Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.
J Neurol Sci. 2012 May 15;316(1-2):184-8. doi: 10.1016/j.jns.2012.01.006. Epub 2012 Jan 27.
Palinopsia is an abnormal perseverative visual phenomenon, whose relation to normal afterimages is unknown. We measured palinoptic positive visual afterimages in a patient with a cerebral lesion. Positive afterimages were confined to the left inferior quadrant, which allowed a comparison between afterimages in the intact and the affected part of his visual field. Results showed that negative afterimages in the affected quadrant were no different from those in the unaffected quadrant. The positive afterimage in his affected field, however, differed both qualitatively and quantitatively from normal afterimages, being weaker but much more persistent, and displaced from the location of the inducing stimulus. These findings reveal distinctions between pathological afterimages of cerebral origin and physiological afterimages of retinal origin.
视后像残留是一种异常的视觉残留现象，目前尚不清楚其与正常后像的关系。我们对一名脑损伤患者的视后像残留阳性进行了测量。阳性后像局限于左下方视野，这使得我们可以比较其完整视野和受损视野的后像。结果表明，受损象限的负性后像与未受损象限无差异。然而，其受损视野中的阳性后像在质量和数量上均与正常后像不同，其强度较弱但持续时间更长，并且与诱导刺激的位置存在偏差。这些发现揭示了大脑来源的病理性后像与视网膜来源的生理性后像之间的区别。
