焦点功能: - 麻省理工学院人工智能研究专业

焦点功能:
Linking Experimental and Computational Connectomics

An architectonic type principle integrates
macroscopic cortico-cortical connections
with intrinsic cortical circuits
of the primate brain

克劳斯·C. 希尔格塔格

1,2, Sarah F. Beul1, Sacha J. van Albada3, and Alexandros Goulas1

1计算神经科学研究所, 艾彭多夫大学医学中心, 汉堡大学, 德国
2健康科学系, 波士顿大学, 波士顿, 嘛, 美国
3Institute of Neuroscience and Medicine (INM-6), Institute for Advanced Simulation (IAS-6), and JARA-Institute of Brain
Structure-Function Relationships (INM-10), Jülich Research Centre, 德国

关键词: Cortical connectome, Wiring principles, Cortical structural gradients, Cytoarchitecture

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抽象的

The connections linking neurons within and between cerebral cortical areas form a
multiscale network for communication. We review recent work relating essential features
of cortico-cortical connections, such as their existence and laminar origins and terminations,
to fundamental structural parameters of cortical areas, such as their distance, similarity in
cytoarchitecture, deﬁned by lamination or neuronal density, and other macroscopic and
microscopic structural features. These analyses demonstrate the presence of an architectonic
type principle. Across species and cortices, the essential features of cortico-cortical
connections vary consistently and strongly with the cytoarchitectonic similarity of cortical
地区. 相比之下, in multivariate analyses such relations were not found consistently for
distance, similarity of cortical thickness, or cellular morphology. Gradients of laminar
cortical differentiation, as reﬂected in overall neuronal density, also correspond to regional
variations of cellular features, forming a spatially ordered natural axis of concerted
architectonic and connectional changes across the cortical sheet. The robustness of ﬁndings
across mammalian brains allows cross-species predictions of the existence and laminar
patterns of projections, including estimates for the human brain that are not yet available
experimentally. The architectonic type principle integrates cortical connectivity and
architecture across scales, with implications for computational explorations of cortical
physiology and developmental mechanisms.

作者总结

The mammalian cortex possesses multiple dimensions of organization, 例如, 这
connectional and the cytoarchitectonic dimension. Are there principles that link the
different dimensions? Here we review an architectonic type principle that links
cytoarchitectonic aspects of the cerebral cortex, such as neuron density or morphology
across the cortical layers, to large-scale interregional cortical connection patterns. 这
reviewed ﬁndings highlight the existence of a natural axis of spatially ordered, concerted
changes of multiple architectonic, connectional, and functional features stretching from less
to more differentiated cortical areas. This framework comprises species-general, 但是也

开放访问

杂志

引文: 希尔格塔格, C. C。, Beul, S. F。,
van Albada, S. J。, & Goulas, A. (2019).
An architectonic type principle
integrates macroscopic cortico-cortical
connections with intrinsic cortical
circuits of the primate brain. 网络
神经科学, 3(4), 905–923.
https://doi.org/10.1162/netn_a_00100

DOI:
https://doi.org/10.1162/netn_a_00100

已收到: 13 十二月 2018
公认: 7 六月 2019

利益争夺: 作者有
声明不存在竞争利益
存在.

通讯作者:
克劳斯·C. 希尔格塔格
c.hilgetag@uke.de

处理编辑器:
Jochen Triesch

版权: © 2019
麻省理工学院
在知识共享下发布
归因 4.0 国际的
(抄送 4.0) 执照

麻省理工学院出版社

An Architectonic Type Principle of the Primate Brain

species-speciﬁc, principles of the organization of the mammalian, and particularly the
primate, cerebral cortex and highlights potential developmental underpinnings as well as
functional ramiﬁcations of such principles.

SEARCHING FOR PRINCIPLES OF CORTICAL CONNECTIVITY

Why Search for Principles of Brain Organization

The wiring of the cerebral cortex appears highly structured, but its precise organization is over-
whelmingly difﬁcult to discern. 尤其, the large number of neural elements and the vast
number of intricate interactions among them obscure potential regularities. A similar level of
complexity exists in other aspects of brain organization, such as the diversity and distribution of
different cell types (Cembrowski & Menon, 2018; Molyneaux, Arlotta, Menezes, & Macklis,
2007), the arrangement of neurotransmitters and receptors (Palomero-Gallagher & Zilles, 2017;
Zilles & Palomero-Gallagher, 2017), and diverse morphological features at the micro- (cellular)
(Elston, 2002, 2003) and macro- (区域性的) 规模. 因此, at ﬁrst sight, it appears almost impos-
sible to integrate the many different dimensions of brain organization. 幸运的是, 然而,
some of these aspects are intrinsically related through fundamental organizational principles,
substantially reducing the dimensionality of the problem. 因此, underlying principles of cor-
tical wiring and architecture curb the complexity of cortical organization. 而且, 迪斯-
covery of such integrative principles, linking the different dimensions of cortical organization,
may hint at central mechanisms of brain evolution and development and may facilitate the
understanding of brain function.

Motivated by the wish to integrate different dimensions of brain organization and the hope
to understand mechanisms of development and evolution that produce the complex neural
substrate, several groups including ours have been striving to identify regularities and prin-
ciples in the organization of brain connectivity, particularly the macroscopic interareal con-
nections of the mammalian cerebral cortex, frequently guided by a cross-species mammalian
看法 (Goulas, Majka, Rosa, & 希尔格塔格, 2019; Goulas, Zilles, & 希尔格塔格, 2018; van den
爬坡道, 布莫尔, & 斯波恩斯, 2016). In this context they have also investigated the relation of
connection features to other structural aspects of the brain. Note that here we reserve the term
“principle” for regularities that can be supported by mechanistic explanations of their occur-
rence. 尤其, principles of cortical wiring may be explained by mechanisms of brain
development and plasticity, and may allow the integration of cortical structure, 连接性,
and function (数字 1).

