Effects
of Intercentral and Intercontour Distances on Visual Stream Segregation
I. Watanabe |
Two
experiments were performed to examine which is important, intercentral
or intercontour distance between the stimuli, to affect visual stream
segregation (VISS). VISS is a phenomenon of two sets of apparent
motion, which is seen among four lights, A, B, C, D on a vertical
row presented at a fast rate alternately in the order of A, C, B,
and D. Eight undergraduates were required to find the upper limits
of the interstimulus interval (ISI) for producing VISS under each
condition of intercentral and intercontour distances. The ISI increased
with intercentral distance, but was constant irrespective of the
intercontour distance. The results show that it is not intercontour
but intercentral distance between the stimuli that is important to
decide VISS and apparent motion between two stimuli.
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