PMID: 9545660Apr 18, 1998Paper

Responses to irrelevant probes during task-induced negative and positive shifts

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
E P BakayL Balázs

Abstract

The functional significance of task-induced negative and positive cortical shifts were tested with the probe-stimulus method. Both shifts were induced within the same experimental situation in three variants of a CNV paradigm, where a slow positive wave (a variant of P300) appeared following S2. In Experiment I and II, S2 called for making or withholding a motor response (go/no-go); in Experiment III, S2 informed the subject about the correctness of a previous guess. Irrelevant probe-stimuli were applied in conjunction with the task during the CNV, the post-S2 positivity and the intertrial interval (ITI). The probe-evoked vertex EPs were smaller during the post-S2 positivity as compared to the CNV and the ITI. This was true not only for the motor task but also for the guessing task, where the effect is unlikely to have been contaminated by motor potentials. This indicates that positive shifts have an inhibitory effect on the processing of irrelevant probe-stimuli and possibly on information-processing in general.

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Citations

Jan 26, 2002·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Patrick E GoodeJuan Pascual-Leone
Feb 12, 2008·Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc·Saverio LigatoRichard W Cartun
Jan 20, 2006·Canadian Journal on Aging = La Revue Canadienne Du Vieillissement·Norm O'Rourke

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