University of California, San Diego.
J Cogn Neurosci. 1993 Fall;5(4):453-66. doi: 10.1162/jocn.1993.5.4.453.
Abstract Five patients with visual extinction following unilateral brain injury were briefly presented with colored letters in either or both visual fields, and required to report and locate the colors or the shapes. On double simultaneous stimulation, they tended to miss the event contralateral to their lesion. This extinction was increased when the two stimuli were the same on the reported dimension, Similarity on the irrelevant dimension had no effect. These data suggest that extinguished colors and shapes may be correctly extracted by the visual system (when task-relaant) even though they are unavailable for verbal report. An analogy is made with the phenomena of "repetition blindness" in normal observers, and it is proposed that extinction may reflect failure in a token-individuation process for correctly extracted visual types.
摘要 本文简要介绍了 5 例单侧脑损伤后出现视觉消失的患者，他们在左右视野中分别或同时呈现彩色字母，需要报告并定位颜色或形状。在双重同时刺激下，他们往往会错过病变对侧的事件。当报告维度上的两个刺激相同时，这种消失会增加；而在不相关维度上的相似性则没有影响。这些数据表明，即使无法进行口头报告，视觉系统（在与任务相关时）也可能正确提取消失的颜色和形状。这与正常观察者中的“重复盲”现象类似，并且提出消失可能反映了正确提取的视觉类型的标记个体化过程中的失败。
