HIGH FUNDAMENTAL SPATIAL-FREQUENCIES AND EDGES HAVE DIFFERENT PERCEPTUAL CONSEQUENCES IN THE GROUP END-TO-END MOVEMENT PHENOMENON
HIGH FUNDAMENTAL SPATIAL-FREQUENCIES AND EDGES HAVE DIFFERENT PERCEPTUAL CONSEQUENCES IN THE GROUP END-TO-END MOVEMENT PHENOMENON
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DOI：
10.1068/p100375
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发表时间：
1981-01-01
期刊：
影响因子：
1.7
通讯作者：
GRASSMUCK, J
中科院分区：
文献类型：
--
作者：
PETERSIK, JT;GRASSMUCK, J
观看两个交替的帧的受试者感知到三个条纹从显示器的一端移动到另一端而两个条纹从显示器的一端移动到另一端，并且两个重叠的条纹静止(端到端移动)，其中每一框都包含水平行中的三个垂直条纹，并且在一个帧中相对于另一帧横向移动了一个周期。在适当的呈现时间参数(帧持续时间、刺激间间隔)下，显示器的感知是双稳的。实验表明，这些不同运动感觉的相对强度取决于显示器的基本空间频率和刺激波形。方波刺激在高空间频率下具有能量，其效果与增加基本空间频率所产生的效果相反。弱视眼与普通观众的不同之处只在于对方波刺激的感知。
A subject viewing two alternating frames, each containing, say, three vertical stripes in a horizontal row, displaced laterally by one cycle in one frame with respect to the other, perceives either the three stripes moving left-right-left in unison (group movement) or one stripe moving from one end of the display to the other and the two overlapping stripes stationary (end-to-end movement). At suitable temporal parameters of presentation (frame duration, interstimulus interval) the perception of the display is bistable. Experiments have shown that the relative strengths of these alternative movement sensations depend upon the fundamental spatial frequency of the display and upon stimulus waveform. Square-wave stimuli, which have energy at high spatial frequencies, had effects opposite to those produced by increases in fundamental spatial frequency. Amblyopes differed from normal viewers only in the perception of the square-wave stimuli.