视觉皮层神经元速度选择性的转变：感知运动对比度的神经基础。
Shift in speed selectivity of visual cortical neurons: a neural basis of perceived motion contrast.
作者信息
Li C Y, Lei J J, Yao H S
机构信息
Chinese Institute of Neuroscience, 320 Yue-Yang Road, Shanghai 200031, China.
出版信息
Proc Natl Acad Sci U S A. 1999 Mar 30;96(7):4052-6. doi: 10.1073/pnas.96.7.4052.
Abstract
The perceived speed of motion in one part of the visual field is influenced by the speed of motion in its surrounding fields. Little is known about the cellular mechanisms causing this phenomenon. Recordings from mammalian visual cortex revealed that speed preference of the cortical cells could be changed by displaying a contrast speed in the field surrounding the cell's classical receptive field. The neuron's selectivity shifted to prefer faster speed if the contextual surround motion was set at a relatively lower speed, and vice versa. These specific center-surround interactions may underlie the perceptual enhancement of speed contrast between adjacent fields.
摘要
视野中某一部分的运动感知速度会受到其周围区域运动速度的影响。对于导致这种现象的细胞机制，我们知之甚少。对哺乳动物视觉皮层的记录显示，通过在细胞经典感受野周围区域显示对比速度，可以改变皮层细胞的速度偏好。如果背景周边运动设置为相对较低的速度，神经元的选择性会转向偏好更快的速度，反之亦然。这些特定的中心 - 周边相互作用可能是相邻区域之间速度对比的感知增强的基础。
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