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Comparative development of cell properties in cortical area 18 of normal and dark-reared kittens.

Abstract：

:The development of visual cell properties was studied in cortical Area 18 (A18) of normal (NRs) and dark-reared kittens (DRs), from 2 weeks of age to adulthood. In addition to the orientation selective (S) and non-selective (NS) cells, we describe a new type of non-selective cell with a peripheral zone (NSp), which could be either an intermediate form between NS and S cells and included in a sequential model or an immature form of the S cells whose responses are affected by peripheral stimulations. Using accurate coordinates for the area centralis position relative to the optic disc projection as a function of age, we show that: a) the extent of the visual field increases with age in DRs and NRs; b) the retinotopic organization is always present; c) receptive fields, large in the NS cells, reduce to the size of mature S cells as soon as the cells acquire orientation selectivity. This process can occur after only 6 h of visual experience; d) velocity preference shifts toward high velocities, though more so in NRs than in DRs. An interpretation of the development of these properties is proposed, taking into account eye growth, the growth of dendritic fields and the formation of new connections. A comparison with previous results obtained in Area 17 (A17) shows a similar time course of the specification (NRs) and of the despecification (DRs) processes, although the development of A18 is postponed by about 2 weeks. Moreover, the "adult-like" binocular distribution of ocular dominance depends upon visual experience in A18, while it does not in A17.

journal_name

Exp Brain Res

journal_title

Experimental brain research

authors

Milleret C,Gary-Bobo E,Buisseret P

doi

10.1007/BF00247518

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

8-20

issue

1

eissn

0014-4819

issn

1432-1106

journal_volume

71

pub_type

杂志文章

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