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Developmentally induced loss of direction-selective neurons in the cat's lateral suprasylvian visual cortex

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Abstract

Single-cell recordings were carried out in the posteromedial lateral suprasylvian (PMLS) visual cortex of cats reared in an environment illuminated by 8-Hz stroboscopic flashes. These cats had a reduced proportion of direction-selective cells (8%) compared to PMLS cortex of normal cats (79%). Other receptive-field properties and ocular dominance of the neurons appeared normal. These results have implications for understanding the mechanisms of PMLS-cortex development and for interpreting behavioral studies of strobe-reared cats.

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    2002, Vision Research
    Citation Excerpt :

    This experimental condition preserves patterned input but eliminates motion signals (both signals associated with self-produced motion and motion in the environment) on the retina of both eyes. Such rearing causes marked reductions in the ability to discriminate the direction of motion of gratings, and causes a dramatic reduction in directionally-selective neurons in both the striate cortex (Cynader & Chernenko, 1976; Kennedy & Orban, 1983; Cremieux, Orban, Duysens, & Amblard, 1987) and in the lateral suprasylvian cortex––an area analogous to area MT in human and nonhuman primates (Spear, Tong, McCall, & Pasternak, 1985). Together these findings suggest that, at least in cats, reductions in the number of directionally selective neurons after motion deprivation cause deficits in the visual discrimination of the direction of motion.

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