University of Oxford, Department of Experimental Psychology, South Parks Road, Oxford OX13UD, UK.
Conscious Cogn. 2010 Jun;19(2):520-33. doi: 10.1016/j.concog.2010.01.008. Epub 2010 Feb 18.
It remains unclear what is being processed in blindsight in response to faces, colours, shapes, and patterns. This was investigated in two hemianopes with chromatic and achromatic stimuli with sharp or shallow luminance or chromatic contrast boundaries or temporal onsets. Performance was excellent only when stimuli had sharp spatial boundaries. When discrimination between isoluminant coloured Gaussians was good it declined to chance levels if stimulus onset was slow. The ability to discriminate between instantaneously presented colours in the hemianopic field depended on their luminance, indicating that wavelength discrimination totally independent of other stimulus qualities is absent. When presented with narrow-band colours the hemianopes detected a stimulus maximally effective for S-cones but invisible to M- and L-cones, indicating that blindsight is mediated not just by the mid-brain, which receives no S-cone input, or that the rods contribute to blindsight. The results show that only simple stimulus features are processed in blindsight.
尚不清楚在盲视中，针对面孔、颜色、形状和图案，大脑在处理什么。对此，我们用具有鲜明或浅淡亮度或颜色对比边界或时间起始的有色和无色刺激，对两位半侧偏盲者进行了研究。只有当刺激具有鲜明的空间边界时，他们的表现才非常出色。如果刺激起始缓慢，那么在等亮度彩色高斯之间进行区分的能力就会下降到随机水平。在半盲视野中即时呈现颜色的区分能力取决于它们的亮度，这表明与其他刺激特性完全无关的波长辨别能力是不存在的。当呈现窄带颜色时，半侧偏盲者可以检测到对 S 锥细胞最有效的刺激，但对 M 和 L 锥细胞不可见，这表明盲视不仅仅是由中脑介导的，中脑接收不到 S 锥细胞的输入，或者是棒体对盲视有贡献。研究结果表明，只有简单的刺激特征在盲视中被处理。
