Faculty Proceedings, Presentations, Posters, Speeches, Lectures, etc.
Title
Development of Temporal Response Properties of Neurons in the Primary Visual Cortex (v1) and Visual Area 2 (v2) of Macaque Monkeys
Format
Poster
ISBN or ISSN
0146-0404
Conference Title
Association for Research in Vision and Ophthalmology Annual Meeting
Organization/Association/Group
Association for Research in Vision and Ophthalmology
Publication Title
Investigative Ophthalmology and Vision Science
Volume
47
Issue
13
Publication Date / Copyright Date
5-1-2006
First Page
5366
Publisher
Association for Research in Vision and Ophthalmology
Abstract
Purpose: : New born and young human infants have poor sensitivity to temporally modulating stimuli (e.g., Rasengane et al, 1997; Swanson and Birch, 1991; Dopkins et al, 1999; but see Regal 1981). The cortical mechanisms that may limit infant's visual performance in temporal domain have not been systematically explored. In this study, therefore, we investigated the relative maturation of temporal frequency tuning characteristics and parallel changes in visual latency of V1 and V2 neurons.
Methods: : At 2–, 4– and 8–weeks of age, microelectrode recording experiments were conducted in both V1 and V2. Drifting sine wave gratings (contrast = 40–80%) were used as stimuli. After optimizing stimulus orientation, size, and spatial frequency for each unit, we measured neuron's responsiveness as a function of stimulus temporal frequencies. Response latency was measured by determining the time between stimulus onset and the time at which unit's response significantly exceeded the noise level over 3 consecutive bins.
Results: : Optimal temporal frequencies and temporal resolutions of both V1 and V2 units in infant monkeys, except for V1 of 8–week–old infants, were significantly lower than those in adults. Response latencies of both V1 and V2 neurons in infant monkeys, except for V1 of 8–week–old infants, were significantly longer than those in adults. Unlike in adults, however, the response latencies of individual neurons in infant monkeys were not correlated with their temporal resolutions. In infant monkeys, both V1 and V2 neurons exhibited stronger response adaptation during the sustained responses compared to that in adults.
Conclusions: : The present results are consistent with the psychophysical observations that temporal contrast sensitivity of human infants is immature as late as 8 months of age (roughly equivalent to 8 weeks of age in monkeys). Also the present findings add new evidence for the hypothesis that the functional maturation of the primate visual brain proceeds in a hierarchical manner (Movshon and Kiorpes, 2003; Zhang et al, 2005).
Disciplines
Optometry
Keywords
visual cortex, development, receptive fields
NSUWorks Citation
Nakatsuka, C.; Zhang, Bin; Bi, Hua; Watanabe, Ichiro; Zheng, Jianghe; Lin, Y.; Smith, Earl L. III; and Chino, Yuzo M., "Development of Temporal Response Properties of Neurons in the Primary Visual Cortex (v1) and Visual Area 2 (v2) of Macaque Monkeys" (2006). Faculty Proceedings, Presentations, Posters, Speeches, Lectures, etc.. 15.
https://nsuworks.nova.edu/hpd_opt_facpres/15