Immature cortex lesions alter retinotopic maps and interhemispheric connections.

Abstract:

:Unilateral lesions of the occipital visual areas performed on postnatal day 5 (P5) in the ferret are not compensated by the appearance, in the lesioned hemisphere, of visual responses at ectopic locations. Instead, when parts of the visual areas are spared, they show abnormal retinotopic organizations; furthermore, callosal connections are abnormally distributed in relation to the retinotopic maps. Lesions that completely eliminate the visual areas including the posterior parietal cortex cause the appearance of abnormal callosal connections from the primary somatosensory cortex on the lesion side to the contralateral, intact, posterior parietal cortex. The occipital visual areas (17, 18, 19, and 21) of the intact hemisphere show a normal retinotopy but lose callosal connections in territories homotopic to the lesions. These findings clarify the nature and limits of structural developmental plasticity in the visual cortex. Early in life, certain regions of cortex have been irreversibly allocated to the visual areas, but two properties defining the areas, that is, retinotopy and connections, remain modifiable. The findings might be relevant for understanding the consequences of early-onset visual cortical lesions in humans.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Restrepo CE,Manger PR,Spenger C,Innocenti GM

doi

10.1002/ana.10591

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

51-65

issue

1

eissn

0364-5134

issn

1531-8249

journal_volume

54

pub_type

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