While there are many possible aspects of wiring that could be addressed, a helpful initial
goal is to explain basic features of cortical connections, such as the existence and density of
connections as well as the patterns of laminar origins and terminations of projections. 其他
such feature would be the direction of projections (Kale, 扎莱斯基, & Gollo, 2018). 因此, 在
the present review, we do not primarily focus on high-order organizational features of cortical
brain networks, 例如, 例如, their rich-club topology, which are worthwhile features
to explain in their own right, but may in fact arise from the more basic aspects of brain network
组织 (鲁比诺夫, 2016).

Physical Embedding of Connectivity and Minimal Wiring

One well-established and intuitive idea is that brain connectivity is shaped by the physical
embedding of the brain in space (Henderson & 罗宾逊, 2011; Roberts et al., 2016), 哪个

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An Architectonic Type Principle of the Primate Brain

数字 1. Principles of cortical wiring integrate regularities of cortical architecture, 连接性,
and function through mechanistic explanations. Connections create functions of brain areas, 和
functional interactions among areas, from the structural substrate of the brain, and speciﬁcally the
cortical sheet. 尤其, areas are linked through connections which have a laminar composition
that is appropriate for the laminar microenvironment within the respective areas as well as the type of
information exchange between these areas. 因此, local cortical architecture, the connection features
of a cortical area, and an area’s functional role within the cortical network are tightly intertwined.
Adapted from Beul and Hilgetag (2019).

constrains the development of neural connections (Kaiser & 希尔格塔格, 2004; Kaiser, 希尔格塔格,
& van Ooyen, 2009). The idea of a strong inﬂuence of the spatial layout on the organization
of connections is also related to the engineering-inspired concept of minimal wiring (Ramón y
Cajal, 1899), which suggests that the length and volume of wiring reﬂects a substantial cost in
brain development and function and should thus be as small as possible (reviewed in Sterling
& Laughlin, 2015). While numerous studies have demonstrated that wiring economy indeed
appears to affect the organization of brain connectivity, as reviewed in Bullmore and Sporns
(2012), it is also clear that minimal wiring is not the only structural or functional constraint on
brain organization (Kaiser & 希尔格塔格, 2006; Roberts et al., 2016; 鲁比诺夫, 2016). 反而, 这
brain is subject to multiple structural and functional evolutionary constraints that may be partly
antagonistic (陈, 王, 希尔格塔格, & 周, 2013, 2017), as well as constraints imposed by
the evolutionary history and dynamic stability of the nervous system (Gollo et al., 2018).

Embedding of Cortical Connectivity in Brain Architecture

One alternative perspective on brain organization also has a long tradition in brain research,
particularly in the investigation of the cerebral cortex. Classical neuroanatomists, such as Brod-
mann, the Vogts, or von Economo and Koskinas, used regional variations in architectonic fea-
tures of the brain, such as neuronal density or thickness of cortical layers, in order to parcellate
and characterize brain regions. This work was founded on the central tenet of biology, already
recognized by Aristotle1 (350 广告), that differences in biological function should vary with

1 “The thinkers however to whom we are referring attempt to state the nature of the soul only: with regard
to the nature of the body which is to receive the soul they determine nothing in particular. And thus, 虽然
every body seems to possess a distinctive form and character, they act as if it were possible for any soul to cloth
itself in any body…” (Peri psych ¯es I, 3).

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An Architectonic Type Principle of the Primate Brain

differences of structure. 因此, the architectonic differences of cortical areas were used to de-
lineate structural parcels that may also operate as specialized functional units.

Such anatomical approaches observed that there may be systematic variations, in terms of
spatially deﬁned gradients of brain architecture, as expressed by the differential density of neu-
ral populations across the cortical layers. 尤其, von Economo and Koskinas categorized
areas into so-called cortical types (von Economo, 1927; von Economo & Koskinas, 1925), 和
Sanides (1962) linked gradients of cortical types to their evolutionary origins. It was also sug-
gested that such architectonic gradients shape basic features of connectivity (Pandya & Sanides,
1973). 尤其, in her “structural model of connections” (García-Cabezas, Zikopoulos, &
Barbas, 2019), H. Barbas proposed that laminar terminations and origin patterns of prefrontal
cortical areas in the primate brain are directly linked to the relative differences in the lami-
nar differentiation and organization of cortical areas (Barbas, 1986; Barbas & Rempel-Clower,
1997).

Relations of Connectivity to Other Aspects of Brain Structure

Several further factors that may be related to connectivity have been tested. These factors in-
clude covariation of the overall cortical thickness of different regions as a proxy for connectiv-
性 (他, 陈, & 埃文斯, 2007; Lerch et al., 2006) or MR-based measurements (Seidlitz et al.,
2018) indicating structural similarity. 然而, the actual relation of these “morphological
networks” to structural or functional connectivity warrants further investigation, as these mea-
sures do not map directly onto each other (Reid et al., 2016), 和, 所以, “connectivity”
in the different contexts is used with different meanings and potentially reﬂects different
neurobiological aspects.

Patterns of gene expression may also be directly linked to connectivity (Fulcher & 假如,
2016) or structural covariation (Romero-Garcia et al., 2018). 而且, several studies have
explored which cellular properties are related to connectivity (Scholtens, 施密特, de Reus,
& van den Heuvel, 2014; van den Heuvel, Scholtens, Barrett, 希尔格塔格 , & de Reus, 2015). 在
特别的, these studies found a relation of the cell size of layer III pyramidal cells in different
cortical areas with features of connectivity, such as the number of connections that these areas
形式. 一般来说, while there are ﬁndings that several architectonic features at the macroscale
(such as cortical thickness) or microscale (cell size, density) may be related to cortico-cortical
连接性, the systematic relations among these features and connectivity are still unclear.
任何状况之下, the potential linkages among these measures necessitate the joint multivariate
analysis of as many available features as possible.

