Levels of homology and the problem of neocortex.

Abstract:

:The neocortex is found only in mammals, and the fossil record is silent on how this soft tissue evolved. Understanding neocortex evolution thus devolves to a search for candidate homologous neocortex traits in the extant nonmammalian amniotes. The difficulty is that homology is based on similarity, and the six-layered neocortex structure could hardly be more dissimilar in appearance from the nuclear organization that is so conspicuous in the dorsal telencephalon of birds and other reptiles. Recent molecular data have, however, provided new support for one prominent hypothesis, based on neuronal circuits, that proposes the principal neocortical input and output cell types are a conserved feature of amniote dorsal telencephalon. Many puzzles remain, the greatest being understanding the selective pressures and molecular mechanisms that underlie such tremendous morphological variation in telencephalon structure.

journal_name

Annu Rev Neurosci

authors

Dugas-Ford J,Ragsdale CW

doi

10.1146/annurev-neuro-071714-033911

subject

Has Abstract

pub_date

2015-07-08 00:00:00

pages

351-68

eissn

0147-006X

issn

1545-4126

journal_volume

38

pub_type

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