Patterns of Brain Activity Supporting Autobiographical - IA de Investigación especializada en el MIT

Patrones de actividad cerebral que respaldan lo autobiográfico
Memoria, Prospection, and Theory of Mind, y
Their Relationship to the Default Mode Network

R. Nathan Spreng1 and Cheryl L. Grady1,2

Abstracto

■ The ability to rise above the present environment and reflect
upon the past, the future, and the minds of others is a fundamen-
tally defining human feature. It has been proposed that these
three self-referential processes involve a highly interconnected
core set of brain structures known as the default mode network
(DMN). The DMN appears to be active when individuals are en-
gaged in stimulus-independent thought. This network is a likely
candidate for supporting multiple processes, but this idea has
not been tested directly. We used fMRI to examine brain activity
during autobiographical remembering, prospection, and theory-

of-mind reasoning. Using multivariate analyses, we found a com-
mon pattern of neural activation underlying all three processes in
the DMN. Además, autobiographical remembering and pros-
pection engaged midline DMN structures to a greater degree
and theory-of-mind reasoning engaged lateral DMN areas. A func-
tional connectivity analysis revealed that activity of a critical node
in the DMN, medial prefrontal cortex, was correlated with activity
in other regions in the DMN during all three tasks. We conclude
that the DMN supports common aspects of these cognitive behav-
iors involved in simulating an internalized experience. ■

INTRODUCCIÓN
Remembering oneʼs past (memoria autobiográfica),
imagining oneʼs future (prospection), and imagining
the thoughts and feelings of others (theory of mind) son
similar in that they all involve simulating an experience
that is distinct from stimulus-driven behavior (Buckner &
Carroll, 2007). Two domains, memoria autobiográfica
and prospection, have shown substantial behavioral and
neural overlap. They are correlated in their phenomeno-
logical detail (DʼArgembeau & Van der Linden, 2004) y
temporal distribution (Spreng & Levin, 2006). Más-
más, they appear to share a common set of active brain
areas (Addis, Wong, & Schacter, 2007; Szpunar, watson, &
McDermott, 2007; Okuda et al., 2003). Focal lesions to the
medial-temporal lobes have resulted in co-occurring defi-
cits in memory and imagining novel scenarios (Hassabis,
Kumaran, Vann, & Maguire, 2007; Tulving, 1985).

Autobiographical memory, prospection, and theory of
mind are also interrelated (Perner, 2000; Suddendorf &
Corballis, 1997). Simulation-based accounts of theory-
of-mind resemble the process of remembering oneʼs past
and imagining oneʼs future. Theory-of-mind reasoning
can involve imagining the mindset of others and simulat-
ing their experience in order to understand their internal
estados (Blakemore & Decety, 2001). In all three instances,
the individual must recreate an experience outside of
their personal present moment (Buckner & Carroll,

1Rotman Research Institute at Baycrest, toronto, ontario, Canada,
2universidad de toronto, ontario, Canada

2007). This trio of abilities emerges at the same time de-
velopmentally, at about 3.5 years of age (Perner, Kloo, &
Gornik, 2007; Suddendorf, 1999). Autobiographical
memory and theory of mind are not necessarily mutually
dependent in adults, sin embargo, as shown in two patients
with retrograde amnesia who performed well on theory-
of-mind tasks (Rosenbaum, Estúpido, Levin, & Tulving,
2007). Sin embargo, a quantitative summary of multiple
independent observations has found substantial neural
overlap between these three cognitive domains (Spreng,
Mar, & kim, 2009). Hasta la fecha, no study has directly tested
the idea of common neural underpinnings for autobio-
graphical memory, prospection, and theory-of-mind rea-
soning within the same individuals.

There is evidence of overlap between the functional
neuroanatomy of these domains and that of the default
mode network (DMN; Spreng et al., 2009; Buckner &
Carroll, 2007). The DMN is an intrinsically organized core
set of brain regions observed to be more metabolically ac-
tive at “rest.” The network includes midline frontal and
parietal structures, medial and lateral temporal lobes, y
lateral parietal cortex (Buckner, Andrews-Hanna, & Schacter,
2008; Mazoyer et al., 2001; Raichle et al., 2001; Shulman
et al., 1997). Behaviorally, the DMN may underlie stimulus-
independent thought (McGuire, Paulesu, Frackowiak, &
Frith, 1996). Self- and other-attribution judgments have
been associated with medial prefrontal cortex (MPFC) ac-
actividad (mitchell, Banaji, & Macrae, 2005; Gusnard, Akbudak,
Shulman, & Raichle, 2001), a reliable node of the DMN.
Por lo tanto, the process of projecting the self into the past,

Revista de neurociencia cognitiva 22:6, páginas. 1112–1123

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the future, or into the minds of others may all rely on the
DMN (Buckner et al., 2008; Buckner & Carroll, 2007). A
separate network of regions that is “anticorrelated” to
the DMN appears to be related to stimulus-driven atten-
tion that is common with many cognitive tasks. This net-
work is typically referred to as the task-positive network
(Fox et al., 2005). These two networks account for large-
scale patterns of covariance across hundreds of neuro-
imaging studies (Toro, Fox, & Paus, 2008).

En el presente estudio, we tested the hypothesis that
adults who are engaged in autobiographical remember-
En g, prospection, and theory-of-mind reasoning would
activate the same set of brain regions across all three
condiciones. This hypothesis is consistent with the idea
that the DMN mediates these processes. We used a multi-
variate method of analysis known as partial least squares
(PLS) to identify where activity covaried across the three
experimental conditions in the entire brain, and to see
if this pattern was consistent with the DMN. To provide
additional evidence that the DMN, and not the task-
positive network, was engaged across the task conditions,
we conducted a functional connectivity analysis of brain
regions known to be part of these networks (Fox et al.,
2005). We did so by examining the correlations of the
DMN and task-positive seed regions across the three
experimental conditions and the rest of the brain.