Based on these potential correlates of connectivity, our goal has been to systematically test
different concepts of cortical connectivity organization. 因此, we performed a series of stud-
ies in various cortical regions and across mammalian species, which are summarized in the
following sections. We used a wide range of variables to investigate the embedding of fun-
damental features of connectivity in brain space or brain architecture. 尤其, we used
Euclidean and geodesic distance as well as border distance as measures of spatial separation
and characterized essential features of cortical architecture categorically as well as quantita-
主动地. 在此背景下, we focused on a fundamental characterization of cortical architecture
as reﬂected in cortical type. Cortical type is a classical, comprehensive characterization of
cortical parcels and comprises the apparent density of cellular populations across the cortical
layers (希尔格塔格, Medalla, Beul, & Barbas, 2016). A simple quantitative proxy of cortical type
is neuronal density, measured across all cortical layers (Medalla & Barbas, 2006). It is already
known that the classical measure of neuronal density is the most characteristic measure for

Laminar differentiation:
The extent to which the cellular
density and morphology of cortical
layers differ and allow the layers to
be discriminated.

Cortical type:
An ordinal description and
classiﬁcation of cortical areas by the
density and appearance of their
cortical layers, ranging from less
clearly differentiated agranular
and dysgranular areas to more
differentiated “eulaminate” areas
(García-Cabezas et al., 2019;
Hilgetag et al., 2016). 全面的
neuron density may be employed as
a metric indicator of cortical type
(希尔格塔格, Medalla, Beul, & Barbas,
2016; Medalla & Barbas, 2006).

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An Architectonic Type Principle of the Primate Brain

Architectonic type principle:
The systematic relationships of
essential cortical connection features
to the cytoarchitecture of the
mammalian cerebral cortex. 这些
relationships manifest as variations of
connectional features, 例如
existence or laminar origin and
termination of projections, 和
spatially ordered, concerted
variations of structural features, 这样的
as neuron density and cellular
morphology, across the cortical
sheet.

identifying cortical areas (Dombrowski, 希尔格塔格, & Barbas, 2001). 此外, we considered
further morphological and cellular markers of the structural organization of cortical areas, 这样的
as cortical thickness, and cellular features, such as layer III pyramidal cell soma cross section,
dendritic synapse count, dendritic synapse density, and dendritic tree size.

THE ARCHITECTONIC TYPE PRINCIPLE UNDERLIES THE CONNECTIVITY OF
THE PRIMATE CONNECTOME

In order to assess the relations between essential features of cortical connections and cortical
建筑学, we investigated a comprehensive, quantitative compilation of connectivity data (A
connectome) for cortico-cortical connections of the macaque monkey brain (Markov, Ercsey-
扳机, 等人。, 2014; Markov, Vezoli, 等人。, 2014) together with quantitative measures of various
aspects of cortical structure. Present and absent pathways differ in terms of the features of the
potentially connected cortical areas. Areas linked by a connection are more similar in terms
of neuronal density and cortical thickness, and in terms of cellular morphological features
such as spine density and dendritic arborization. 而且, connected areas are also spatially
closer to each other than unconnected areas (Beul & 希尔格塔格, 2019). 然而, all of these
structural features are related to each other (比照. 数字 4). 所以, multivariate analyses are
required to disentangle the essential structural contributions to connectivity features. 使用
such an analysis (multivariate regression), we found that the most fundamental contributions
came from just two factors, neuronal density and distance, where in fact neuronal density was
the cortical dimension that was more consistently related to the existence and laminar origin
of connections (Beul & 希尔格塔格, 2019).

These insights can be used to predict connections by regression based on the proximity and
architectonic similarity of cortical areas. This approach allows one to assess the individual and
combined contributions of the different structural factors to explaining the existence of corti-
cal connections. The measures showed that architectonic similarity as well as distance were
individually strongly predictive of connections, while similarity of cortical thickness was not.
然而, the best prediction performance was achieved by combining architectonic similarity
with distance, leading to high classiﬁcation accuracy (Beul, Barbas, & 希尔格塔格, 2017).

尤其, the number of connections of an area (the area’s degree, in graph-theoretical terms)
was found to be inversely correlated to the area’s type or neuronal density, with less dense
(low-type) areas having more connections than dense (high-type) 地区 (Beul et al., 2017).
此外, core or rich-club areas (Ercsey-Ravasz et al., 2013; Harriger, van den Heuvel, &
斯波恩斯, 2012) are of low type; 那是, they possess low neuronal density.

Another essential feature of cortico-cortical projections is the pattern of their origins and
terminations in the cortical layers, which shapes spectral channels of interareal communication
(Bastos et al., 2015) and is a central feature in theories of brain function such as predictive
编码 (Bastos et al., 2012). The only factor that was signiﬁcantly correlated with the patterns
of laminar origins of primate cortico-cortical projections (Markov, Vezoli, 等人。, 2014) 是
relative neuronal density of the source versus the target area of the projection (Beul & 希尔格塔格,
2019). Larger positive differences in neuron density from connection source to connection
target were associated with projections mainly originating from upper cortical layers, 然而
negative neuron density differences were associated with projection origins in deep cortical
layers. None of the other tested parameters showed a systematic correlation with the laminar
projection patterns. 因此, the cytoarchitectonic gradients of the cerebral cortex, reﬂected in
graded neuronal density differences, are the fundamental dimensions across which systematic

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An Architectonic Type Principle of the Primate Brain

shifts in the laminar origin of connections occur (Barbas, 1986; Barbas & Rempel-Clower,
1997; Beul & 希尔格塔格, 2019; Goulas et al., 2018).

