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Matthias Niemeier

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PSYB51- Chapter 7 Perception
and Cognition
Motion Perception
Robert Addams has described motion aftereffect (MAE) the illusion of
motion of a stationary object that occurs after prolonged exposure to a moving
After viewing motion in a constant direction for a sustained period of
time , we see stationary objects that we view subsequently as moving
in the opposite direction
MAE is caused by opponent processes for color vision
Apparent Motion
Apparent Motion The illusory impression of smooth motion resulting from
the rapid alteration of objects that appear in different locations in rapid
The illusion was first demonstrated by Sigmund Exner in 1875
He set up a contraption that would generate electrical sparks
separated from each other by a very short distance in space and a very
short period of time.
Even through there were two different sparks- two different perceptual
objects- observers swore that they saw a single spark moving from one
position to the other
21st century, televisin, using computers are all examples of apparent
The Correspondence and Aperture Problems
Aperture: An opening that allows only a partial view of the object
Correspondence Problem: The problem faced by the motion detection
system of knowing which feature in frame 2 corresponds to a particular
feature in frame 1
Aperture Problem: The fact that when a moving object is viewed through
an aperture , the direction of motion of a local feature or part of the object
may be ambiguous
Detection of Global Motion in Area MT
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