动态随机点刺激中的时空整合

Temporal and spatial integration in dynamic random-dot stimuli.

作者信息

Watamaniuk S N, Sekuler R

机构信息

Department of Psychology, Northwestern University, Evanston, IL 60208.

出版信息

Vision Res. 1992 Dec;32(12):2341-7. doi: 10.1016/0042-6989(92)90097-3.

DOI:10.1016/0042-6989(92)90097-3

PMID:1288010

Abstract

Random-dot cinematograms comprising many different, spatially intermingled local motion vectors can produce a percept of global coherent motion in a single direction. Thresholds for discriminating the direction of global motion were measured under various conditions. Discrimination thresholds increased with the width of the distribution of directions in the cinematogram. Thresholds decreased as the duration of area of the cinematogram increased. Temporal integration for global direction discrimination extends over about 465 msec (9.3 frames) while the spatial integration limit is at least as large as 63 deg2 (circular aperture diameter = 9 deg). The large spatial integration area is consistent with the physiology of higher visual areas such as MT and MST.

摘要

包含许多不同的、空间上相互交织的局部运动矢量的随机点电影图，可以产生单个方向上的全局连贯运动感知。在各种条件下测量了辨别全局运动方向的阈值。辨别阈值随着电影图中方向分布的宽度增加而增加。阈值随着电影图的面积持续时间增加而降低。用于全局方向辨别的时间整合延伸约465毫秒（9.3帧），而空间整合极限至少为63平方度（圆形孔径直径 = 9度）。大的空间整合区域与诸如MT和MST等高级视觉区域的生理学一致。