Tyrrell R A, Rudolph K K, Eggers B G, Leibowitz H W
Pennsylvania State University, University Park 16802-3106.
Percept Psychophys. 1993 Oct;54(4):431-8. doi: 10.3758/bf03211765.
An earlier study from our laboratory provided initial support for the hypothesis that information facilitating visual guidance persists in the absence of retinal stimulation. The present study supports and extends this hypothesis with three experiments in which visually occluded subjects positioned a point of light at the location of a previously viewed target and also walked in the direction of a previously viewed path. In both tasks, performance was possible following occlusion, and in all cases, performance slowly and significantly decreased with longer durations of occlusion. This decay in performance was gradual and had a "half-life" of greater than 15 sec. Absolute performance was correlated across tasks. The effect of occlusion on absolute error in the localization performance was relatively stable within individuals over a 3-week period. The biological utility of guidance information persistence is discussed along with implications for space constancy, illusions of motion, and problems of disorientation.
即便是在没有视网膜刺激的情况下，有助于视觉引导的信息仍会持续存在。本研究通过三个实验支持并扩展了这一假设。在实验中，视觉被遮挡的受试者将一个光点定位在先前看到的目标位置，并朝着先前看到的路径方向行走。在这两项任务中，遮挡后仍有可能完成任务，并且在所有情况下，随着遮挡时间的延长，表现会缓慢且显著下降。这种表现的衰退是渐进的，“半衰期”大于15秒。两项任务的绝对表现具有相关性。在3周的时间内，遮挡对定位表现中绝对误差的影响在个体内部相对稳定。我们还讨论了引导信息持续存在的生物学效用以及对空间恒常性、运动错觉和定向障碍问题的影响。
