Faculty Articles
Title
Postnatal development of disparity sensitivity in visual area 2 (v2) of macaque monkeys
ISBN or ISSN
0022-3077
Volume
100
Issue
5
Publication Date / Copyright Date
11-1-2008
First Page
2486
Last Page
2495
DOI Number
10.1152/jn.90397.2008
Abstract
Macaque monkeys do not reliably discriminate binocular depth cues until about 8 wk of age. The neural factors that limit the development of fine depth perception in primates are not known. In adults, binocular depth perception critically depends on detection of relative binocular disparities and the earliest site in the primate visual brain where a substantial proportion of neurons are capable of discriminating relative disparity is visual area 2 (V2). We examined the disparity sensitivity of V2 neurons during the first 8 wk of life in infant monkeys and compared the responses of V2 neurons to those of V1 neurons. We found that the magnitude of response modulation in V2 and V1 neurons as a function of interocular spatial phase disparity was adult-like as early as 2 wk of age. However, the optimal spatial frequency and binocular response rate of these disparity sensitive neurons were more than an octave lower in 2- and 4-wk-old infants than in adults. Consequently, despite the lower variability of neuronal firing in V2 and V1 neurons of infant monkeys, the ability of these neurons to discriminate fine disparity differences was significantly reduced compared with adults. This reduction in disparity sensitivity of V2 and V1 neurons is likely to limit binocular depth perception during the first several weeks of a monkey's life.
Disciplines
Optometry
NSUWorks Citation
Maruko, Ichiro; Zhang, Bin; Tao, Xiaofeng; Tong, J.; Smith, Earl L. III; and Chino, Yuzo M., "Postnatal development of disparity sensitivity in visual area 2 (v2) of macaque monkeys" (2008). Faculty Articles. 15.
https://nsuworks.nova.edu/hpd_opt_facarticles/15
