APPARENT SPEED OF SAMPLED MOTION

被引:15
作者
CASTET, E
机构
[1] Laboratoire de Psychophysique Sensorielle, UniversitéLouis Pasteur, 12 rue Goethe
关键词
APPARENT SPEED; TEMPORAL FREQUENCY; APPARENT MOTION; MOTION SAMPLING;
D O I
10.1016/0042-6989(95)98717-N
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Perceived speed was measured for stimuli moving unidirectionally in apparent motion with different sampling steps. The stimuli were displayed at successive locations for very brief durations (ontime = 1 msec). The basic result is an elevation of apparent speed produced by increasing the sampling step. This speed-up effect is maximal at low speeds (2 deg/sec), then progressively decreases with higher speeds until it disappears at medium velocities (8 deg/sec). In addition, the speed-up observed at low speeds declines when the ontime is gradually increased from 1 msec to larger values, the largest one corresponding to ''staircase motion''. These results are consistent with models assuming that speed-encoding is based on an antagonistic comparison of the activity in two broadly tuned temporal filters (low-pass and band-pass). The high temporal frequencies introduced by motion-sampling would activate the band-pass filter relatively more and would thus produce an overestimation of apparent speed.
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页码:1375 / 1384
页数:10
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