Guo K, Benson P J, Blakemore C
University Laboratory of Physiology, Oxford, UK.
Neuroreport. 1998 Jun 22;9(9):2103-7. doi: 10.1097/00001756-199806220-00036.
Previous studies have reported that some patients with damage to striate cortex retain the ability to detect monochromatic light and discriminate direction of achromatic movement in their blind visual fields. We investigated the residual chromatic visual capacity of a well-studied patient (GY) who has a unilateral lesion to striate cortex (V1). The data demonstrated that GY was able to detect and discriminate isoluminant colour targets presented in his blind hemifield. The velocity and contrast of chromatic moving stimuli affected GY's levels of conscious experience of movements he was able to discriminate. As the velocity or contrast was increased, his discrimination performance improved in line with rising visual awareness and judgement confidence. At isoluminance, GY continued to discriminate motion direction with above chance accuracy. These results indicate chromatic signals can also be used to process motion information in the absence of primary visual cortex.
以往的研究报告称，一些纹状皮质受损的患者在其盲视野中仍保留检测单色光和辨别消色差运动方向的能力。我们研究了一位经过充分研究的患者（GY）的残余色觉能力，该患者有单侧纹状皮质（V1）损伤。数据表明，GY能够检测并辨别呈现于其盲半视野中的等亮度颜色目标。彩色移动刺激的速度和对比度影响了GY对他能够辨别的运动的意识体验水平。随着速度或对比度的增加，他的辨别表现随着视觉意识和判断信心的提高而改善。在等亮度条件下，GY继续以高于随机概率的准确率辨别运动方向。这些结果表明，在没有初级视觉皮质的情况下，颜色信号也可用于处理运动信息。