MÉTODOS

Participantes

fMRI scans of 16 participantes sanos (edad media = 25.9 años,
DE = 4.0; 5 hombres; 1 left-handed) were acquired while
they engaged in cued autobiographical remembering,
prospection, and theory-of-mind reasoning. Participantes
had normal or corrected-to-normal vision and no history
of neurological or psychiatric illness. Years of education
averaged 18.0 años (DE = 1.8). Participants gave written
informed consent before inclusion in the study, which was
approved by the ethics committee of Baycrest Centre.

Stimuli and Procedure

The study comprised three experimental conditions and
a sensorimotor control condition. In the experimental
condiciones, participants engaged in cued autobiographi-
cal remembering, prospection, and theory-of-mind rea-
expiación. Four 10-min runs, each consisting of 8 trials of
each condition, for a total of 32 trials per condition, eran
presented and counterbalanced across participants. El
study paradigm was designed to match visual input but vary
the task demands.

In all experimental trials, a photograph and associated
word were used as cues and were presented on the
same screen for 4 segundo. El 96 photographs were selected
from the International Affective Picture System (IAPS: Lang,
Bradley, & Cuthbert, 2005). Image valence ranged from

positive to neutral to negative while depicting people in
various situations. By IAPS standards, the range of images
was moderate (without graphic depictions of sex or muti-
lación): pleasure mean = 5.35 (DE = 1.8), arousal mean =
5.29 (DE = 1.5), and dominance mean = 5.36 (DE = 2.0).
Matched for valence, arousal, and dominance, the stimuli
were randomized within and unique to each run and were
counterbalanced across conditions.

Each photograph contained one or more persons, semejante
as a family around a dinner table. Below the photograph, a
related cue word, such as “Family” was displayed. After the
4-sec viewing period, participants were presented with the
instruction screen for 10 segundo. On the instruction screen,
participants were directed to use the photograph and the
word as a cue to remember an event, imagine a future
event or imagine the thoughts and feelings of someone
in the photograph. Por ejemplo: (A) “Remember a time
when you went out with your family” (remembering), (B)
“Imagine a time you will go out with your family” (prospec-
ción), o (C) “Imagine what the father in the picture was
thinking and feeling” (theory-of-mind reasoning). To en-
sure sufficient time for autobiographical memory retrieval,
a 10-sec interval was selected based on electrophysiolog-
ical evidence (c.f. Conway, Pleydell-Pearce, Whitecross, &
Sharpe, 2003). Próximo, participants rated how clearly they
engaged in the recollection or imagining (1 = Very clearly,
2 = Somewhat clearly, 3 = Not clearly at all; ver figura 1).
In the control condition, participants viewed 32 scram-
bled photographs that were meaningless but matched the
experimental photographs for perceptual input. The words
“Control Stimulus” were displayed underneath each image
(cf. Burianova & grady, 2007). This was followed by a but-
ton press instruction (p.ej., “Press the key that corresponds
to the letter ‘P’.”). As in the experimental conditions, re-
sponses were made by pressing 1, 2, o 3 on a keypad
(p.ej., “1 = N, 2 = B, 3 = P”). Responses were recorded
using a fiber-optic response pad placed in the participantsʼ
right hand. One participantʼs responses were not recorded.
All participants went through a three-step training ses-
sion prior to scanning that included instruction, práctica,
and discussion. Training included an instructional conver-
sation about autobiographical events being unique to time
and place, envisaging future scenarios, and imagining the
thoughts and feelings of others. After completing five prac-
tice trials for each condition, participant compliance was
assessed. This included discussing the ability to engage
the task for 8 a 10 segundo, ease of engagement, and making
a clarity judgment at the end of the 10-sec interval. Six par-
ticipants requested to complete another practice run to
clarify what was expected of them. All participants found
the task to be easy and a majority spontaneously reported
it to be enjoyable after the scanning session.

Image Preprocessing and Analysis

Brain imaging data were acquired with a 3.0-T Siemens
scanner with a standard head coil. Anatomical scans

Spreng and Grady

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Cifra 1. Example of an
experimental trial. Participantes
viewed a photograph for 4 segundo.
Próximo, a condition-specific
instruction with three clarity
ratings was displayed for 10 segundo.
The intertrial interval (fixation)
era 2 segundo. In the example,
the question relates to the
future condition. Otro
participants may have seen
the photograph paired in the
memoria autobiográfica
condition with the instruction,
“Remember a time you had
an intimate moment”; o, el
theory-of-mind condition with
the instruction, “Imagine what
the woman was thinking and
feeling.” Each photograph was
presented only once per
partícipe. Photographs were
presented in their original color.

were acquired using a T1-weighted volumetric MRI (TR =
2000 mseg, TE = 2.63 mseg, 160 axial slices, 1.0 mm thick,
FOV = 256 mm). Four runs of BOLD functional scans were
acquired with a T2*-weighted EPI pulse sequence (TR =
2000 mseg, TE = 30 mseg, flip angle = 70°, FOV = 200 mm,
64 × 64 acquisition matrix), consisting of 30 contiguous,
5-mm-thick axial slices.

Images were reconstructed in AFNI (Cox, 1996), dónde
they were first corrected for respiration and heart rate.
Slice-timing was corrected to the first slice; next, movimiento
was corrected using a 3-D Fourier transform interpolation
using a functional volume that minimized the amount of
motion to less than 2 mm. Finalmente, participantsʼ images
were spatially normalized to MNI space and smoothed
using a 6-mm FWHM Gaussian filter in SPM5. El resultado-
ing voxel size was 4 × 4 × 4 mm.

