Lazareva N A, Tsutskiridze D Iu, Shevelev I A, Novikova R V, Tikhomirov A S, Sharaev G A
Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow.
Zh Vyssh Nerv Deiat Im I P Pavlova. 2003 Nov-Dec;53(6):722-9.
Dynamics of tuning to orientation of flashing light bar and to orientation of cross-like figure was studied by a temporal slices method in 87 neurons of the cat primary visual cortex. Tuning was plotted by spikes number in the entire response and in its successive fragments with a step of 20 ms. It was found that successive dynamic shift of preferred orientation of a bar was typical for 87% units, white such shift of preferred orientation of a cross was met in 75% of cases. Comparison of tuning dynamics for bar and cross allowed to separate units into three groups: the first one (58.6% of cases) with larger dynamic shift of a bar preferred orientation then of a cross (74.9 +/- 5.8 degrees [symbol: see text] 29.8 +/- 4.1 degrees, correspondingly, p < 0.00001), the second group (21.5%) with opposite effect (24.2 +/- 5.2 degrees and 69.2 +/- 10.0 degrees, p < 0.0002) and the third group (19.8%) without significant shift of preferred orientation of bar and cross and without difference in their dynamics. Possible mechanisms of the preferred orientation dynamics and its difference for bar and cross are discussed.
采用时间切片法，在猫初级视觉皮层的87个神经元中研究了对闪烁光条方向和十字形图形方向的调谐动力学。通过整个反应及其以20毫秒为步长的连续片段中的尖峰数量绘制调谐曲线。结果发现，87%的神经元单位表现出光条优先方向的连续动态偏移，而75%的情况中出现十字优先方向的这种偏移。比较光条和十字的调谐动力学，可将神经元单位分为三组：第一组（58.6%的情况），光条优先方向的动态偏移大于十字（分别为74.9±5.8度和29.8±4.1度，p<0.00001）；第二组（21.5%）有相反的效应（24.2±5.2度和69.2±10.0度，p<0.0002）；第三组（19.8%），光条和十字的优先方向没有明显偏移，且它们的动力学没有差异。文中讨论了优先方向动力学及其光条和十字差异的可能机制。
