each group (younger and older adults) in each condition (high and low lexical frequency).
Across-group differences in FC effect sizes are given above the bars. FC = functional connectivity;
FWE = family-wise error; occ = occipital lobe; ITG = ; L = left; R = right.

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Naming functional connectivity in aging

this study confirms some of the initial hypotheses but also expands upon prior knowledge sur-
rounding word production in aging.

In brief, the results show that, although the brain topography of picture naming is very similar
in younger and older adults, the FC architecture underlying naming exhibits significant differ-
恩塞斯. In older adults, there is less coupling of the traditionally described core structures of
language acquisition (例如, Broca’s and Wernicke’s areas), along with enhanced FC in regions
involved in both semantic retrieval and motor control. This study also provides the first evi-
dence that intrinsic task psychometric characteristics (IE。, lexical frequency) do not interact
much with the age-FC relationship. 一起, the findings confirm the mutual interest of
task-induced FC over a resting-state paradigm to study brain organization in healthy aging.

A Common Naming Activation Network

By choosing a sample- and task-specific template, this study proposed a neurofunctional ex-
ploration as similar as possible to the actual cognitive activity (Dickie et al., 2017; Geerligs
等人。, 2017; Salehi et al., 2018; Salehi, Karbasi, Scheinost, & Constable, 2017). As anticipated,
the brain activation analysis yielded a large fronto-temporo-occipital network of higher activity
during naming. This statistical parametric map is in line with the most prominent model of
word processing (Hickok & Poeppel, 2007). Typical ventral semantic and dorsal phonological
streams were revealed by brain activation studies (Baciu et al., 2016; Price, 2012) and brain
stimulation mapping (Duffau et al., 2014) in younger adults, and these findings were replicated
in studies of FC in aging (Hoyau et al., 2018; Indefrey, 2011). 而且, the activation peaks
were spatially and functionally coherent with the canonical functional networks that could be
expected to be active during a naming task, such as the visual, sensorimotor, salience, 和
anterior and posterior language networks.

The task-related network involved the same regions across age groups, except for the right
inferior cerebellum, which was more active in older than in younger adults. It is now recog-
nized that the cerebellum is engaged in the processing of complex cognitive material (Bernard
& Seidler, 2014; Keren-Happuch, 陈, Ho, & 德斯蒙德, 2014; Stoodley, Valera, &
Schmahmann, 2012). 尤其, the right inferior cerebellum lobule VIII has been described
as the “sensorimotor cerebellum” because it is involved in overt motor processing (articula-
的) and phonological storage (陈 & 德斯蒙德, 2005). This may suggest increased phono-
logical activity in older adults.

Some studies of word production previously reported increases in BOLD signals in parietal,
frontal, or temporal regions with age (例如, Hoyau et al., 2017; Meunier et al., 2014), 也
contralateral recruitment (例如, La et al., 2016; Meinzer et al., 2012), to support performance. A
recent meta-analysis focusing on semantic cognition and aging (Hoffman & Morcom, 2018)
concluded that increased activation was principally observed when older adults performed
worse than younger ones, 例如, during tasks drawing on executive functions. 虽然
examples of difficulties during naming are common in the literature (Feyereisen, 1997; Goulet
等人。, 1994; Shafto et al., 2017), mean accuracy is generally preserved in our study, in line with
previous reports that examined accuracy with untimed tasks (LaBarge et al., 1986; Salthouse,
2014; Schmitter-Edgecombe et al., 2000; Verhaegen & Poncelet, 2013; Wierenga et al., 2008).
In the context of preserved cognitive performance, 然后, the absence of such “compensatory” ac-
tivity is not surprising. It should be mentioned that word production is not systematically preserved
with age (伯克 & Shafto, 2004) 和, although the causes are still under study (Facal, Juncos-
Rabadán, Rodríguez, & Pereiro, 2012; 施瓦茨 & 弗雷泽, 2005; Shafto, 伯克, Stamatakis,
Tam, & Tyler, 2007), the impact of task demand will require further investigation.

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Naming functional connectivity in aging

Age-Related Functional Connectivity Differences

The main question raised in this study was whether there were differences in the FC architec-
ture during word production between younger and older healthy adults. 全面的, a common
FC architecture is observed across age groups during the task. Small yet significant, and po-
tentially functionally meaningful, differences were observed: Both increases and decreases
were seen in task-activated regions as well as in the DMN.