To analyze the fMRI data, we used spatio-temporal PLS,
a multivariate functional neuroimaging analysis tool de-
signed to identify whole-brain patterns of activity that
are correlated with task (McIntosh, Chau, & Protzner,
2004). PLS assessed the covariance between brain voxels
(BOLD signal) and the experimental design to identify a
limited number of components (latent variables, LVs)
that optimally relate the two data matrices. This data-
driven approach was similar to a principal component
analysis and determined whole-brain patterns of activity.
Unlike the standard univariate analysis that examines
the independent activity of any single voxel, PLS is ca-
pable of detecting brain-wide systems that covary with
the experimental design. With PLS, the hemodynamic re-
sponse is not modeled explicitly, in the sense of defining
a canonical response; en cambio, the algorithm determines
the response that best characterizes the conditions of
interés.

When applying PLS analysis to event-related data, el
results provide a set of brain regions that are reliably re-
lated to the task conditions at eight poststimulus TRs
(16 segundo) for each LV (McIntosh et al., 2004). Activity at
each time point for each event was normalized to activity
in the first TR of the trial, defined here as the onset of the
instructions. As we were primarily interested in activity
related to the conditions, and not in stimulus-related
activity to the cue photographs/words per se, we exam-
ined those neuroimages beginning with the instructions
to engage in autobiographical remembering, prospec-
ción, theory-of-mind reasoning, or the control task. El
TRs sampling brain activity during the interval of time
spent viewing the photographs were not included in
the analysis (see Discussion for potential carryover effects
of picture viewing). In PLS, each brain voxel is given a
weight, known as a salience (akin to a component load-
En g). This salience is proportional to the covariance of
activity with the task contrast at each time point on each
LV. Multiplying the salience by the BOLD signal value in
that voxel and summing the product across all voxels
gives a brain score for each participant for each time
point on a given LV (like a component score). Estos
scores can be used to examine differences in brain activ-
ity across conditions, as greater activity in brain areas
with positive (or negative) saliences on an LV will yield
positivo (or negative) mean scores for a given condition
over each time point. The plots of mean brain scores
show the pattern of activity across the brain, expressed
over the 16-sec period, and are analogous to hemody-
namic response functions typically plotted for individual
regiones del cerebro.

The significance of each LV was determined by per-
mutation testing (McIntosh, Bookstein, Haxby, & grady,

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Revista de neurociencia cognitiva

Volumen 22, Número 6

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1996), usando 500 permutations. In a second, independiente
step, the reliability of the saliences for the brain voxels,
characterizing each pattern identified by an LV, was de-
termined by bootstrap resampling to estimate the stan-
dard errors for each voxel (Efron & Tibshirani, 1985).
For each voxel at each TR, the salience/standard error
ratio, or bootstrap ratio (BSR), was calculated and is
roughly equivalent to a Z-score. Peak voxels with a BSR
greater than four were considered reliable and approxi-
mates a p value of 10−4. Clusters containing at least 10
reliable voxels were extracted, and a local maximum for
each cluster was defined as the voxel with a BSR higher
than any other voxel in a 2-cm cube centered on that
voxel. Although most regions showed reliable activations
across multiple time points, results are reported from
the bootstrap ratios for the fourth and fifth TR (es decir., en
8–12 sec after instruction onset) as a representative index
of brain activity in time. In focusing on these early and
middle time points, brain activity associated with clarity
judgments, made at approximately 9 sec after instruction
onset (see Results), would be minimized. Locations of
the maxima are reported in the stereotaxic coordinates
of MNI space.

In order to directly examine task covariance in neural
activity at the voxel level, changes in BOLD signal inten-
sity for each TR were extracted for peak voxels from the
task PLS analysis from the first LV in DMN regions (loca-
tions specified by Buckner et al., 2008, Mesa 1).

A common way of assessing activity in the DMN and in
the task-positive network is to measure resting state
functional connectivity using MPFC and inferior parietal
sulcus (IPS) seed regions, respectivamente (Fox et al.,
2005). In order to test the hypothesis that the three
experimental conditions are associated with the DMN,
and not the task-positive network, we sought to identify
functionally connected networks of brain regions asso-
ciated with the experimental conditions using “seed”
PLS (McIntosh, 1999). Seed PLS correlates activity in a
given region of interest with activity in all other brain
voxels to assess the functional connectivity of this region
and then examines how these correlation patterns differ
across experimental conditions (McIntosh, 1999). Nosotros
evaluated whether seeds in MPFC (0, 52, −16) and IPS
(24, −64, 48) could reinstate the intrinsically organized
default and task-positive networks in a task-related
functional connectivity analysis. The coordinates from
Fox et al. (2005) were transformed from Talairach to
MNI using the Lancaster transformation (Lancaster et al.,
2007). These seeds were selected because the regions
are reliably engaged across conditions (Spreng et al.,
2009; Toro et al., 2008) and functionally connected to the
respective networks at rest (Fox et al., 2005). In seed PLS,
correlation values represent the relationship between
activity in a voxel and the whole-brain pattern identified in
the analysis. We considered any region to be part of either
the DMN or the task-positive network if it was within 2 cm
of the average coordinate from a resting state functional

Mesa 1. Peak Regions Associated with LV1

Location

Hemis BA

Ratio

Past, Future, Other > Control

STS/MTG

Pre-SMA

CAC

RSC

MPFC

MFG

IFG (orbitalis)

Cerebellum

PHC

Putamen

IFG (triangularis)

