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J Neurophysiol (December 1, 2002). 10.1152/jn.00276.2002
Submitted on 2 April 2002
Accepted on 13 August 2002
University of California, Davis Center for Neuroscience and Section of Neurobiology, Physiology, and Behavior, Davis, California 95616
Van Wezel, Richard J. A. and
Kenneth
H. Britten.
Motion Adaptation in Area MT. J. Neurophysiol. 88: 3469-3476, 2002. In many sensory systems, exposure
to a prolonged stimulus causes adaptation, which tends to reduce neural
responses to subsequent stimuli. Such effects are usually
stimulus-specific, making adaptation a powerful probe into information
processing. We used dynamic random dot kinematograms to test the
magnitude and selectivity of adaptation effects in the middle temporal
area (MT) and to compare them to effects on human motion
discrimination. After 3 s of adaptation to a random dot pattern
moving in the preferred direction, MT neuronal responses to subsequent
test patterns were reduced by 26% on average compared with adaptation
to a static pattern. This reduction in response magnitude was largely
independent of what test stimulus was presented. However, adaptation in
the opposite direction changed responses less often and very
inconsistently. Therefore motion adaptation systematically and
profoundly affects the neurons in MT representing the adapted
direction, but much less those representing the opposite direction. In
human psychophysical experiments, such adapting stimuli affected
direction discrimination, biasing choices away from the adaptation
direction. The magnitude of this perceptual shift was consistent with
the magnitude of the changes seen in area MT, if one assumes that a
motion comparison step occurs after MT.
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