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Memory-driven processing in human medial occipital cortex: An event-related optical signal (EROS) study

Published online by Cambridge University Press:  01 May 1998

GABRIELE GRATTON ,
MONICA FABIANI ,
MARSHA R. GOODMAN-WOOD  and
M. CATHERINE DESOTO
GABRIELE GRATTON
Affiliation:
Department of Psychology, University of Missouri, Columbia, USA
MONICA FABIANI
Affiliation:
Department of Psychology, University of Missouri, Columbia, USA
MARSHA R. GOODMAN-WOOD
Affiliation:
Department of Psychology, University of Missouri, Columbia, USA
M. CATHERINE DESOTO
Affiliation:
Department of Psychology, University of Missouri, Columbia, USA
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Abstract

Memory-driven processing in medial occipital areas (Area V1 and immediately adjacent structures) was investigated noninvasively using the event-related optical signal (EROS). Subjects viewed two letter stimuli presented in the left and right hemifields, respectively. They then viewed a centrally presented test letter and had to indicate whether this letter was the same as either of the letters presented earlier. The initial EROS response to the test stimulus in medial occipital areas (latency: 50–150 ms) was unilaterally suppressed in the hemisphere previously exposed to the same stimulus. This finding suggests that medial occipital cortex activity is modulated by a rapidly adapting hemispheric-specific pattern recognition mechanism.

Keywords

Medial occipital cortexArea V1Event-related optical signal (EROS)Memory-driven processingPattern recognitionHemispheric organization
Type
SPECIAL REPORT
Information
Psychophysiology , Volume 35 , Issue 3 , May 1998 , pp. 348 - 351
Copyright
© 1998 Society for Psychophysiological Research

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