PCC

MFG

MTG

ITG

IPL

Frontal pole

21 −68 −36 −4

−4

32 −12

−8 −44

9 −12

6 −44

47 −44

36 −12

20 −88 −36

32 −60

NA −20

45 −48

8 −52

21 −64 −12 −16

20 −60 −12 −28

39 −40 −76

10 −12

9.4

8.6

8.0

7.8

7.7

7.4

7.1

6.9

6.7

6.6

6.4

6.3

6.2

6.1

5.9

−4 −48

Control > Past, Future, Otro

MT+

Insula

Thalamus

Paracentral lobule

Cerebellum

Precentral gyrus

Postcentral gyrus

28 −60 −16 −15.3

19 −48 −80

8 −12.5

13 −48

−4 −11.2

20 −28

31 −16 −40

−8 −72 −44

1 −32 −32

−9.3

−6.5

−6.3

−6.0

−5.7

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Clusters reported at TR5 with a minimum of 10 voxels with a BSR
greater than 4. Hemis = hemisphere; L = left; R = right; BA = Brodmannʼs
área; ACC = anterior cingulate cortex; HC = hippocampus; IFG =
inferior frontal gyrus; IPL = inferior parietal lobule; ITG = inferior tem-
poral gyrus; MCC = middle cingulate cortex; MFG = middle frontal gyrus;
MOG = middle occipital gyrus; MPFC = medial prefrontal cortex; MT+ =
ventral occipital cortex; MTG = middle temporal gyrus; PCC = posterior
cingulate cortex; PCu = precuneus; PHC = parahippocampal gyrus;
RSC = retrosplenial cortex; SOG = superior occipital gyrus; SMA = sup-
plementary motor area; SMG = supramarginal gyrus; STS = superior
temporal sulcus. Coordinates are in MNI space.

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connectivity study (Fox et al., 2005) and a large-scale
meta-analysis of coactivation patterns from 792 neuro-
imaging papers (Toro et al., 2008) and within the same neuro-
estructura anatómica (p.ej., posterior cingulate cortex).

