Recurrent networks in human visual cortex: psychophysical evidence

被引:38
作者
Adini, Y [1 ]
Sagi, D [1 ]
机构
[1] Weizmann Inst Sci, Dept Neurobiol, IL-76100 Rehovot, Israel
来源
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION | 2001年 / 18卷 / 09期
关键词
D O I
10.1364/JOSAA.18.002228
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
To study the neuronal circuitry underlying visual spatial-integration processes, we measured the effect of short and long chains of proximal Gabor-signal (GS) flankers ( sigma = lambda = 0.15 degrees) on the contrast-discrimination function of a foveal GS target. We found that the same pattern of lateral masks enhanced target detection with low-contrast pedestals and strongly suppressed the discrimination of a range of intermediate pedestal contrasts (pedestal contrast < 30%). Increasing the number of the flankers reversed the suppressive effect. The data suggest that the main influence of the proximal flankers is maintained by activity-dependent interactions and not by linear spatial summation. With an increased number of flankers, we found a nonmonotonic relationship between the discrimination thresholds and the number of flankers, supporting the notion that the discrimination thresholds are mediated by excitatory-inhibitory recurrent networks that manifest the dynamics of large neuronal populations in the neocortex. (C) 2001 Optical Society of America.
引用
收藏
页码:2228 / 2236
页数:9
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