EVIDENCE FOR THE ARCHITECTONIC TYPE PRINCIPLE ACROSS CORTICES
AND SPECIES

Cat Cortical Connectome

Analyses of further datasets widely conﬁrm the ﬁndings from the primate connectome. In par-
针状的, an analysis of the cat cortico-cortical connectome (Scannell, Blakemore, & Young,
1995) yielded very similar results (Beul, 授予, & 希尔格塔格, 2015). In a multivariate linear dis-
criminant analysis (LDA), border distance as well as architectonic type difference were found
to be associated with the presence or absence of connections, type difference more so than
distance, but the best classiﬁcation accuracy was achieved by combining the two factors.

As in the primate, the type of an area was inversely associated with the number of connec-
tions formed by the area, with low-type areas, including the core of the cat cortex (Zamora-
López, 周, & Kurths, 2010), forming more connections.

Type differences were also signiﬁcantly associated with the laminar projection patterns of
the cortico-cortical connections, such that projections from a higher type to a lower type area
formed forward pathways, while projections from the lower type to a higher type area formed
feedback projections (Beul et al., 2015; 希尔格塔格 & 授予, 2010), once again highlighting the
cytoarchitectonic gradients of the cortex as a fundamental dimension across which systematic
changes of the laminar origin of connections manifest.

Mouse Cortical Macroconnectome

As in the primate and the cat, the existence of cortico-cortical connections in the mouse was as-
sociated with spatial proximity as well as similarity of cortical type of the potentially connected
地区 (Goulas, Uylings, & 希尔格塔格, 2017). 有趣的是, distance appeared to contribute more
strongly to the prediction of ipsilateral projections, while architectonic similarity contributed
more strongly for contralateral projections. Tests of the relationship between cortical types and
the laminar projection patterns in the mouse await the full release of such projection informa-
的. 尽管如此, the architectonic type principle and its accentuation across the spectrum of
mammalian cortical architecture (Goulas et al., 2018) allow predictions of laminar projection
patterns in presently untested connectomes. Speciﬁcally, for rodents, who have architecton-
ically less well-differentiated upper cortical layers than species such as the cat or macaque
猴, we predict that the laminar origin of connections will be less varied across the corti-
cal sheet, with most projections having a bilaminar origin or originating from the deep cortical
layers (比照. 希尔格塔格 & 授予, 2010).

Findings for Further Connectivity Data

In addition to the studies already described above, there is a wealth of evidence supporting
the architectonic type principle across different cortical regions and across different species.
起初, Barbas (1986) demonstrated the correlation between the laminar origin patterns
of projections and the cortical type of the projection origin for projections to the prefrontal
cortex in the primate brain. These ﬁndings were later extended to terminations of prefrontal
连接 (Barbas & Rempel-Clower, 1997) and connections of the prefrontal cortex with
other lobes. 而且, the architectonic type principle also applies to the laminar origins
of projections to the amygdala (Ghashghaei, 希尔格塔格, & Barbas, 2007), and to the laminar

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An Architectonic Type Principle of the Primate Brain

patterns and existence of cortico-cortical connections with the contralateral hemisphere in the
primate (Barbas, 希尔格塔格, Saha, Dermon, & Suski, 2005). In a study of the laminar patterns of
parietal-prefrontal projections, Medalla and Barbas (2006) demonstrated that overall neuronal
density can be used as a metric proxy of cortical type, and that this variable also explained
small variations of the laminar patterns. Using this proxy, 施密特, Bakker, 希尔格塔格, Diesmann,
and van Albada (2018) predicted laminar origin patterns in macaque vision-related cortex. 这
analysis further showed laminar termination patterns from the CoCoMac database (Bakker,
Wachtler, & Diesmann, 2012) to relate to the laminar origin patterns, consistent with the clas-
sic work of Felleman and Van Essen (1991). 因此, differences in neuronal density or architec-
tonic type are also predictive of laminar termination patterns among the vision-related areas
of macaque cortex (Hilgetag et al., 2016).

此外, the architectonic type principle was observed for laminar origin patterns of
extrastriate projections in the cat visual cortex (希尔格塔格 & 授予, 2010), as well as for the
existence and absence of connections and laminar origin patterns of the entire cat cortical
connectome (see above). 因此, there is widespread evidence across mammalian species and
different types of cortex of the relation of architectonic differentiation with essential features of
macroscopic cortical connectivity, giving rise to the hypothesis that this association may also
be present in the human brain (Goulas et al., 2016; Solari & Stoner, 2011).

These ﬁndings may be summarized in cortical wiring diagrams (数字 2) that show the
arrangement of cortical areas and their connections according to cortical types, with the most
highly differentiated areas on the outside and more poorly differentiated areas on the inside of
图表.