Spreng and Grady

1115

RESULTADOS

There were no differences in the proportion of clarity
ratings between the experimental conditions (all ps >
.05). The majority of responses were rated as “very
clearly” (75–78%) followed by “somewhat clearly” (16–
22%). Participants rated a small proportion of responses
(2–5%) as “not clearly at all.” The pattern of brain activity
remained unchanged when the data from responses that
were rated as “not clearly at all” were excluded from the
análisis. Por lo tanto, we included all trials for each condi-
tion in the fMRI analysis. Response times were signifi-
cantly faster for the control condition (mean = 2.9 segundo,
DE = 3.0 segundo) than the autobiographical memory (mean =
9.0 segundo, DE = 1.4 segundo), prospection (mean = 9.4 segundo,
DE = 1.1 segundo), and theory-of-mind (mean = 8.4 segundo, DE =
1.5 segundo). The experimental conditions did not differ [F(3,
60) = 66.41, pag < .001, post hoc Tukeyʼs HSD p < .05]. Autobiographical memory, prospection, and theory- of-mind shared a common pattern of neural activity that accounted for 81.42% of the covariance in the data and was reliably differentiated from the control condition (LV1; p = .002; Figure 2). This common pattern included activation of the midline structures in frontal and parietal lobes; left-lateralized activation of inferior frontal gyrus, temporal pole, middle temporal gyrus, superior tem- poral sulcus and inferior parietal lobule; and activation of right medial-temporal lobe (Table 1). In contrast, the control task was associated with increased bilateral activ- ity in lateral parietal (including IPS) and occipital cortex (Table 1). Burianova and Grady (2007) observed a similar pattern of activation with the same control task, which is similar to the task-positive network revealed by resting state functional connectivity (Fox et al., 2005), only with- out dorsolateral prefrontal cortex. A second significant pattern of brain activity dissociated autobiographical mem- ory and prospection from theory-of-mind, accounting for 13.75% of the covariance in the data (LV2; p = .056; Fig- ure 3). Autobiographical memory and prospection demon- strated relatively greater frontal and parietal midline activity, along with substantial involvement of the hippocampal formation (Table 2). Theory-of-mind, in contrast, engaged the lateral temporal regions and right temporo-parietal junction (Table 2). A critical question is whether these brain regions in- volved in autobiographical memory, prospection, and theory-of-mind are part of the DMN. The pattern of activity associated with LV1 and autobiographical mem- ory, prospection, and theory of mind closely resembles the DMN, although the spatial extent of MPFC is smaller and the overall pattern is less bilateral than previous char- acterizations of the DMN (e.g., Buckner et al., 2008; Figure 2). Indeed, many areas of activity associated with LV1 and LV2 were located within 2 cm of published values Figure 2. LV1 shows a functional differentiation between autobiographical memory (Past), prospection (Future), and theory-of-mind (Other) conditions (represented as warm colors) and control (cool colors) at TR4. Left medial and lateral views are on the left. The temporal brain score chart (bottom) conveys changes in brain activity related to task over time. For each LV, mean brain scores (summed scores of activity across the entire brain of each participants and averaged across participants) show the divergence between experimental and control conditions over time (eight 2-sec TRs), and are analogous to hemodynamic response functions typically plotted for individual brain regions. 1116 Journal of Cognitive Neuroscience Volume 22, Number 6 D o w n l o a d e d l l / / / / j f / t t i t . : / / f r o m D h o t w t n p o : a / d / e m d i f t r o p m r c h . s p i l d v i e r e r c c t . h m a i r e . d u c o o m c / n j a o r c t i n c / e a - p r d t i 2 c 2 l 6 e - 1 p 1 d 1 f 2 / 1 2 9 2 3 / 9 6 5 / 8 1 4 1 o 1 c 2 n / 1 2 0 7 0 6 9 9 5 2 6 1 4 2 8 / 2 j o p c d n . b y 2 0 g 0 u 9 e . s t 2 o 1 n 2 8 0 2 8 . S p e d p f e m b y b e g r u 2 0 e 2 s 3 t / j f t . / . . o n 1 8 M a y 2 0 2 1 Figure 3. LV2 differentiates autobiographical memory (Past) and prospection (Future) (represented as cool colors) from theory-of-mind (Other) (warm colors), where control is roughly at zero at TR5. Temporal brain scores (bottom) demonstrated maximal differentiation at the fifth TR. Left medial and lateral views are on the left. D o w n l o a d e d l l / / / / j f / t t i t . : / / f r o m D h o t w t n p o : a / d / e m d i f t r o p m r c h . s p i l d v i e r e r c c t . h m a i r e . d u c o o m c / n j a o r c t i n c / e a - p r d t i 2 c 2 l 6 e - 1 p 1 d 1 f 2 / 1 2 9 2 3 / 9 6 5 / 8 1 4 1 o 1 c 2 n / 1 2 0 7 0 6 9 9 5 2 6 1 4 2 8 / 2 j o p c d n . b y 2 0 g 0 u 9 e . s t 2 o 1 n 2 8 0 2 8 . S p e d p f e m b y b e g r u 2 0 e 2 s 3 t / j . / . f . t o n 1 8 M a y 2 0 2 1 for nodes within the DMN (Toro et al., 2008; Fox et al., 2005). The conditions differentially activated DMN for LV2 (Figure 3). Remembering the past or thinking about the future preferentially activated midline and medial temporal lobe structures, whereas theory-of-mind reasoning prefer- entially activated lateral temporal and parietal regions. Thus, brain activity across the conditions showed overlap, as well as some functional specialization, within the DMN. Hemodynamic response function plots of peak voxels in DMN regions from LV1 (Figure 4A–I) demonstrated a nearly uniform pattern of covariance, dissociating auto- biographical memory, prospection, and theory of mind from control in dorsal and ventral MPFC, bilateral lateral temporal cortex, bilateral inferior parietal lobule, and right parahippocampus. The theory-of-mind condition was not dissociated from control in left parahippocampus (Fig- ure 4G). The contribution of theory of mind to the pattern of activity in posterior cingulate also was less robust (Fig- ure 4I). A recently published formal graph-analytic network analysis of resting state functional connectivity correlations revealed five distinct yet highly interconnected hubs: MPFC, bilateral IPL, and two in posterior cingulate, one rostral (−2, −38, 36) and one caudal (−1, −53, 32) (Buckner et al., 2009; coordinates in MNI space). Response function plots of these two hubs within posterior cingulate cortex (Figure 4K, L) demonstrated theory of mind covarying with autobiograph- ical memory and prospection in only the caudal region of posterior cingulate. Both regions reliably contributed to the pattern of activity observed in LV1. However, only the ros- tral portion was reliably involved in the pattern identified by LV2 (BSR = −10.3) and was associated with autobiograph- ical memory and prospection. The caudal region was not (BSR = −2.4). Both seed PLS analyses revealed a significant pattern of functional connectivity ( p = .002) that was reliable for MPFC (a key node in the DMN) and IPS (a key node in the task-positive network) based on a 99% confidence interval, for all three experimental conditions. In each experimental condition, measures of overall brain activity were significantly correlated with activity in the seed voxel across subjects: in the MPFC seed analysis, r = .87 for autobiographical memory, r = .88 for prospec- tion, and r = .74 for theory-of-mind; in the IPS seed anal- ysis, r = .81 for autobiographical memory, r = .95 for prospection, and r = .85 for theory of mind. The hemo- dynamic response function plots for the two seed voxels are shown in Figure 4B and J. If thinking about the past, future, or the thoughts and feelings of others was associated with the DMN then the MPFC seed should be correlated with core regions of the DMN (Buckner et al., 2008) in these three conditions. This was indeed the case—the MPFC seed was correlated with activity in the left frontal pole, left inferior parietal lobule, medial parietal cortex, bilateral medial temporal Spreng and Grady 1117 Table 2. Peak Regions Associated with LV2 DISCUSSION Location Hemis BA x y z Ratio Other > Past, Future

STS/MTG

Temporo-parietal junction

STS

Past, Future > Other

PCC

RSC

PHC

Fusiform gyrus

PHC

CAC

Frontal pole

Cerebellum

MFG

Thalamus

Cerebellum

IFG (orbitalis)

PHC

Head of caudate

Brainstem

21/22

48 −36 −4

48 −48

22 −52 −48

8.0

7.2

6.6

31 −4 −36

40 −14.5

31 −8 −60

24 −12.0

29 −8 −44

8 −11.5

36 −24 −40 −20 −10.7

19 −32 −80

44 −10.1

8 −40

4 −9.6

NA −20 −20 −24 −8.1

32 −4

10 −16

4 −8.1

12 −7.8

16 −44 −52 −7.3

6 −24

52 −7.0

4 −8

12 −6.8

44 −72 −44 −6.8

47 −32

24 −8 −6.6

28 −40 −12 −6.4

NA −12

12 −4 −6.0

NA −4 −20 −28 −5.4

lobes, and bilateral inferior temporal gyri (Mesa 3). El
only DMN regions not included in this pattern of connec-
tivity were the right lateral parietal cortex and right frontal
pole. Alternativamente, if thinking about the past, future, or the
thoughts and feelings of others was associated with the
task-positive network, functional connectivity would be
expected within the core regions of this network, como
anterior insula, frontal eye fields, supplementary motor
área, dorsolateral prefrontal and ventral occipital cortex.
Sin embargo, within the task-positive network, activity in the
IPS voxel was only correlated with contralateral IPS region
and left ventral occipital cortex (Mesa 3). No other core re-
gions of this network were significantly correlated. En cambio,
the IPS seed was functionally associated with some DMN
regiones, including medial parietal cortex, as well as medial
and lateral temporal cortex (Mesa 3). Both seeds demon-
strated functional correlations with regions outside of the
networks as well, such as cerebellum, cuneus, and occipital
corteza (Mesa 3). En general, the seed PLS analyses indicated
more engagement of the DMN than the task-positive net-
work during the experimental conditions.

