test of zone activity hypothesis II

我们记录了麻醉猫对大视野视觉模式运动作出反应的绒毛状浦肯野细胞的CS活动和伴随的简单棘波(SS)活动。根据方向选择性的不同，我们将细胞分为两大类：水平刺激和偏爱垂直刺激的垂直类型。横型细胞的CS活性在对向记录部位的刺激中增加，在同侧方向的刺激中降低，而垂直型细胞的CS活性在向上刺激时增加，在向下刺激时降低。在这两种类型中，CS反应在低速刺激下较大，而在较高速度刺激下维持良好，高达180ﾟ/S。大多数水平型细胞被呈现给任一只眼的刺激所调制，并且优势眼与记录位置同侧。大多数垂直型细胞也受到呈现给双眼的刺激的调制，双眼之间没有明显的差异。同侧眼的感受野始终包括中央区，并广泛延伸至双侧视野。CS和SS的反应是相互作用的，即当CS放电增加时，SS放电减少，反之亦然。

We recorded the CS activity together with concomitant simple spike (SS) activity of the floccular Purkinje cells that responded to large-field visual pattern movement in the anesthetized cat. On the basis of the direction selectivity, we divided the cells into two major types : the horizontal stimuli and the vertical type that preferred vertical stimuli. The CS activity of the horizontal type cell increased during stimuli directed contralaterally to the recording site and decreased during ipsilaterally directed stimuli, while that of the vertical type cell increased during upward stimuli and decreased during downward stimuli. In both types, the CS response was larger at lower velocity stimuli, and the response was well maintained at higher velocity stimuli up to 180 ﾟ/s tested. The majority of the horizontal type cells were modulated by the stimuli presented to either eye, and the dominant eye was ipsilateral to the recording site. The majority of the vertical type cells were also modulated by the stimuli presented to either eye without obvious differences between two eyes. The receptive field of the ipsilateral eye always included the area centralis and extended widely on both visual hemifields. The CS and SS responses were reciprocal to each other, that is, when the CS firing increased, the SS firing decreased and vice versa.