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Perception. 2001;30(7):785-94. Footsteps and inchworms: Illusions show that contrast modulates motion
 

Summary: 1
Perception. 2001;30(7):785-94.
Footsteps and inchworms: Illusions show that contrast modulates motion
salience
by
Stuart Anstis
Dept of Psychology
UCSD
9500 Gilman Drive
La Jolla CA 92093-0109
(858)-534-5456
sanstis@ucsd.edu
Abstract
A horizontal grey bar that drifts horizontally across a surround of black and white vertical stripes
appears to stop and start as it crosses each stripe. A dark bar appears to slow down on a black stripe,
where its edges have low contrast, and to accelerate on a white stripe, where its edges have high
contrast. A light grey bar appears to slow down on a white stripe and to accelerate on a black stripe. If
the background luminances at the leading and trailing edges of the moving bar are the same, the bar
appears to change speed, and if they are different the bar appears to change in length. A plaid surround
can induce 2-D illusions that modulate the apparent direction, not just the speed, of moving squares.

  

Source: Anstis, Stuart - Department of Psychology, University of California at San Diego

 

Collections: Biology and Medicine