en este estudio, we investigated the neural mechanisms
underlying autobiographical memory, prospection, y
theory of mind, and determined whether these domains
rely upon a pattern of brain activity operating within the
DMN. We used PLS analysis of fMRI data to examine
whole-brain patterns of activity associated with thinking
about the past, the future, and the thoughts and feelings
of others. We then used seed PLS to examine the func-
tional connectivity of brain regions that have previously
been shown to be functionally associated with the DMN
and the task-positive network while participants are at
descansar (Fox et al., 2005).

Autobiographical memory, prospection, and theory of
mind shared a common pattern of brain activity, incluir-
ing midline structures in the frontal and parietal lobes.
This is consistent with brain activity related to self- y
other-referential thought (DʼArgembeau et al., 2008;
Johnson et al., 2006; Northoff & Bermpohl, 2004). adi-
cionalmente, activation was observed in right medial temporal
lobe and left-lateralized activation in inferior frontal
gyrus, middle frontal gyrus, temporal pole, lateral tem-
poral lobe, and inferior parietal lobule. Notablemente, we found
activation of these DMN regions in the experimental
condiciones, relative to the control condition, a pesar de la
fact that our participants may have reverted back to the
default mode after completing the easy and rapidly per-
formed sensorimotor control task. De este modo, autobiographical
memory, prospection, and theory-of-mind tasks may acti-
vate DMN regions over and above spontaneous default
actividad. The observed regions may support the genera-
tive processing related to each of the experimental condi-
ciones, including semantic retrieval (Binder, Desai, Tumbas,
& Conant, in press; Martín & chao, 2001); the recollection
of generic scripts that frame the remembered or imagined
scene; and the integration of sensorimotor modalities com-
prising these scenes. En general, the functional coordination
of these heteromodal regions may be sufficient for pro-
ducing self-relevant stimulus-independent thought.

Autobiographical memory and prospection demon-
strated greater frontal and parietal midline activity,
relative to theory-of-mind. Notablemente, there was also sub-
stantial involvement of the hippocampal formation for
autobiographical memory and prospection: This may
be due to the temporal extension of the self and greater
recombination of contextualized event details involved
in remembering and prospection (Hassabis, Kumaran, &
Maguire, 2007; Schacter & Addis, 2007; Moscovitch, Nadel,
Winocur, Gilboa, & Rosenbaum, 2006). A diferencia de, theory-
of-mind reasoning uniquely activated superior temporal
sulcus and right temporo-parietal junction, which may be
preferentially engaged in mental and biological inferen-
cing more specific to this domain (Gallagher & Frith, 2003;
sajonia & Kanwisher, 2003). Alternately, the medial/ lateral
dissociation may be due to the allocation of attention to
internal representations versus external stimuli (Buckner

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Cifra 4. BOLD signal
response function plots.
The magnitude of
hemodynamic response
function change is on the
y-axis; TRs are on the x-axis.
Bootstrap ratios (BSR) son
from LV1 at TR4. A and C–I
are peak LV1 voxels in default
mode regions. B is the DMN
seed region, contiguous to
the peak ventral MPFC voxel
(−4, 48, −16), not pictured.
As indicated by the BSR, todo
voxels were highly reliable and
remain so over multiple time
puntos; sin embargo, some of these
regiones (B, mi, F, GRAMO) no lo hizo
meet the 10-voxel cluster size
cutoff for reporting in Table 1.
J is the task-positive seed
región. K and L are discrete
cortical network hubs in
rostral posterior cingulate
corteza (rosPCC) and caudal
posterior cingulate cortex
(cauPCC) identified by graph
análisis (Buckner et al., 2009).
Please refer to Table 1 nota
for abbreviations.

et al., 2008). Eso es, participants engaged in memory and
prospection may have used the cue to access internal rep-
resentaciones, whereas in the theory-of-mind condition, par-
ticipants may have needed to retrieve more information
about the photographs in order to imagine the mental
states of the depicted people.

Although autobiographical memory, prospection, y
theory-of-mind are types of stimulus-independent
pensamiento, and appear to engage the DMN, there is little
consensus on whether the DMN is actually responsible
for these kinds of processing. To further complicate the
issue, monkeys show DMN activity (Vincent et al., 2007)
but may have little concept of time (Roberts, 2002); en
contrast, children with rudimentary autobiographical
memory, prospection, and theory-of-mind skills do not
have a fully developed DMN (Fair et al., 2008). Studying
evolutionary changes to the frontal poles and lateral parietal
corteza, and investigating developmental maturation of
brain characteristics such as frontal white matter myelina-
ción, could resolve these issues eventually. Sin embargo,
current functional neuroimaging methods are sufficient
for examining the hypothesis that stimulus-independent

pensamiento, such as autobiographical memory, prospection,
and theory-of-mind, share a common neural basis in
humans within the DMN. Our task-related functional con-
nectivity analysis was capable of recapitulating most of the
DMN, thereby supporting this hypothesis. Absent was right
lateral parietal cortex, which is hypothesized to be involved
in heteromodal integration between external salience and
internal representations (Corbetta, patel, & Shulman, 2008),
a task demand predominant in only the theory-of-mind
condición (LV2). The right frontal pole was also absent from
the connectivity pattern, which is surprising considering
that damage to this region can result in impaired perspec-
tive taking (Estúpido, Gallup, & Alexander, 2001) and episodic
memory (Rodador, Estúpido, & Tulving, 1997). The task-positive
network, sin embargo, was not associated with autobiograph-
ical memory, prospection, or theory-of-mind. En cambio, el
results from the seed PLS analyses suggest that IPS, a key
node of the task-positive network, can in fact be correlated
with areas of the DMN when engaged in structured in-
trospective behaviors, even though the two networks are
“anticorrelated” when functional connectivity is assessed
during the resting state (Fox et al., 2005). This disparity

