Marzi C A, Girelli M, Miniussi C, Smania N, Maravita A
University of Verona, Italy.
J Cogn Neurosci. 2000 Sep;12(5):869-77. doi: 10.1162/089892900562471.
To study the electrophysiological correlates of conscious vision, we recorded event-related potentials (ERPs) in a patient with partial unilateral visual extinction as a result of right-hemisphere damage. When, following bilateral presentations, contralesional stimuli were not perceived, there was an absence of the early attention-sensitive P1 (80-120 msec) and N1 (140-180 msec) components of the ERP response. In contrast, following unilateral presentations, or in those bilateral presentations in which contralesional stimuli were perceived (about 60%), these ERP components were present. These results provide novel evidence that extinction involves the stage of early focusing of attention and that the P1 and N1 components of visual ERPs are reliable physiological correlates of conscious vision.
为了研究有意识视觉的电生理关联，我们记录了一名因右侧半球损伤导致部分单侧视觉消退患者的事件相关电位（ERP）。在双侧呈现刺激后，如果对侧刺激未被感知，ERP反应中早期对注意力敏感的P1（80 - 120毫秒）和N1（140 - 180毫秒）成分缺失。相比之下，在单侧呈现刺激后，或者在那些对侧刺激被感知的双侧呈现刺激中（约60%），这些ERP成分存在。这些结果提供了新的证据，表明消退涉及早期注意力聚焦阶段，并且视觉ERP的P1和N1成分是有意识视觉可靠的生理关联指标。