重要的, if differences in cortical architecture are to be predictive for connectivity fea-
特雷斯, such as the existence and laminar proﬁles of projections, there need to exist architectonic
differences between the cortical territories in the ﬁrst place. 最后, in species such as
rodents that show less pronounced differences between different cortical regions, a less pro-
nounced alignment between cortical architecture and connectivity is expected. Indeed Goulas
等人. (2019) showed that the cytoarchitectonic similarity of cortical areas relates to the exis-
tence of cortical connections in a species-speciﬁc manner (数字 3). A species-speciﬁc relation
between cytoarchitecture and connectivity is also apparent at the level of the global network
topology of mammalian connectomes. Core areas, 那是, areas tightly interconnected among
themselves as well as with the rest of the brain, differ in terms of cytoarchitecture in relation to
peripheral areas (less interconnected areas) in the cat and macaque monkey, with core areas
also constituting the less differentiated and less neuronally dense areas (数字 2, lower panels).
然而, this cytoarchitectonic segregation of core and periphery areas is statistically absent
in the marmoset monkey and completely absent in the mouse. Cytoarchitecture varies system-
atically with other cytological features, such as spine density, and overall myelination. 因此,
the synergy between topological segregation (core vs. 周边) and cytological properties
or its absence across species might have species-speciﬁc functional implications and denote
differences in the degree of vulnerability to pathology of these cortical areas across species
(see Goulas et al., 2019 欲了解详情).

INTEGRATION OF INTRINSIC CORTICAL ARCHITECTURE AND CIRCUITS WITH
MACROSCOPIC CONNECTIONS

Cortical
type indicates the intrinsic cytoarchitectonic organization of cortical areas as
well as patterns of extrinsic, cortico-cortical connections of the areas. 而且, the organi-
zation of area-intrinsic cortical circuits varies with type. 尤其, eulaminate areas, 与一个

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数字 2. Architectonic type principle across species. Upper panels: Maps of the cat and macaque cortex, indicating the variation of architec-
tonic differentiation across the cortex of these two species. Differentiation is represented as architectonic type in the cat cortex and as neuron
density in the macaque cortex. Lower panels: Visualization of cortico-cortical connections in the cat and macaque cortex. Cat connections
are shown as collated in Scannell et al. (1995); macaque connections are shown as published by Markov, Ercsey-Ravasz, 等人. (2014). Gray
rings correspond to degree of architectonic differentiation (determined as cortical type for the cat and by neuron density for the macaque) 和
cortical areas are placed accordingly, with differentiation increasing from center to periphery. Projections are color coded according to the
difference in architectonic differentiation between connected areas. Node sizes indicate the areas’ degree (那是, the number of connections
associated with them). For the cat cortex, ordinal projection strength (sparse, intermediate, or dense) is coded by increasing projection width
and nodes are grouped and color coded according to anatomical modules as indicated. Hub-module areas, as classiﬁed by Zamora-López
等人. (2010) in the cat and Ercsey-Ravasz et al. (2013) in the macaque, are marked by a white outline or red ﬁll, 分别. Panels adapted
from Beul et al. (2017, 2015).

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well-deﬁned laminar structure and high neuronal density, feature an intricate intrinsic circuitry
that has been described as a canonical microcircuit (Binzegger, Douglas, & 马丁, 2009;
Douglas, 马丁, & Whitteridge, 1989; Douglas & 马丁, 2004; Potjans & Diesmann, 2012),
in which intra- as well as interlaminar excitation are well balanced by populations of excitatory

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数字 3. Cytoarchitectonic similarity relates to the existence of connections in a species-speciﬁc
方式. (A) Increasing cytoarchitectonic dissimilarity of cortical areas results in a decrease of the
probability of the existence of a connection. This decrease is more pronounced for the cat when
compared with the mouse, as indicated by the larger probability decrease (shaded areas) 为了
same increase of cytoarchitectonic dissimilarity. (乙) Same relation as in (A), but for the comparison
of mouse versus macaque monkey. The shaded areas highlight the differences of probability of ex-
istence of a connection with an increase of cytoarchitectonic dissimilarity in the different species.
Note that the illustrated differences of probability of existence can be visually demonstrated in other
intervals, such as 0.4–0.5 or 0.7–0.8. The decrease of the probability of the existence of a connection
is more pronounced for the macaque monkey when compared with the mouse. (C) Same relation
如 (A), but for the comparison of cat versus macaque monkey. In this comparison, no species-
speciﬁc differences of the effect of cytoarchitectonic similarity on the probability of connections
were observed. (D) Brain size and phylogenetic distance of the mouse, macaque monkey, and cat.
Adapted from Goulas et al. (2019).

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Externopyramidization:
The rate of change of the ratio of
soma size of supragranular versus
infragranular pyramidal neurons. 这
rate can be calculated from the
amount of change in soma size ratio
across the cortical sheet.

and inhibitory neurons. Despite the idea that this circuit may form a constant template across
the cortical sheet, there exist variations of this template. Particularly, limbic (agranular and
dysgranular) 地区, which are characterized by the absence or a less marked appearance of a
granular layer and generally show fewer apparent layers and a lower overall neuronal density,
comprise a reduced microcircuit, which particularly appears to possess reduced interlaminar
inhibition (Beul & 希尔格塔格, 2015).

而且, the ﬁndings described above demonstrate that several of the macroscopic and
intrinsic structural features of cortical areas are linked. 例如, higher neuronal density
goes along with smaller cell cross sections and less elaborate morphological dendritic features,
while lower density coincides with larger cell cross sections and more elaborate dendritic mor-
phology (Beul & 希尔格塔格, 2019). The relations of connection features with the intrinsic con-
nectional and structural organization of areas offer an opportunity for integrating microscopic
and macroscopic architecture and connection features of cortical areas. 这些功能是
summarized in Figure 4. In terms of interareal connectivity, more frequent and denser connec-
tions exist between areas that are similar in cortical type, with similar overall neuron density.
The projections originate in a bilaminar fashion from the upper and deep cortical layers of the
source area, but predominantly in the upper cortical layers of the higher type areas, 和他们
terminate across all layers of the target area, but predominantly in the middle layers (granu-
lar layer IV, where it exists) of the lower type areas. 相比之下, areas of markedly different
type are either not connected or only sparsely connected. 这里, the projections arise mostly
in a unilaminar fashion from the upper cortical layers of the source area and terminate on the
middle to deep layers of the lower type target area. Such projections are complemented by
projections from the deep layers of the lower type area that terminate in the upper layers of
the higher type area.

