Pasternak T
Vision Res. 1986;26(8):1187-94. doi: 10.1016/0042-6989(86)90100-8.
Contrast sensitivity for moving and counterphase gratings was measured over a range of temporal and spatial frequencies in normal cats and in cats with selective loss of cortical directional selectivity (strobe-reared cats). Sensitivity ratios (moving/counterphase) in normal cats were largest (mean ratio: 1.9) at lower spatial and at higher temporal frequencies. The sensitivity of strobe-reared cats was more similar for moving and counterphase gratings than was that of normal cats. Sensitivity ratios were lower in strobe-reared cats (mean ratios: 1.2-1.5) than in normal cats and were largely independent of spatial and temporal frequencies. Reduced sensitivity ratios in strobe-reared cats were not the result of greater sensitivity to counterphase gratings, as would be expected if counterphase gratings were detected by independent directionally selective mechanisms. Rather, the low ratios appear to be due largely to reduced sensitivity to moving gratings. These results suggest that the superior sensitivity of normal cats for moving gratings is due to the activity of cortical directionally selective neurons. Moreover, it appears unlikely that the detection of counterphase gratings is mediated by directionally selective mechanisms.
在正常猫以及选择性丧失皮质方向选择性的猫（频闪饲养的猫）中，测量了在一系列时间和空间频率下对移动光栅和反相光栅的对比敏感度。正常猫的敏感度比率（移动/反相）在较低空间频率和较高时间频率时最大（平均比率：1.9）。与正常猫相比，频闪饲养的猫对移动光栅和反相光栅的敏感度更为相似。频闪饲养的猫的敏感度比率（平均比率：1.2 - 1.5）低于正常猫，并且在很大程度上与空间和时间频率无关。频闪饲养的猫的敏感度比率降低并非对反相光栅敏感度更高的结果，而如果反相光栅是由独立的方向选择性机制检测到的话，情况就会是这样。相反，低比率似乎主要是由于对移动光栅的敏感度降低。这些结果表明，正常猫对移动光栅的卓越敏感度归因于皮质方向选择性神经元的活动。此外，反相光栅的检测似乎不太可能由方向选择性机制介导。
