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Repetition suppression in monkey inferotemporal cortex: relation to behavioral priming.

David B T McMahon¹, Carl R Olson

¹Department of Neuroscience, University of Pittsburgh, Pennsylvania, USA. dbtm@mit.edu

Journal of Neurophysiology

|March 9, 2007

Summary

Repetition priming speeds up visual processing. However, repetition suppression in the inferotemporal cortex (IT) scales down neural responses without sharpening them, suggesting it does not cause priming.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Humans show faster responses to repeated visual stimuli (repetition priming).
Repetition suppression, a reduced neural response to repeated stimuli, is observed in the inferotemporal cortex (IT).
It was hypothesized that repetition suppression might cause repetition priming by sharpening neural representations.

Purpose of the Study:

To investigate the relationship between repetition priming in behavior and repetition suppression in neural activity.
To determine if repetition suppression underlies repetition priming.

Main Methods:

Monitored neuronal activity in the IT cortex of monkeys.
Monkeys performed a symmetry decision task involving visual stimuli.
Analyzed the correlation between behavioral repetition priming and neural repetition suppression across trials.

Main Results:

Monkeys demonstrated repetition priming.
IT neurons exhibited repetition suppression.
Repetition priming and suppression showed no significant correlation across trials.
Repetition suppression scaled down neural responses but did not sharpen them.

Conclusions:

Repetition suppression occurs alongside repetition priming.
Repetition suppression is unlikely to be the causal mechanism for repetition priming.
The findings suggest distinct neural processes underlie priming and suppression.