Cortical dynamics of lateral inhibition: Visual persistence and ISI
Cortical dynamics of lateral inhibition: Visual persistence and ISI
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DOI：
10.3758/bf03206836
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发表时间：
1996-10-01
期刊：
影响因子：
--
通讯作者：
Francis, G
中科院分区：
文献类型：
--
作者：
Francis, G
心理物理学研究表明，增加两次刺激之间的刺激间隔 (ISI) 会降低第一个刺激的持久性。虽然一些研究人员用瞬时抑制和持续抑制的相互作用来解释这些结果，但本文描述了另一种解释。在称为边界轮廓系统的边界检测神经网络模型中，持久性是反馈生成混响的结果。控制这些混响的机制包括侧向抑制，计算机模拟显示侧向抑制可以使网络中的持久性与心理物理数据定性匹配。其他模拟预测，增加第二个刺激的持续时间应该会导致持久性随着 ISI 的增加而增加。该模型将视觉暂留的心理物理数据与空间视觉的计算要求和视觉皮层细胞的特性联系起来。
Psychophysical studies show that increasing the interstimulus interval (ISI) between two stimuli decreases persistence of the first stimulus. While some researchers account for these results with interactions of transient and sustained inhibition, this paper describes an alternative explanation. In a neural-network model of boundary detection called the boundary contour system, persistence is the result of feedback-generated reverberations. Mechanisms to control these reverberations include lateral inhibition, which computer simulations show allows persistence in the network to qualitatively match the psychophysical data Additional simulations predict that increasing the duration of the second stimulus should cause persistence to increase with ISI. The model links psychophysical data on visual persistence with computational requirements of spatial vision and properties of cells in visual cortex.