Ahmed B, Hammond P
Exp Brain Res. 1984;53(2):444-50. doi: 10.1007/BF00238174.
Responses of retinal ganglion cells to motion of large fields of visual texture were recorded in the lightly anaesthetised, immobilized cat. Brisk sustained and brisk transient, on- or off-centre, units gave a modulated response to texture motion. The pattern of temporal modulation of the response was dependent upon the particular configuration (sample) of texture crossing the receptive field. The magnitude of the response depended on the size of the receptive field centre. For all units, whether sustained or transient the magnitude of response to a textured field of fixed angular subtense declined as centre-diameter increased from 0.9 deg. For brisk units the response magnitude levelled off for centre sizes smaller than 0.9 deg. Responses to texture were confined spatially to the region of the receptive field, and the overall characteristics of this response were due to interactions between the centre and surround mechanisms of the receptive field. In brisk transient units, no evoked response was evident when texture motion was confined to regions well away from the receptive field of the unit, i.e. no periphery or shift effect could be demonstrated. The results support previous suggestions that the differential sensitivity to texture motion evident in cortical neurones must be due to intra-cortical processing.
在轻度麻醉、固定的猫身上记录视网膜神经节细胞对大面积视觉纹理运动的反应。快速持续型和快速瞬变型、中心开或中心闭的神经元对纹理运动给出调制反应。反应的时间调制模式取决于穿过感受野的纹理的特定构型（样本）。反应的幅度取决于感受野中心的大小。对于所有神经元，无论持续型还是瞬变型，当中心直径从0.9度增加时，对固定视角张角的纹理区域的反应幅度都会下降。对于快速神经元，当中心尺寸小于0.9度时，反应幅度趋于平稳。对纹理的反应在空间上局限于感受野区域，并且这种反应的总体特征是由于感受野中心和周边机制之间的相互作用。在快速瞬变神经元中，当纹理运动局限于远离该神经元感受野的区域时，没有明显的诱发反应，即没有显示出外周或移位效应。这些结果支持了先前的观点，即皮层神经元中对纹理运动的差异敏感性必定归因于皮层内处理。