第一的, there is a general tendency for older adults to reduce long-range and increase short-
range connectivity. This pattern may play a functional role and reflect the need for more local
processing of neuronal information with age, at the expense of long-distance connectivity (看
Sala-Llonch et al., 2015, for a review), in line with the idea that functional organization be-
comes more segregated with age (Cao et al., 2014; 费雷拉 & Busatto, 2013; Tomasi &
Volkow, 2012). 或者, this pattern may be an unfortunate consequence of head move-
蒙特 (力量, 施拉加尔, & 彼得森, 2015; Van Dijk, 肥皂, & 巴克纳, 2012). 虽然
overt naming is deemed to be similar to natural/clinical conditions, it does induce consider-
able task-related motion. Even though many precautionary and corrective measures were taken
during the acquisition and preprocessing steps, some task-related movement remains. No stan-
dard procedure has yet been shown to unequivocally eliminate the confounding factor of
movement (巴克纳, 克里宁, & 杨, 2013); 然而, scrubbing—as used in this study—is
an efficient method of reducing related artifacts (力量, 巴恩斯, 斯奈德, 施拉加尔, &
彼得森, 2012; Yan et al., 2013). Further investigation in various task contexts and a better
comprehension of the many structural, molecular, or physiological changes that occur in
healthy aging will be required to determine which interpretation is most valid.

Functional Connectivity Differences in Task-Activated Regions

Earlier studies of FC in aging generally reported expansion of the system involved in word
processing at a younger age (Agarwal et al., 2016; Hoyau et al., 2018; La et al., 2016;
Marsolais et al., 2014). Our results suggest that older adults use similar circuits but also rely
on multiple different mechanisms during task performance.

第一的, the connectivity of the task-activated regions decreases along a fronto-temporo-
occipital pathway (IFG and posterior STG, posterior occipital, and superior frontal gyrus), rem-
iniscent of the semantic ventral stream traditionally described in younger adults (Duffau, 2015;
Hickok & Poeppel, 2007). Although frontotemporal connections have long been considered
crucial for word production, findings emerging from brain surgery, stimulation, and multi-
modal imagery in young adults suggest that their role is multimodal rather than specific
(Binder, Desai, 格雷夫斯, & Conant, 2009; Chao, Haxby, & 马丁, 1999; Duffau, 2015; Etard
等人。, 2000; Simons, Koutstaal, 王子, 瓦格纳, & Schacter, 2003; Tyler, 张, Devereux,
& 克拉克, 2013). Inferior-frontal to posterior-temporal connections—which show less coacti-
vation in older adults—are, 例如, involved during tasks that require high semantic con-
控制 (Duffau, 2015). This finding is in line with accumulated evidence that older adults rely less
on executive control—and more on semantic retrieval—when performing a word production
任务, as demonstrated using univariate activation analysis (Ansado, Marsolais, Methqal, Alary,
& Joanette, 2013; Baciu et al., 2016; Diaz, Rizio, & Zhuang, 2016; Hoyau et al., 2017;
Lacombe, Jolicoeur, Grimault, Pineault, & Joubert, 2015; Marsolais et al., 2014; Methqal,
Marsolais, Wilson, Monchi, & Joanette, 2019) and dynamic FC (Hoyau et al., 2018).
一起, these findings suggest that older adults depend less than younger adults on seman-
tic control abilities to perform the picture-naming task and possibly rely on automatized pro-
cesses instead.

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Naming functional connectivity in aging

A decrease in frontoparietal coupling (right insula, supramarginal gyrus, and parietal
operculum) is in line with earlier assertions that increased FC in domain-general systems
is not required for everyday language functioning (坎贝尔 & Tyler, 2018) and contrasts
with the general expectation that decreased resource allocation is a characteristic of aging
(公园 & Reuter-Lorenz, 2009). The insula and the supramarginal gyrus are structurally con-
nected (Ghaziri et al., 2017) and are part of control networks that guide directed attention
(Dosenbach et al., 2007; Menon & Uddin, 2010; Seeley et al., 2007; Zabelina & Andrews-
Hanna, 2016). Their deactivation during speech was previously associated with top-down
regulation of auditory attention, like that induced in a noisy environment (Elmer, 迈耶,
Marrama, & Jäncke, 2011), possibly to maximize the somatosensory feedback when speech
production becomes error-prone (Golfinopoulos et al., 2011; Seghier et al., 2015).

最后, another striking and unanticipated age-related feature is the tendency for in-
creased coupling of functional brain activity within and between motor regions responsible
for higher-level phonological processing—for example, significant increases in surrounding
ipsilateral activity in the frontal motor regions in charge of articulation control and initia-
的, such as the left dorsolateral frontal cortex and middle frontal gyrus (Duffau, 2015;
Guenther, 2016; 明智的, Greene, Büchel, & 斯科特, 1999). The pattern is coherent with pre-
viously described indirect connectivity along the dorsal phonological stream between the
primary motor and the opercula IFG (Broca’s area) via the premotor cortex (马古利斯,
Böttger, Watanabe, & Gorgolewski, 2013). The primary motor cortex also shows increased
coupling with the caudate nucleus, which plays a role in the control of articulation
(Argyropoulos, Tremblay, & 小的, 2013; Duffau et al., 2014; Guenther, 2016; 马古利斯
等人。, 2013; Tremblay, Deschamps, & Gracco, 2016). In summation, more functional re-
organization and less segregation can be seen along the dorsal phonological stream with
increased age (Agarwal et al., 2016; Diaz et al., 2016; 马丁斯, Simard, & Monchi, 2014;
Muller et al., 2016; Sörös, Bose, Sokoloff, Graham, & 愚蠢的, 2011), in line with the hypoth-
esized weakening of the links between phonological and lexical representations (伯克
等人。, 1991).

