随机点运动中向上位移极限的时空特性

Temporal and spatial characteristics of the upper displacement limit for motion in random dots.

作者信息

Nakayama K, Silverman G H

出版信息

Vision Res. 1984;24(4):293-9. doi: 10.1016/0042-6989(84)90054-3.

Abstract

The upper displacement limit (Dmax) or Braddick limit was measured in random dots. We then interposed a variable duration pause at half the distance jumped. Of interest was to see the shortest time (delta t) which would yield a value of two times Dmax, thus indicating the time required to process one additional Braddick limit. A surprisingly short interval (as short as 10 msec under some conditions) was required. Furthermore for intermediate durations (20 to over 100 msec), the total limit was often more than doubled, indicating a nonlinear potentiation or sequential recruitment between successive displacements. Increasing field size had the following effects: (1) it increased Dmax, (2) it decreased delta t (the processing time), (3) it increased Vmax (the maximum velocity), (4) it increased the amount of sequential recruitment.

摘要

上位移极限（Dmax）或布拉迪克极限是在随机点中测量的。然后，我们在跳跃距离的一半处插入一个可变持续时间的暂停。我们感兴趣的是找出能产生两倍Dmax值的最短时间（δt），这表明处理一个额外的布拉迪克极限所需的时间。结果发现所需的时间间隔出奇地短（在某些条件下短至10毫秒）。此外，对于中间持续时间（20至100毫秒以上），总极限常常会增加一倍以上，这表明连续位移之间存在非线性增强或顺序性募集。增加视野大小有以下影响：（1）增加Dmax，（2）减少δt（处理时间），（3）增加Vmax（最大速度），（4）增加顺序性募集的量。