Spreng and Grady

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Mesa 3. Functional Connectivity of the MPFC and rIPS Associated with Autobiographical Memory, Prospection, and Theory-of-Mind

MPFC Seed

IPS Seed

fc-Region

Hemis

Ratio

fc-Region

Hemis

Ratio

Default Mode Regions

0 −68

7.8

PCu

0 −60

7.2

PCu

PCC

ITG/MTG

ITG

Frontal pole

IPL

31/23

−8 −40

−36 −28 −12

36 −20 −16

20/21 −64 −16 −20

48 −16 −28

−8

−48 −60

12.1

6.6

8.3

6.3

4.9

6.4

5.3

PHC

MTG

IPS

MT+

Task-positive Regions

Other Regions

Cerebellum

SOG

Cuneus

Precentral gyrus

MCC

−16 −60 −16

6.2

Cerebellum

4 −88

−4 −84

52 −12

8 −16

Cerebellum

7.1 MOG

5.5

Cuneus

IFG

Brainstem

SMG

8.1

6.9

7.8

Lingual gyrus

28 −20 −28 −12

0 −20

6.9

5.8

60 −28 −12

9.4

7 −20 −64

37 −48 −60

14.7

6.6

NA −28 −48 −24

36 −48 −28

6.6

8.3

19 −36 −76

12.0

−4 −72

24 −60

NA −12 −28 −28

40 −60 −24

18 −28 −76

−8

8.7

6.5

7.8

6.4

5.1

fc-Regions are functionally connected regions in the network. Regions labeled as DMN or task-positive are within 2 cm of published coordinates for
this network and within the same brain structure.

suggests that regions comprising the default mode and
task-positive networks may not be mutually inhibitory,
or may be a consequence of the functional connectivity
methodology (such as regressing out global mean signal;
Murphy, Hijo, Handwerker, jones, & Bandettini, 2009).
Sin embargo, the absence of a positive association between
IPS and the experimental conditions in the task PLS analysis
limits strong conclusions.

No previous experiment has directly examined the
relations among autobiographical memory, prospection,
and theory-of-mind. One study compared cued autobio-
graphical recollection from personal photos against a
theory-of-mind type control task where participants
imagined scenarios from strangerʼs photographs, incluir-
ing the thoughts and feelings of people in the photos
(Gilboa, Winocur, grady, Hevenor, & Moscovitch, 2004).
The results from their univariate analysis of autobio-

graphical memory closely resembled the midline and
medial-temporal regions found here in LV2.1 Univariate
análisis, sin embargo, does not detect the optimal relationship
between brain activity and conditions unlike the multivari-
ate analysis that was used in this study. Consistent with stud-
ies comparing autobiographical memory and prospection,
a common pattern of neural activity is observed (Schacter
& Addis, 2007), although some subsystems may differ
(Addis, Cacerola, Vu, Laiser, & Schacter, 2009). Notablemente, el
present work demonstrated common and differential re-
cruitment between autobiographical, prospection, y
theory-of-mind. Multivariate methods are not only more
sensitive than the standard General Linear Model in detect-
ing distributed patterns of brain activity (McIntosh et al.,
2004), but are capable of quantifying the amount of covar-
iance associated with neural events that can be explained
by the tasks. We found that the amount of variance in brain

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activity shared by the experimental conditions actually was
greater than that which differentiated them, relative to the
sensorimotor control condition. The shared pattern of
neural activity in LV1 and the MPFC seed PLS analyses sup-
port the hypothesis that the same network is responsible
for the core processing of the experimental tasks. Más,
LV2, which accounts for less variance in neural activity, may
reveal functional specialization of regions within DMN
subsystems. Resting state functional connectivity analysis
supports this view. Seed activity in posterior cingulate,
medial prefrontal, or lateral parietal cortex are correlated
with the entire default mode network (Fox et al., 2005;
Buckner et al., 2008). Autobiographical memory and pros-
pection, sin embargo, are associated with the hippocampal
formation subsystem (Vincent et al., 2006). Más, estafa-
nectivity with a dorsal MPFC seed region is associated with
the theory-of-mind regions (Buckner et al., 2008). Core re-
gions common to autobiographical memory, prospection,
and theory-of-mind may support the construction and
integration of personally salient information. Subsystems
may provide specialized information to the core DMN.
This may include information from prior experiences
via input from the medial-temporal lobes, as well as elabo-
rated representations of other peopleʼs actions and inten-
tions with input from posterior STS and temporo-parietal
junction.