Functional Connectivity Differences in the DMN

In accordance with previous reports, the DMN showed an age-related increase with other pa-
rietal regions during the task (Chan et al., 2017; Geerligs et al., 2014; Grady et al., 2016; Mak
等人。, 2017; Spreng, Stevens, Viviano, & Schacter, 2017). This kind of mechanism has been
suggested to indicate a broad dedifferentiation of neural activity in later life (例如, 坎贝尔,
Grady, 的, & Hasher, 2012). 或者, the interaction between the DMN and task com-
ponents may indicate active strategic cognitive processes. According to the default-executive
coupling hypothesis of aging (DECHA) 模型 (车工 & Spreng, 2015), aging is characterized
by a semanticization process: As cognitive control resources decline, cognitive behavior be-
comes more and more influenced by past experiences and knowledge. The DMN therefore
becomes increasingly engaged with task components to support task performance. 虽然
Turner and Spreng specifically described increases in DMN-prefrontal lateral coupling, 他们
used cognitive tasks that rely partly on executive processes. 实际上, the increase in DMN ac-
tivity has also been demonstrated with other regions (Damoiseaux et al., 2008; Sambataro
等人。, 2010) and the DECHA might therefore be extended to any region involved in the task
in relation to the posterior DMN. The posterior DMN has been specifically described as a key
actor in semantic retrieval processes, 事实上, the DMN and the semantic system share an
overlapping functional network (Binder et al., 2009; Bonnelle et al., 2012; Krieger-Redwood
等人。, 2016).

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Naming functional connectivity in aging

The Impact of Lexical Frequency Manipulation

Behavioral analysis showed that there is an interaction between age, 频率, and RT, 哪个
suggests that lower frequency does make the cognitive activity more demanding for older
adults, even though they still manage to accomplish the task. Lexical frequency did not influ-
ence accuracy scores in either age group. More segregated frequency levels may have allowed
for a stronger task-demand effect (Moberg, 费拉罗, & Petros, 2000), and more robust conclu-
sions will require the manipulation of task demands through more than two levels.

Although exploratory, our results show a few regions that are significantly mediated by in-
trinsic task requirement according to age. With greater task demand, integration increases in
老年人, whereas it decreases in young adults. Previous studies with other types of task
load interpreted this pattern as an adaptive form of compensation, beneficial to performance
(例如, Crowell et al., 2019; Nagels et al., 2012; 车工 & Spreng, 2015). Those studies, 和
others that presented age-related compensation patterns (Cabeza, 2002; Campbell et al.,
2012; Grady et al., 2016; Morcom & Henson, 2018; 公园 & Reuter-Lorenz, 2009; Rajah &
D’Esposito, 2005; 车工 & Spreng, 2015), advocated for the notion that there are domain-
general mechanisms, expressed mostly through increased activity in prefrontal regions. 这
hypothesis builds upon the underlying assumption that older adults find just about any task
more difficult than young adults, because of a general cognitive decline (Craik & Byrd,
1982). 然而, domain-general upregulation was mostly reported using tasks that represent
a strong cognitive challenge for older adults (Hoffman & Morcom, 2018). To our knowledge,
only one other study previously explored the impact of linguistic criteria on verbal fluency
(Marsolais et al., 2014); it showed an interaction between age and increased FC in posterior
地区. Using an intrinsic—linguistic—task demand, rather than general cognitive load, 我们的
findings are also in line with the concept of task-specific mechanisms (坎贝尔 & Schacter,
2016; 坎贝尔 & Tyler, 2018; Hearne, Cocchi, 扎莱斯基, & Mattingley, 2017; Peelle, 2019;
Samu et al., 2017). Campbell and Tyler (2018) suggested that domain-general networks should
not be considered as stable, singular mechanisms. 因此, neurofunctional patterns invoked
during a task may instead reflect processes that are specific to that task.