Along with the regularities between cortical type or neuronal density and local morpho-
logical features, such as arborization of dendritic trees, these organizational principles of mi-
croscopic connectivity integrate microscopic cortico-cortical connections with the intrinsic
circuits of each cortical area. Such generic rules can be used to inform particularly the de-
velopment of large-scale cortical models. A ﬁrst example of such a model has already been
constructed (see “Implications of the Architectonic Type Principle for Large-Scale Simulations
of Cortical Dynamics” herein; 施密特, Bakker, 希尔格塔格, 等人。, 2018; 施密特, Bakker, 沉,
等人。, 2018).

DEVELOPMENTAL UNDERPINNINGS

Both within and across mammalian species, systematic covariation of multiple features of
cellular morphology has been observed. This includes a higher number and higher density
of spines and more complex dendritic arbors in prefrontal cortices of nonhuman primates
(Bianchi et al., 2013; Elston, 2003, 2007, 2011) and higher total dendritic length, 树突状
spine density, and dendritic spine numbers in the prefrontal cortex of the human brain (Jacobs,
2001). 而且, it has been observed that with increasing soma size, the amount of hete-
rochromatin in the nucleus decreases, while axon length and size of nucleus and nucleolus
增加 (García-Cabezas, Barbas, & Zikopoulos, 2018). Such gradual changes in cell morphol-
ogy are aligned with the overall degree of architectonic differentiation across cortical areas. 在
the human brain, this systematic architectonic variation observed across the cortex has been
directly linked to the timing of development (Barbas & García-Cabezas, 2016). Across species,
differences in spine head size, spine neck length, and spine density have been reported be-
tween mouse and human cortex (Benavides-Piccione, Ballesteros-Yáñez, DeFelipe, & Yuste,

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Integration of cortical macro- and microarchitecture with cortical connections. Less architectonically differentiated, agranular,
数字 4.
cortical areas (黄色的) are characterized by lower neuron density and different morphology of layer III pyramidal cells than more strongly
differentiated, eulaminate, 地区 (dark green), with gradual changes across the spectrum. (A) Macroscopic and microscopic architectonic
features show concerted changes along spatial cortical gradients, indicating a natural axis of cortical organization. 尤其, higher neuron
density tends to correlate with smaller cross sections of the soma and the dendritic tree as well as with lower total spine count and lower peak
spine density. (乙) Relations of architectonic types with connection features. Within cortical areas, the ratio of supra- versus infragranular soma
size of projection neurons tends to increase as one transitions from less to more differentiated areas (externopyramidization; Goulas et al.,
2018). Also note that projection neurons are displayed with relatively larger soma cross section than nonprojection neurons in the same cortical
area and layer. 重要的, connections exist predominantly between areas of similar cortical type, and agranular and dysgranular regions
(黄色的) tend to form more connections than eulaminate regions (dark green). Hence agranular and dysgranular regions tend to be part of the
network core, while eulaminate regions tend to be part of the network periphery (比照. 数字 2). 而且, laminar patterns of projection origins
are related to differences in architectonic differentiation. Connections between areas of distinct differentiation show a skewed unilaminar
projection pattern, with projections originating predominantly in the infragranular or supragranular layers depending on the direction of the
投影 (agranular to eulaminate projections and eulaminate to agranular projections, 分别), while connections between areas of
similar architectonic differentiation show a bilaminar projection origin pattern (connections between middle panels), where the dominating
laminar compartment again depends on the connected areas’ relative differentiation. 总共, there are concurrent changes of macro- 和
microstructural cellular and connectional features across the cortical sheet, forming spatially ordered gradients, conﬁrming and expanding
observations from classic neuroanatomy studies (gradation principle of Sanides, 1962). Panels adapted from Beul and Hilgetag (2019).

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2002). 更普遍, a successive increase in dendritic complexity has been reported from
New World monkeys to Old World monkeys to hominids (Bianchi et al., 2013; Elston, 2003,
2007; reviewed in Charvet & 芬莱, 2014). These observations are consistent with an overall
increase in neuron density as the length of developmental time schedules and brain size in-
折痕 (reviewed in Caviness, Bhide, & Nowakowski, 2008, and Charvet & 芬莱, 2014). 到
summarize, many features of cellular morphology seem to be tightly interlinked, correspond-
ing to the overall degree of architectonic differentiation as well as differences in developmental
定时. Together with this precise orchestration of cell speciﬁcation during ontogenesis, 哪个
results in morphological features of neurons being attuned to the architectonic differentiation
of an area as a whole, also the development of cortical connections appears to be closely cou-
pled to architectonic differentiation. In data from two tract-tracing studies probing the develop-
mental time course of projections within the visual cortex of the macaque monkey (Batardiere
等人。, 2002; 肯尼迪, Bullier, & Dehay, 1989), it can be observed that, even in the immature
(prenatal or neonate) cortex, the fraction of projection neurons originating in supragranular
layers is correlated with the difference in architectonic differentiation (as indicated by cortical
type or neuronal density) between connected areas, and that immature laminar patterns of
projection origins strongly correlate with eventual adult levels of supragranular contribution
(Beul et al., unpublished observation). These observations indicate that the architectonic type
principle successfully predicts the laminar origins of projections even at early stages of brain
发展. 所以, basic ontogenetic mechanisms likely underlie its emergence.

