视觉运动的时间总和

Temporal summation of visual motion.

作者信息

Simpson W A

机构信息

Department of Psychology, University of Winnipeg, Manitoba, Canada.

出版信息

Vision Res. 1994 Oct;34(19):2547-59. doi: 10.1016/0042-6989(94)90241-0.

DOI:10.1016/0042-6989(94)90241-0

PMID:7975294

Abstract

The sensitivity of the visual system to changes in velocity over time was investigated using the approach that Rashbass [(1970) Journal of Physiology, 210, 165-186] applied to luminance. Pairs of motion impulses (jumps) were presented, and thresholds for discriminating these pairs of impulses from a stationary display were determined. The results were consistent with a model that posits linear filtering of the input velocity, squaring, and integration over some duration. According to the model, the degree of interaction between the impulses reveals the autocorrelation of the impulse response of the motion system. The data were well fit by a three-element cascade of leaky integrators. In the temporal frequency domain, the visual motion system is a lowpass filter. This means that the visual system is quite insensitive to acceleration.

摘要

采用拉什巴斯[（1970年）《生理学杂志》，210卷，165 - 186页]应用于亮度的方法，研究了视觉系统对速度随时间变化的敏感性。呈现了成对的运动脉冲（跳跃），并确定了从静止显示中区分这些成对脉冲的阈值。结果与一个模型一致，该模型假定对输入速度进行线性滤波、平方以及在一定持续时间内进行积分。根据该模型，脉冲之间的相互作用程度揭示了运动系统脉冲响应的自相关。数据通过一个由泄漏积分器组成的三元件级联很好地拟合。在时间频率域中，视觉运动系统是一个低通滤波器。这意味着视觉系统对加速度相当不敏感。