The visual cortical association field:: A Gestalt concept or a psychophysiological entity?
The visual cortical association field:: A Gestalt concept or a psychophysiological entity?
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DOI：
10.1016/s0928-4257(00)01096-2
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发表时间：
2000-09-01
影响因子：
--
通讯作者：
Frégnac, Y
中科院分区：
文献类型：
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作者：
Chavane, F;Monier, C;Frégnac, Y
视觉神经元的感受野被经典地定义为视觉刺激引起其放电活动变化的空间（或视网膜）区域。在猫17区的细胞内记录表明，视觉诱发的突触整合领域扩展到一个更大的面积比建立在穗活动的基础上。突触去极化（显性兴奋）的强度降低的刺激，散列在距离放电场的中心增加的距离，而他们的发病潜伏期增加。这些电生理数据的详细的时空分析表明，阈下突触反应中观察到的“沉默”周围的皮层感受野的结果从皮层内传播的激活波进行缓慢进行水平轴突内初级视觉皮层。他们还预测，当由视网膜中的运动信号产生的前馈激活在初级视觉皮层中与视觉诱导的水平激活传播同相时，可能会发生感知促进。已经在人类中获得了心理物理相关性，显示出由共线的Gabor贴片序列产生的明显运动，已知优先激活VI方向选择性细胞，被人类观察者感知为比相同物理速度的非共线序列快得多。(C)2000 Elsevier Science Ltd.由Editions scientifiques et medicales Elsevier SAS出版。
The receptive field of a visual neurone is classically defined as the region of space (or retina) where a visual stimulus evokes a change in its firing activity. Intracellular recordings in cat area 17 show that the visually evoked synaptic integration field extends over a much larger area than that established on the basis of spike activity. Synaptic depolarizing (dominant excitation) decreases in strength for stimuli that are hashed at increasing distances away from the centre of the discharge field, while their onset latency increases. A detailed spatio-temporal analysis of these electrophysiological data shows that subthreshold synaptic responses observed in the 'silent' surround of cortical receptive fields result from the intracortical spread of activation waves carried by slowly conducting horizontal axons within primary Visual cortex. They also predict that a perceptual facilitation may occur when feedforward activation produced by the motion signal in the retina travels in phase in the primary Visual cortex with the visually induced spread of horizontal activation. A psychophysical correlate has been obtained in humans, showing that apparent motion produced by a sequence of co-linear Gabor patches, known to preferentially activate VI orientation selective cells, are perceived by human observers as much faster than non co-linear sequences of the same physical speed. (C) 2000 Elsevier Science Ltd. Published by Editions scientifiques et medicales Elsevier SAS.