ECCENTRICITY-DEPENDENT SCALING OF THE LIMITS FOR SHORT-RANGE APPARENT MOTION PERCEPTION
ECCENTRICITY-DEPENDENT SCALING OF THE LIMITS FOR SHORT-RANGE APPARENT MOTION PERCEPTION
复制标题
DOI：
10.1016/0042-6989(85)90188-9
复制
发表时间：
1985-01-01
期刊：
影响因子：
1.8
通讯作者：
BRADDICK, OJ
中科院分区：
文献类型：
--
作者：
BAKER, CL;BRADDICK, OJ
当一组随机点被移位时，当位移超过一个极限值（dmax）时，[人类]报告明显运动方向的能力就会失效。显然，dmax随着视网膜偏心率以不同于空间测量的方式快速增加，空间测量例如被认为取决于到区域17的投影的放大因子的敏锐度。给出可检测运动的最小位移（dmax）显示出随着偏心率的增加而增加较浅，这与皮质放大率的变化更相容。表观运动对时间变量（曝光持续时间，刺激间隔）的依赖性随偏心率的变化可以忽略不计。因此，动态范围和上限的检测速度大大增加偏心。dmax随偏心率的增加意味着视运动的感知将显示与显示尺度的近似不变性，即使dmax具有取决于感受野结构的局部固定值。
The ability [in humans] to report the direction of apparent motion when an array of random dots is displaced fails when the displacement exceeds a limiting value (dmax). Evidently, dmax increases rapidly with retinal eccentricity in a manner different from spatial measures such as acuity which are believed to depend on the magnification factor of projection to area 17. The minimum displacement giving detectable motion (dmax) shows a shallower increase with eccentricity which is more compatible with the variation of cortical magnification. The dependence of apparent motion on the timing variables (exposure duration, inter-stimulus interval) changes negligibly with eccentricity. Consequently the dynamic range and the upper limit of detectable velocities increases greatly with eccentricity. The increase of dmax with eccentricity means that the perception of apparent motion will show an approximate invariance with display scale, even though dmax has a locally fixed value depending on receptive field structure.