Orientation discrimination in the cat: a distributed function.
Orientation discrimination in the cat: a distributed function.
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DOI：
10.1073/pnas.87.3.1134
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发表时间：
1990-02
影响因子：
11.1
通讯作者：
G. Orban;E. Vandenbussche;J. Sprague;P. De Weerd
中科院分区：
文献类型：
--
作者：
G. Orban;E. Vandenbussche;J. Sprague;P. De Weerd
在17和18区病变的各种组合之前和之后，猫接受了训练，用类似于生理实验中使用的刺激（12度长的窄光条）进行精细的方向辨别。在不同的对比度水平和不同的条形宽度下，术前和术后测量辨别阈值，病变后长达1.5年。对于高对比度刺激，病变局限于区域17或区域18几乎没有影响，但那些病变涉及区域17和区域18的相当大的一部分提高阈值。在后一种情况下，在区域18的剩余量和辨别力受损的条宽度之间存在关系。在低对比度赤字，看到只有狭窄的宽度。这些结果导致以下结论。(i)方向辨别是分布在区域17和18内和区域17和18之间的功能。(ii)这种功能在皮层中的分布取决于刺激宽度。(iii)X系统不携带识别方位所需的信号。(iv)位于区域17的服从中央视觉的部分中的对于取向最窄调谐的细胞不确定取向辨别阈值。
Cats were trained to make fine orientation discriminations with stimuli similar to those used in physiological experiments--narrow, light bars 12 degrees long--before and after various combinations of lesions of areas 17 and 18. Discrimination thresholds were measured at different contrast levels and different bar widths, both pre- and postoperatively, for up to 1.5 years after the lesion. For high contrast stimuli, lesions restricted to area 17 or area 18 had little effect, but those lesions involving area 17 and a substantial part of area 18 raised thresholds. In the latter case there was a relationship between the amount of area 18 spared and the bar width at which discrimination was impaired. At low contrast deficits were seen only for narrow widths. These results lead to the following conclusions. (i) Orientation discrimination is a function distributed within and across areas 17 and 18. (ii) How this function is distributed in this cortex depends on stimulus width. (iii) The X system does not carry the signal necessary for orientation discrimination. (iv) Cells most narrowly tuned for orientation, which reside in the part of area 17 subserving central vision, do not determine the orientation discrimination threshold.