Abstract
Structural connectivity among cortical areas provides the substrate for information exchange in the cerebral cortex and is characterized by systematic patterns of presence or absence of connections. What principles govern this cortical wiring diagram? Here, we investigate the relation of physical distance and cytoarchitecture with the connectional architecture of the mouse cortex. Moreover, we examine the relation between patterns of ipsilateral and contralateral connections. Our analysis reveals a mirrored and attenuated organization of contralateral connections when compared with ipsilateral connections. Both physical distance and cytoarchitectonic similarity of cortical areas are related to the presence or absence of connections. Notably, our analysis demonstrates that the combination of these factors relates better to cortico-cortical connectivity than each factor in isolation and that the two factors relate differently to ipsilateral and contralateral connectivity. Physical distance is more tightly related to the presence or absence of ipsilateral connections, but its relevance greatly diminishes for contralateral connections, while the contribution of cytoarchitectonic similarity remains relatively stable. Our results, together with similar findings in the cat and macaque cortex, suggest that a common set of principles underlies the macroscale wiring of the mammalian cerebral cortex.
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Acknowledgments
This work was supported by a Humboldt research fellowship from the Alexander von Humboldt Foundation to AG and funding by the German Research Council DFG to CCH (SFB 936/A1,Z3; TRR169/A2). The authors declare no competing financial interests.
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Goulas, A., Uylings, H.B.M. & Hilgetag, C.C. Principles of ipsilateral and contralateral cortico-cortical connectivity in the mouse. Brain Struct Funct 222, 1281–1295 (2017). https://doi.org/10.1007/s00429-016-1277-y
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DOI: https://doi.org/10.1007/s00429-016-1277-y