In this study, age differences between conditions are small in both size and number.
此外, the FC of the DMN was not significantly affected by lower lexical frequency,
contrary to what had been reported previously in studies that manipulated executive task de-
要求 (Persson et al., 2007; Steffener, Habeck, & Stern, 2012). 反而, the interaction was
significant in regions that are functionally meaningful and specialized for the task: the left oc-
cipital cortex and fusiform gyrus, which together encode visual representations of objects
(Mahon et al., 2007; 马丁 & Chao, 2001); the fusiform gyrus, the cerebellum, and the insula,
which were previously reported to be active during the processing of low-frequency words
(Basso et al., 2013); 和, as mentioned earlier, the right inferior cerebellum lobule VIII, 哪个
is also related to phonological production (陈 & 德斯蒙德, 2005).

Greater insight into domain-general and task-specific mechanisms will be gained by large
data set studies that manipulate various cognitive states, such as those initiated by projects
such as Reference Ability Neural Network study (Stern et al., 2014) and Cambridge Centre
for Ageing and Neuroscience, or CamCAN (Taylor et al., 2015).

最后, some general methodological considerations should be raised regarding the diffi-
culty of interpreting the neurobiological meaning of linear FC changes in group comparisons.
Increased FC could either indicate decreased network adaptability to task demands (Avelar-
Pereira et al., 2017; 坎贝尔 & Schacter, 2016; Dixon et al., 2017; Dubois & Adolphs, 2016;
Geerligs et al., 2015; Grady et al., 2016) or reflect optimization for efficient (IE。, 小的)

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Naming functional connectivity in aging

network updates, reducing processing demands and supporting behavioral performance
(Schultz & Cole, 2016; Shine et al., 2016). Although this study was not designed to rule on
these options, the latter fits the current findings better: Considering the preservation of perfor-
曼斯, and the tendency for the core naming network to shrink and for the dorsal phonolog-
ical stream to suffer more from the impact of age, FC topography differences could indicate an
efficient strategy relying on a more experienced, automatized, and specialized circuit in older
adults. 或者, interindividual heterogeneity should not be underestimated: The intricate
patterns emerging from averaged differences between groups could reflect more diverse brain
physiology and functioning among older people, as has been reported frequently (例如, Amiri
等人。, 2014; Dong et al., 2012; Raz et al., 2005; Zuo et al., 2010). 此外, the task effect
was regressed in this study, because this technique had previously been demonstrated to in-
crease the reliability of task FC estimates (Cao et al., 2014; Cole, Bassett, 力量, Braver, &
彼得森, 2014). This choice may have reduced some of the true task-related effects on
FC but was felt to be preferable considering the overt nature of the naming task and knowing
that participant movement can have large effects on FC estimates (Mowinckel, Espeseth, &
Westlye, 2012).

结论

This study was designed to characterize the possible age-related reorganization of functional
connectivity associated with a word-naming task, while manipulating task demand using the
lexical frequency of the stimuli.

Word production is a basic yet essential cognitive activity central to human everyday function-
英. This study, like others before it, emphasizes that vocabulary knowledge increases throughout
the life span, into the later stages of life, even though word-production processes slow down.

在此背景下, the task-induced functional architecture of older adults, compared with
younger adults, is characterized by greater reliance on regions in charge of motor control
地区, along with lesser inclusion of regions classically associated with word production, 这样的
as the IFG and the posterior STG. Earlier descriptions of the core word-production network
were based mostly on samples of young adults and used resting-state paradigms. This study,
using a sample- and task-specific design, suggests that older adults have a more efficient strat-
egy, relying on a more experienced, specialized, and segregated, naming pathway.

This study also reinforces the notion that task-specific rather than domain-general mecha-
nisms apply in older adults. Although additional involvement of frontal and bilateral executive
regions was previously suggested to support the cognitive performance of older adults in every
domain, it appears that those findings cannot be generalized to all cognitive states or types of
task demand. 反而, older adults rely on highly specialized regions to perform more complex
linguistic processes.

Considering the current limitations affecting the interpretation of FC changes with age, fur-
ther exploration is definitely required to disentangle the complex interplay between preserved
performance and neurofunctional behavior, using various tasks and stimuli.

资金信息

Yves Joanette, Institute of Aging (http://dx.doi.org/10.13039/501100000026), 奖项ID: 191272.
Simona Maria Brambati, Canadian Network for Research and Innovation in Machining
技术, Natural Sciences and Engineering Research Council of Canada (http://dx.doi.
org/10.13039/501100002790).

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Naming functional connectivity in aging

作者贡献

Julien Jarret: 数据管理: 平等的. Simona Maria Brambati: 概念化: 配套;
方法: 配套; Writing — Review & Editing: 配套. Pierre Bellec:
方法: 配套; 监督: 配套; Writing — Review & Editing: 配套.
Yves Joanette: 概念化: 配套; 资金获取: 带领; 项目管理:
平等的; 资源: 带领; 监督: 配套; Writing — Review & Editing: 配套.

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