中央凹
明视
放大倍数
空间频率
光学
闪烁
规范化(社会学)
亮度
对比度(视觉)
心理物理学
周边视觉
视野
物理
总和
心理学
视网膜
神经科学
视网膜
计算机科学
眼科
医学
刺激
社会学
人类学
感知
操作系统
作者
Veijo Virsu,Jyrki Rovamo,Pentti Laurinen,Risto Näsänen
出处
期刊:Vision Research
[Elsevier]
日期:1982-01-01
卷期号:22 (9): 1211-1217
被引量:132
标识
DOI:10.1016/0042-6989(82)90087-6
摘要
We measured temporal and spatial contrast sensitivity functions of foveal and peripheral photopic vision at various locations in the nasal visual field. Sensitivity decreased monotonically with increasing eccentricity when it was measured by using the same test gratings at different eccentricities. When the gratings were normalized in area, spatial frequency, and translation velocity by means of the cortical magnification factor M so that the calculated cortical representations of the gratings became equivalent at different eccentricities, the temporal contrast sensitivity functions became similar at all eccentricities. The normalization was effective under all experimental conditions that included various kinds of temporal modulation from 0 to 25 Hz (movement, counterphase flicker and on-off flicker) and different threshold tasks (detection, orientation discrimination, and discrimination of movement direction), independently of the subjective appearances of the gratings at threshold. We conclude that central and peripheral vision are qualitatively similar in spatiotemporal visual performance. The quantitative differences observed without normalization seem to be caused by the spatial sampling properties of retinal ganglion cells that are directly related to the values of M used in the normalization.
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