Zhao Bin, Chen Hui, Li Bing
State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China.
Neuroreport. 2005 May 12;16(7):721-6. doi: 10.1097/00001756-200505120-00013.
Single neurons in the superior colliculus of the cat were tested for their direction-tuning responses to random-line patterns composed of identical short lines moving obliquely to their common orientation. A substantial population of cells responded primarily to the veridical direction of pattern motion while a few were sensitive to the orientation of component lines. Moreover, for most cells, the pattern motion sensitivity decreased when the orientation element was enhanced by elongating the component lines in stimulus. Further analysis found that the initial transient responses after stimulus onset were relatively more sensitive to component motion than the subsequent sustained responses. These findings suggest that the superior colliculus is involved in the higher-order analysis of visual motion so that collicular neurons can signal coherent pattern motion in many cases.
对猫上丘中的单个神经元进行了测试，以检测它们对由相同短线组成的随机线条图案的方向调谐反应，这些短线相对于其共同方向倾斜移动。大量细胞主要对图案运动的真实方向作出反应，而少数细胞对组成线条的方向敏感。此外，对于大多数细胞，当通过延长刺激中的组成线条来增强方向元素时，图案运动敏感性会降低。进一步分析发现，刺激开始后的初始瞬态反应比随后的持续反应对组成部分的运动相对更敏感。这些发现表明，上丘参与视觉运动的高阶分析，以便在许多情况下，丘神经元能够发出连贯图案运动的信号。
