Behavioral and Brain Sciences 26 (5):535-552 (2003)

Authors
Abstract
The isocortex is a distinctive feature of mammalian brains, which has no clear counterpart in the cerebral hemispheres of other amniotes. This paper speculates on the evolutionary processes giving rise to the isocortex. As a first step, we intend to identify what structure may be ancestral to the isocortex in the reptilian brain. Then, it is necessary to account for the transformations (developmental, connectional, and functional) of this ancestral structure, which resulted in the origin of the isocortex. One long-held perspective argues that part of the isocortex derives from the ventral pallium of reptiles, whereas another view proposes that the isocortex originated mostly from the dorsal pallium. We consider that, at this point, evidence tends to favor correspondence of the isocortex with the dorsal cortex of reptiles. In any case, the isocortex may have originated partly as a consequence of an overall “dorsalizing” effect (that is, an expansion of the territories expressing dorsal-specific genes) during pallial development. Furthermore, expansion of the dorsal pallium may have been driven by selective pressures favoring the development of associative networks between the dorsal cortex, the olfactory cortex, and the hippocampus, which participated in spatial or episodic memory in the early mammals. In this context, sensory projections that in reptiles end in the ventral pallium, are observed to terminate in the isocortex (dorsal pallium) of mammals, perhaps owing to their participation in these associative networks. Key Words: basolateral amygdala; claustrum; Emx-1; endopiriform nucleus; dorsal cortex; dorsal ventricular ridge; hippocampus; homology; olfactory cortex; Pax-6; ventral pallium.
Keywords basolateral amygdala   claustrum   Emx-1   endopiriform nucleus   dorsal cortex   dorsal ventricular ridge   hippocampus   homology   olfactory cortex   Pax-6   ventral pallium
Categories (categorize this paper)
DOI 10.1017/s0140525x03000128
Options
Edit this record
Mark as duplicate
Export citation
Find it on Scholar
Request removal from index
Revision history

Download options

PhilArchive copy


Upload a copy of this paper     Check publisher's policy     Papers currently archived: 63,133
Through your library

References found in this work BETA

No references found.

Add more references

Citations of this work BETA

Solving the “Human Problem”: The Frontal Feedback Model.Raymond A. Noack - 2012 - Consciousness and Cognition 21 (2):1043-1067.

Add more citations

Similar books and articles

Toward the Answer, but Still Far to Go.Toru Shimizu - 2003 - Behavioral and Brain Sciences 26 (5):569-570.
Cortical Evolution: No Expansion Without Organization.Hans Supèr - 2003 - Behavioral and Brain Sciences 26 (5):570-571.
The Dorsal Thalamic Connection in the Origin of the Isocortex.Salvador Guirado - 2003 - Behavioral and Brain Sciences 26 (5):557-558.
The Origin of the Amniote Sensory and Motor Cortices.Fernando Martinez-Garcia - 2003 - Behavioral and Brain Sciences 26 (5):561-563.
More Dorsal Cortex, Yes, but What Flavor?Alessandro Treves - 2003 - Behavioral and Brain Sciences 26 (5):571-572.
Pointing the Way to a Unified Theory of Action and Perception.Mel Goodale - 1997 - Behavioral and Brain Sciences 20 (4):749-750.

Analytics

Added to PP index
2009-01-28

Total views
66 ( #161,619 of 2,448,227 )

Recent downloads (6 months)
1 ( #451,050 of 2,448,227 )

How can I increase my downloads?

Downloads

My notes