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Summary: 1
Moving in a Fog: Stimulus contrast affects the perceived speed and direction of
motion
Stuart Anstis
Dept of Psychology
UCSD
9500 Gilman Drive
La Jolla CA 92093-0109
sanstis@ucsd.edu
Abstract - Moving cars give the illusion of slowing down
in foggy conditions, because low contrast reduces
perceived speed.. A grey square that drifts horizontally
across a surround of black and white vertical stripes
appears to stop and start as it crosses each stripe,
because its contrast keeps changing. A moving square
whose vertical and horizontal edges have different
contrasts will show illusory distortions in perceived
direction. Contrast also affects the apparent amplitude
and salience of back-and-forth apparent motion. Also,
a line of black and white dots on a gray surround
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