Casco C, Morgan M J, Ward R M
Department of General Psychology, University of Padua, Italy.
Perception. 1989;18(3):285-91. doi: 10.1068/p180285.
The maximum displacement threshold for direction discrimination (dmax) was determined for single or paired dot targets moving discretely against a background of dynamic visual noise. dmax rose as the spatial density of noise was reduced, or when the interframe interval was decreased. dmax was greater for dot pairs than for single dots, and rose progressively as the distance between the dots was reduced. dmax was also greater if the orientation of the target dot pairs differed from the orientation of paired dots in the background noise. Dichoptic presentation of the target and background noise allowed the target to be detected with an accuracy that did not depend on displacement.
针对在动态视觉噪声背景下离散移动的单个或成对点状目标，确定了方向辨别（dmax）的最大位移阈值。随着噪声的空间密度降低或帧间间隔减小，dmax升高。成对点状目标的dmax大于单个点状目标，并且随着点状目标之间距离的减小而逐渐升高。如果目标点状目标对的方向与背景噪声中配对点状目标的方向不同，dmax也会更大。目标和背景噪声的双眼分视呈现使目标能够以不依赖于位移的精度被检测到。
