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Memory-induced modulation of event-related potentials in frontal cortex of human subjects: a divided visual field
Anna Nowicka1, Iwona Szatkowska
1Laboratory of Psychophysiology, Department of Neurophysiology, Nencki Institute of Experimental Biology, 3, Pasteur Street, 02-093 Warsaw, Poland. nowicka@nencki.gov.pl
Abstract:
The aim of the present study was to test whether memory processes depend on which hemisphere initiates processing of visual information. Event-related potentials (ERPs) to laterally displayed stimuli (words and Kanji) were recorded from symmetrical sites over the left (LH) and right hemisphere (RH), i.e. the hemisphere contralateral and ipsilateral to the visual field of stimulus presentation. ERP recordings for the new and repeated stimuli were compared. A memory-related modulation of ERPs was found for frontal recording sites. The late ERP repetition effect, however, was present in the ERP data only in the case of the direct stimulation of the competent hemisphere, i.e. the LH for words and RH for Kanji. Stimulation of the incompetent hemisphere resulted in lack of the repetition effect in either hemisphere.
