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On the Possible Shapes of the Brain

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The great central dome of St Mark’s Cathedral in Venice presents in its mosaic design a detailed iconography expressing the mainstays of Christian faith. Three circles of figures radiate out from a central image of Christ: angels, disciples, and virtues. Each circle is divided into quadrants, even though the dome itself is radially symmetrical in structure. Each quadrant meets one of the four spandrels in the arches below the dome. Spandrels – the tapering triangular spaces formed by the intersection of two rounded arches at right angles – are necessary architectural by-products of mounting a dome on rounded arches.

SJ Gould and RC Lewontin (1979)

Abstract

The human brain is unique among primates in its complexity and variability. Here I argue that this variability is, however, strongly constrained by developmental processes common to all mammals. Comparative analyses of grey and white matter volume, cortical surface area and cortical folding show that the rostro–caudal axis of the central nervous system is a main direction along which mammalian neuroanatomical diversity is organised. Phylogenetically, rostral structures are often disproportionately larger and more differentiated in large mammals compared with small ones. Ontogenetically, caudal structures differentiate earlier but show less variation among species than rostral structures, which differentiate later and for a longer period. Theoretical considerations suggest that growth oriented along the rostro–caudal axis should produce non-linear differences in white matter volume and cortical folding. Growth appears then as a fundamental parameter to understand mammalian neuroanatomical variability, whose effects should be common to all species. This seems to be indeed the case for humans: the volume of different brain structures as well as changes in the extension and folding of the cerebral cortex resemble the trends observed across mammals. A strong global pattern of coordinated variability emerges, where differences in total brain volume are non-linearly related to local neuroanatomical changes. Finally, I review evidence suggesting that the changes related to this global pattern of variability may have an influence on the organisation of behaviour, modulating the development of certain cognitive traits or even affecting the susceptibility to psychiatric disorders.

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  1. Human Genetics and Cognitive Functions, Institut Pasteur, 25, rue du Docteur Roux, 75015, Paris, France

    Roberto Toro

  2. CNRS URA 2182 “Genes, synapses and cognition”, Institut Pasteur, Paris, France

    Roberto Toro

  3. Human Genetics and Cognitive Functions, Université Paris Diderot, Sorbonne Paris Cité, Paris, France

    Roberto Toro

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Toro, R. On the Possible Shapes of the Brain. Evol Biol 39, 600–612 (2012). https://doi.org/10.1007/s11692-012-9201-8

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