EFFECTS OF ADAPTING LUMINANCE AND STIMULUS CONTRAST ON THE TEMPORAL AND SPATIAL LIMITS OF SHORT-RANGE MOTION
EFFECTS OF ADAPTING LUMINANCE AND STIMULUS CONTRAST ON THE TEMPORAL AND SPATIAL LIMITS OF SHORT-RANGE MOTION
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DOI：
10.1016/0042-6989(90)90083-w
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发表时间：
1990-01-01
期刊：
影响因子：
1.8
通讯作者：
DILOLLO, V
中科院分区：
文献类型：
--
作者：
DAWSON, M;DILOLLO, V
在计算机模拟和心理物理实验中，研究了短距离运动的感知作为适应亮度和刺激对比度的函数。刺激是在示波器上以两个连续帧绘制的随机点，由刺激间间隔（ISI）分隔。在模拟和实证研究中，我们估计了连续帧中相应点之间的最大空间位移（dmax），以及在80%的时间内感知到相干运动的最大ISI（tmax）。从概念上讲，这项研究是基于一个整流精心制作的Reichardt检测器与空间和时间的过滤器在其输入。现有的心理物理学和神经生理学的数据被用来提供亮度和对比度对输入滤波器的空间和时间特性的影响的估计。结果表明，适应亮度对运动感知的空间和时间限制有很强的影响：亮度的降低会使dmax和tmax显著增加。然而，dmax和tmax均不受刺激对比度变化的影响。这些结果完全符合基于修正的Reichardt检测器的预期。心理物理学的结果的替代解释进行了讨论。
Perception of short-range motion was studied as a function of adapting luminance and of stimulus contrast in computer simulations and in psychophysical experiments. The stimuli were random dots plotted on an oscilloscope in two sequential frames, separated by an inter-stimulus interval (ISI). Both in the simulations and in the empirical studies, we estimated the maximum spatial displacement (dmax) between corresponding dots in the successive frames, and the maximum ISI (tmax) at which coherent motion was perceived 80% of the time. Conceptually, the research was based on a rectified elaborated Reichardt detector with spatial and temporal filters at its inputs. Extant psychophysical and neurophysiological data were employed to provide estimates of the effects of luminance and contrast on the spatial and temporal characeristics of the input filters. Results showed a strong effect of adapting luminance on both the spatial and temporal limits of motion perception: decrements in luminance produced marked increments in both dmax and tmax. However, neither dmax nor tmax was affected by changes in stimulus contrast. These outcomes are entirely consonant with expectations based on the rectified elaborated Reichardt detector. Alternative explantations of the psychophysical results are discussed.