视觉刺激对猴初级视皮层神经元眼球位置效应的影响

INFLUENCE OF VISUAL STIMULI ON EYE-POSITION RELATED ACTIVITIES OF NEURONS IN PRIMARY VISUAL CORTEX(V1) OF AWAKE MONKEYS

用细胞外记录的方法，研究了视觉刺激对清醒猴初级视皮层神经元眼球位置效应的影响。当猴注视电视屏幕上25个下同位置的小光点（注视点）时，在屏幕上分别给予两种不同形式的视觉刺激：注视点周围的闪烁圆环和感受野内的移动光条。这两种刺激都能增强初级视皮层神经元的眼球位置相关活动，并相应地使受眼球位置调制的神经元的比例明显增加。以上结果表明，视皮层的第一级神经元已经可以对视觉信息和眼球位置信息进行整合。

Extracellular recordings were made in the primary visua1 cortex (V1 ) in two awake monkeys to test the influence of visual stimuli on the eye-position related activites of the neurons. While the monkeys gazed on a fixation point (FP) positioned sequentially at different locations on a TV screen, two types of visual stimuli were presented on the same screen: (1) A small light ring flashed repeatedly around the FP or(2) A prefered light bar shifted continuously across the cell' s receptive field (RF).Both stimuli significantly enhanced the eye-position related activities and correspondingly increased the incidence of the eye-position dependent neurons. The results show thatthe integration of information on vision and on eye position may tuke place at quite theearliest stage of the visual cortices.