The common brain activity across the experimental
conditions might simply reflect neural processes driven
by the carryover effect of viewing complex photographs
and/or making a manual rating in response to a mental
evento; sin embargo, this is unlikely for several reasons. Primero,
we limited the time points included in the analysis to
those where self-projection was taking place and not
when photos were being viewed. Además, actividad
was normalized to the first TR after the photographs
were viewed, reducing the impact of the BOLD signal
related to prior perception. With spatio-temporal PLS,
the progression of BOLD signal change over time is ana-
lyzed. In focusing our interpretation on the fourth and
fifth TR, the impact of BOLD signal associated with photo-
graph viewing was further reduced, although may still
account for some covariance. Segundo, the shared pattern
of brain activation is also unlikely to be related to the clarity
ratings to any great extent. Most studies of autobiograph-
ical memory include a behavioral rating, such as amount
of detail, immediately following the recollective interval.
Participant awareness of an impending rating is unlikely
to confound the phenomenological experience and asso-
ciated neural activity of these processes prior to ratings
actually being made, although these processes undoubt-
edly influence the rating itself. The absence of ratings,
sin embargo, would eliminate a means to assess compliance.
Además, in this study, ratings occurred, on average,
9 sec after the participants were instructed to begin re-
collecting, planificación, or thinking about the thoughts and
feelings of others. Como resultado, BOLD signals related to
clarity ratings fell outside the interpreted analysis.

Tercero, Burianova and Grady (2007) used a similar para-
digm and found the first LV dissociated experimental
condiciones (autobiographical, episodic, and semantic
memory retrieval) from a sensorimotor control condition
identical to the one used here. In their experiment, com-
plex photographs were also viewed and a behavioral
rating was made in the experimental conditions. En el
control condition, scrambled images were also presented
and a manual response was made. En tono rimbombante, the re-
gions identified by Burianova and Grady as common
across retrieval conditions showed little overlap with
the regions identified here as common to autobiograph-
ical memory, prospection, and theory of mind. Sin embargo,
both experiments found increased activity across ex-
perimental conditions in left lateral inferior and middle
frontal gyri (Brodmannʼs areas 47, 8). These regions are
involved in cognitive control (Vincent, Kahn, Snyder,
Raichle, & Buckner, 2008; Brass, Derrfuss, Forstman,
& por cramon, 2005), y por lo tanto, are likely to be involved
across multiple cognitive domains. Tomados juntos, el
evidence from both studies, as well as the high rates of
participant compliance (as indicated by the clarity ratings),
makes it likely that the shared pattern of covariance (seen
after the instructions are presented but before the clarity
ratings are made) is related to the shared processes of the
experimental conditions themselves.

The current set of analyses provides converging evidence
that DMN regions are engaged with specific cognitive behav-
iors. These behaviors may not be limited to those observed
aquí, but may also include related processes such as moral
Toma de decisiones (verde, Sommerville, nistrom, Darley, &
cohen, 2001), fictional narrative simulation (Mar & Oatley,
2008; Mar, 2004), or mind-wandering (cristóbal, gordon,
Smallwood, Herrero, & Schooler, 2009; Mason et al., 2007). En
order to determine the neural (en)dependence of these
procesos, sin embargo, neuropsychological investigations into
co-occurring autobiographical and interpersonal deficits with
compromised functional integrity of the midline, and lateral
parietal and lateral temporal cortex are also necessary.

Our analyses were designed to investigate the neural
mechanisms underlying autobiographical memory, pros-
pection, and theory-of-mind, and to determine if these
domains rely upon a pattern of brain activity operating
within the DMN. The results provide the first direct evi-
dence to support previous independent observations
that projection of the self into the past, the future, o
the minds of others engages a common set of brain
regions largely overlapping with the DMN (Spreng et al.,
2009; Buckner & Carroll, 2007). Task-related functional
connectivity analysis revealed reliable correlations within
the core regions of the DMN, and only two nodes in the
task-positive network, suggesting that the DMN was
engaged during our experimental conditions, but not the
task-positive network. The present study does not directly
compare the experimental tasks with “rest.” Although pre-
and postscan questionnaires have helped clarify resting
state cognition (p.ej., Andrews-Hanna, Huang, Reidler, &

Spreng and Grady

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Buckner, 2008; Mason et al., 2007), we remain unsure what
people do while resting. In order to circumvent this issue,
novel techniques and analyses are needed to assess default
cognition and its neural associations. Por ejemplo, uno
study assessed the overlap between episodic memory
and theory-of-mind tasks, and then determined peak ac-
tivityʼs relationship with the DMN using resting state func-
tional connectivity analysis (Andrews-Hanna, sajonia, Poulin,
& Buckner, 2007). The present set of analyses provides
converging evidence that the neuroanatomical correlates
of autobiographical memory, prospection, and theory-of-
mind are shared and that the DMN is involved in the pro-
cessing necessary to carry out these specific cognitive
behaviors. This sharing of neural resources may allow
remembering the past and imagining the future to provide
a “long view” in decision-making, over and above stimulus–
reward driven behavior, thereby facilitating theory-of-mind
and promoting social cooperation (Boyer, 2008).

Expresiones de gratitud
We thank the MRI technologists at Baycrest Centre, Magda
Wojtowicz, Dale Stevens, and Karen Spreng for their assistance
with this project. This work was supported by a grant from the
Canadian Institutes of Health Research (MOP14036 to C. l. GRAMO.),
by infrastructure support from the Ontario Research Fund and
the Canadian Foundation for Innovation. Dr. Grady also is
supported by the Canada Research Chairs program.

Reprint requests should be sent to R. Nathan Spreng, Departamento
of Psychology, Harvard University, 33 Kirkland Street, Cambridge,
MAMÁ 02138, o por correo electrónico: nathan.spreng@gmail.com.

Nota

1. During the preparation of this article, we learned of a highly
relevant paper by Rabin, Gilboa, Estúpido, Mar, and Rosenbaum
(2010) who used a very similar paradigm as Gilboa et al., (2004),
but included a common baseline to assess conjunction as well as
differences between autobiographical memory and theory of
mente. Despite different methods, the authors report a striking
consistency with the present findings.

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