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

Abstract:

:In tasks requiring judgments about visual stimuli, humans exhibit repetition priming, responding with increased speed when a stimulus is repeated. Repetition priming might depend on repetition suppression, a phenomenon first observed in monkey inferotemporal cortex (IT) whereby, when a stimulus is repeated, the strength of the neuronal visual response is reduced. If the reduction resulted in sharpening of the cortical representation of the stimulus, and did not just scale it down, then speeded processing might result. To explore the relation between repetition priming and repetition suppression, we monitored neuronal activity in IT while monkeys performed a symmetry decision task. We found 1) that monkeys exhibit repetition priming, 2) that IT neurons simultaneously exhibit repetition suppression, 3) that repetition priming and repetition suppression do not vary in a significantly correlated fashion across trials, and 4) that repetition suppression scales down the representation of the stimulus without sharpening it. We conclude that repetition suppression accompanies repetition priming but is unlikely to be its cause.

journal_name

J Neurophysiol

authors

McMahon DB,Olson CR

doi

10.1152/jn.01042.2006

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

3532-43

issue

5

eissn

0022-3077

issn

1522-1598

pii

01042.2006

journal_volume

97

pub_type

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