In recent simulation experiments (Beul, Goulas, & 希尔格塔格, 2018), we explored whether
spatiotemporal interactions in the forming cortical sheet could lead to the empirically observed
connectivity consistent with the architectonic type principle. In an in silico model of cortical
sheet growth and the concurrent formation of cortico-cortical connections, we systematically
varied the spatiotemporal trajectory of neurogenesis and the relation between architectonic dif-
ferentiation and time of origin of neural populations. We showed that, for realistic assumptions
about neurogenesis, successive tissue growth and stochastic connection formation interacted
to produce realistic cortico-cortical connectivity (数字 5). The implication is that precise
targeting of interareal connection terminations is not necessary to produce connectivity that
resembles real brain networks within a cortical hemisphere. Using classiﬁers trained on such
simulated cortico-cortical connection networks consistent with the architectonic type princi-
普莱, we could successfully predict empirically observed connectivity in two species, cat and
macaque. In similar simulations (Goulas, 贝策尔, & 希尔格塔格, 2019), we also demonstrated that
interactions of structured spatial gradients and developmental time windows during ontogeny
can explain the widely known features of homophily (Betzel et al., 2016) and distance depen-
dence of connection strength, as well as a host of empirically observed patterns of network
topology of vertebrate and invertebrate nervous systems. 总共, we demonstrated a possible
mechanism of how relative architectonic differentiation and central features of connectivity
become linked during development through spatiotemporal interactions (Beul et al., 2018),
which supports previously stated hypotheses about the mechanistic underpinnings of the ar-
chitectonic type principle (Barbas, 1986; Barbas, 2015; Hilgetag et al., 2016).

IMPLICATIONS OF THE ARCHITECTONIC TYPE PRINCIPLE FOR LARGE-SCALE
SIMULATIONS OF CORTICAL DYNAMICS

In addition to revealing wiring principles of the primate cerebral cortex, the exposed regu-
larities of cortical structure can be employed to construct large-scale computational models
of the cerebral cortex that are a unique tool for gaining novel insights into cortical dynamics
and function (数字 6). 尤其, these regularities, including the systematic association of

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An Architectonic Type Principle of the Primate Brain

数字 5. Developmental origins of the architectonic type principle. Summary of computational
modeling of the ontogenetic development of cortical architecture and connections (Beul et al.,
2018). The simulations indicate that the presence of two spatial origins of neurogenesis, 导致
two neurogenetic (颞) and architectonic gradients, is necessary for the close correspondence
of the in silico model to the empirical relations between connectivity and architectonic differentia-
的. 重要的, the empirically observed relations are replicated in silico only if the less-to-more
differentiated architectonic gradients align with early-to-late ontogenetic gradients. 因此, the sug-
gested mechanism is consistent with correspondence of time of neurogenesis to architectonic dif-
ferentiation (例如, Dombrowski, 希尔格塔格, & Barbas, 2001) and a dual origin of the cerebral cortex
(Pandya, Seltzer, Petrides, & Cipolloni, 2014; Sanides, 1962).

connectivity with cortical type or neuron density differences, enable connectomes underlying
dynamical network simulations to be derived from incomplete experimental connectivity data.
施密特, Bakker, 希尔格塔格, 等人. (2018) used this approach, predicting laminar origin patterns
of cortico-cortical connections from relative neuron densities of connected areas, to derive a
layer-resolved connectivity matrix for all vision-related areas in one hemisphere of macaque
cortex. 此外, the work exposed a close correlation between neuron density and corti-
cal thickness, which was used to estimate missing thickness data and to help determine neural
population sizes. As mentioned in the preceding, neurons in prefrontal cortices have a compar-
atively high number of dendritic spines in both humans and nonhuman primates (Bianchi et al.,
2013; Elston, 2003, 2007, 2011; Jacobs, 2001). This feature is part of a more general upward
gradient in the number of spines per neuron from high to low architectural types (Elston, 2002,
2003). The comparative constancy of the volume density of synapses across cortical areas
(Harrison, Hof, & 王, 2002) logically links the decrease in neuron density with the increase
in the number of spines per neuron across areas of different architectonic type (施密特, Bakker,
希尔格塔格, 等人。, 2018). 因此, the gradient of architectonic types and associated morphological
trends allow educated guesses for the full speciﬁcation of cortical network models.

Such speciﬁcation of complete connectivity graphs at the level of cortical areas and layers
enables network simulations taking into account the corresponding detailed connectivity, 作为
done by Schmidt, Bakker, 沉, 等人. (2018) for all vision-related areas in one hemisphere
of macaque cortex. This work studies resting-state activity in a network of interconnected mi-
crocircuits each with the full density of neurons and synapses, so that both the microscopic
spiking activity and the macroscopic activity at the level of areas can be directly compared with
experimental data. Good agreement with experimental observations was achieved simultane-
ously for microscopic and macroscopic activity at a metastable state of the network. The close

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An Architectonic Type Principle of the Primate Brain

数字 6. The architectonic type principle enables the generation of large-scale cortical models
that integrate microscopic and macroscopic cortical architecture and connections. Schematic rep-
resentation of a multiarea spiking model of macaque vision-related cortex, with laminar patterns of
cortico-cortical connectivity determined in part from relative neuron densities of connected areas.
Interarea and local connectivity together form polysynaptic pathways through the network. 数字
reproduced from Schmidt, Bakker, 希尔格塔格, 等人. (2018).

correspondence with experimental activity data provides additional support for the underlying
assumptions on the network structure. Such results, in conjunction with recent similar studies
(例如, Joglekar, Mejias, 哪个, & 王, 2018), showcase the need for computational models
embodying the graded changes of micro- and macrostructure of cortex for more thoroughly
explaining experimental observations at the functional level.

