Velocity sensitivity and directional selectivity of frog retinal ganglion cells depend on chromaticity of moving stimuli.
Velocity sensitivity and directional selectivity of frog retinal ganglion cells depend on chromaticity of moving stimuli.
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青蛙视网膜神经节细胞的速度敏感性和方向选择性取决于移动刺激的色度。
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发表时间：
1985
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通讯作者：
S. Langeveld
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作者：
U. Grüsser‐Cornehls;S. Langeveld
在蛙视顶盖浅层记录到单个传入视神经纤维的动作电位。水平移动彩色刺激。施加大范围的刺激速度和2或3种不同波长（450、500或580 nm）的移动单色光斑。第三类神经元的速度函数随着颜色刺激的不同而略有变化。我们的样本中大约有一半的神经元表现出对一个或两个波长的方向选择性。在这些神经元的方向选择性被发现在整个速度范围内研究（0.046-18.4度X s-1），而在其他人也依赖于角速度的移动色点。因此，一个新的原则，彩色信号处理存在于青蛙，迄今尚未在其他动物中描述：方向选择性之间的相互关系，彩色成分的刺激和角速度。我们从这些发现中得出结论，当刺激仅限于非彩色灰阶时，顶盖细胞的分析特性（就其在模式识别中可能的功能而言）可能没有得到充分的描述。另一方面，我们想强调的是，青蛙的视网膜颜色通道的特殊性质，方向选择性和不同的时间常数的恢复功能，有助于处理黑色/白色刺激根据其形状，大小和速度，因为响应的前沿和后沿穿越感受野取决于这些因素。
Action potentials of single afferent optic-nerve fibers were recorded in the superficial layers of the optic tectum of frogs. Horizontally moving chromatic stimuli were applied. A large range of stimulus velocities and 2 or 3 different wavelengths (450, 500 or 580 nm) of the moving monochromatic light spots were applied. The velocity functions of class 3 neurons varied only slightly with different chromatic stimuli. About half of the neurons of our sample exhibited directional selectivity to one or two of the wavelengths investigated. In some of these neurons the directional selectivity was found over the entire velocity range studied (0.046-18.4 degrees X s-1), while in others it was also dependent upon the angular velocity of the moving chromatic spot. Thus, a new principle of chromatic-signal processing exists in frogs which has so far not been described in other animals: an interrelation between directional selectivity, chromatic composition of the stimulus and angular velocity. We concluded from these findings that the analytic properties of tectal cells, with respect to their possible function in pattern recognition, might receive insufficient description when the stimuli are restricted to the achromatic grey scale. On the other hand, we would like to stress that the peculiar properties of the retinal color channels in frogs, directional selectivity and different time constants of the recovery functions, contribute to the processing of black/white stimuli according to their shape, size and velocity, since the response to the leading edge and the trailing edge traversing the receptive field depends on these factors.