Visual novel stimuli in an ERP novelty oddball paradigm: Effects of familiarity on repetition and recognition memory

Authors


  • The authors thank Mr. Charles L. Brown III for computer programming, Mr. Martin Duff for assistance in data collection, and Mr. Michael Bersick for his help with statistical analyses. We are grateful to all volunteers who generously gave their time to participate in the study. This research was supported in part by grants #HD37193 (Y.C.) and #HD14959 (D.F.) and by the New York State Department of Mental Hygiene.

Address reprint requests to: Dr. Yael M. Cycowicz, Cognitive Electrophysiology Laboratory, New York State Psychiatric Institute, 1051 Riverside Drive, Unit 21, New York, NY 10032, USA. E-mail: yc60@columbia.edu.

Abstract

The orienting response, the brain's reaction to novel and/or out of context familiar events, is reflected by the novelty P3 of the ERP. Contextually novel events also engender high rates of recognition memory. We examined, under incidental and intentional conditions, the effects of visual symbol familiarity on the novelty P3 recorded during an oddball task and on the parietal episodic memory (EM) effect, an index of recollection. Repetition of familiar, but not unfamiliar, symbols elicited a reduction in the novelty P3. Better recognition performance for the familiar symbols was associated with a robust parietal EM effect, which was absent for the unfamiliar symbols in the incidental task. These data demonstrate that processing of novel events depends on expectation and whether stimuli have preexisting representations in long-term semantic memory.

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