The fact that the architectonic type principle enables connectivity to be predicted not only
at the level of cortical areas, but also at the laminar level, helps to identify polysynaptic path-
ways through the multiarea cortical network. A necessary step for this identiﬁcation is to link
cortico-cortical to intrinsic connectivity, by mapping cortico-cortical synapses to their target
neurons and tracking the strongest pathways between areas that may pass through several inter-
mediate populations within the same area. Following this approach, 施密特, Bakker, 希尔格塔格,
等人. (2018) found that the strongest paths between areas of similar type are like feedforward
pathways in their start-to-end patterns, but like feedback pathways in terms of laminar patterns
in intermediate areas.

The association of denser connectivity with lower architectonic types carries with it dif-
ferences in spiking patterns of low- and high-type areas. 尤其, 施密特, Bakker, 沉,
等人. (2018) found low-type areas to be more prone to bursting, which implies generally longer
intrinsic time constants in line with a hierarchical organization of the width of single-neuron
autocorrelation functions (Murray et al., 2014). This contribution of differential connection
density to the hierarchy of intrinsic timescales may complement effects of area-speciﬁc recep-
tor densities (Duarte, Seeholzer, Zilles, & Morrison, 2017).

Various studies have shown that a hierarchical separation of timescales at the level of neu-
ral populations or cortical areas matches nested frequencies present in the sensory environ-
ment and in motor behavior (Gordon, Koenig-Robert, Tsuchiya, van Boxtel, & Hohwy, 2017;
Hasson, 哪个, Vallines, Heeger, & 鲁宾, 2008; Kiebel, Daunizeau, & 弗里斯顿, 2008; Victor &

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An Architectonic Type Principle of the Primate Brain

Purpura, 1996). These population- or area-level timescales mainly reﬂect correlations between
神经元, rather than single-neuron autocorrelations, as the number of correlations grows with
the square of the number of neurons (Hagen et al., 2016). Computational studies have linked
the hierarchical trend in connection density (Chaudhuri, Knoblauch, Gariel, 肯尼迪, & 王,
2015) or the topology of a rich-club core and less densely connected periphery (Gollo, 扎莱斯基,
和记黄埔, van den Heuvel, & Breakspear, 2015) to hierarchically organized timescales, 哪个
in turn likely relate to layer-speciﬁc high-frequency feedforward and low-frequency feedback
沟通 (Bastos et al., 2015; Mejias, 穆雷, 肯尼迪, & 王, 2016; Michalareas
等人。, 2016; van Kerkoerle et al., 2014). 然而, these studies represent each area using
coarse-grained equations, and thus do not distinguish between single-neuron and population-
level dynamics, which can be markedly different. Direct comparison with the experimentally
observed hierarchy of timescales in the sense of single-neuron autocorrelations (Murray et al.,
2014) requires model predictions at the level of individual neurons. 此外, proper si-
multaneous predictions of single-neuron dynamics and pairwise cross-correlations in neural
network models require using the full density of neurons and synapses (van Albada, Helias, &
Diesmann, 2015). As shown by Schmidt, Bakker, 希尔格塔格, 等人. (2018) and Schmidt, Bakker,
沉, 等人. (2018), connectivity matrices informed by the architectonic type principle can help
make such neuron-level predictions along with accurate predictions of large-scale dynamics.

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全面的, relationships between cortical types and their connectivity inform various aspects
of dynamic network simulations of the mammalian brain. For simulating the human brain,
where invasive connectivity data are not available, predictive connectomics is inevitable in
order to fully specify the network connectivity, implying even greater relevance of the archi-
tectonic type principle.

结论

Various aspects of macroscopic and microscopic cortical organization, such as architectonic
类型, cellular density, and size as well as dendritic size and spine density, are closely interre-
lated and present in spatially ordered gradients of cortical structure, deﬁning a natural axis of
cortical organization along which many macroscopic and microscopic cortical architectonic
features covary. 而且, these architectonic features are also related to the intrinsic cortical
circuitry, as well as to features of the extrinsic, cortico-cortical connections. 因此, the archi-
tectonic type principle, which may derive from basic properties of spatially and temporally
ordered cortical development, allows the integration of cortical architecture and connectiv-
ity across scales of organization, and provides speciﬁcations of multiscale models of cortical
dynamics. Despite these intriguing ﬁndings; 然而, we are still at the beginning of under-
standing all the developmental, 结构性的, and functional implications of this fundamental
principle of cortical organization.

致谢

We thank Helen Barbas and Miguel A. García-Cabezas for helpful comments on the manuscript.

作者贡献

调查; 监督;
克劳斯·C. 希尔格塔格: 概念化; 资金获取;
Writing – Original Draft; Writing – Review & Editing. Sarah F. Beul: 形式分析; Investiga-
的; 方法; 软件; 可视化; Writing – Review & Editing. Sacha J. van Albada:
概念化; 形式分析; 资金获取; 调查; 方法; Soft-

网络神经科学

919

An Architectonic Type Principle of the Primate Brain

器皿; 可视化; Writing – Review & Editing. Alexandros Goulas: 形式分析; 资金
acquisition; 调查; 方法; Writing – Review & Editing.

资金信息

Alexandros Goulas, Alexander von Humboldt Foundation, Humboldt Research Fellowship.
克劳斯·C. 希尔格塔格, Human Brain Project, 奖项ID: HBP/SGA2. 克劳斯·C. 希尔格塔格, 德语
Research Council DFG, 奖项ID: SFB 936/A1. 克劳斯·C. 希尔格塔格, German Research Council
DFG, 奖项ID: TRR 169/A2. Sacha J. van Albada, German Research Council DFG, 奖
ID: SPP 2041. 克劳斯·C. 希尔格塔格, German Research Council DFG, 奖项ID: SPP 2041, HI
1286/7-1.

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