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Sequence-sensitive subcomponents of P300: Topographical analyses and dipole source localization

Published online by Cambridge University Press:  06 July 2001

INES JENTZSCH  and
WERNER SOMMER
INES JENTZSCH
Affiliation:
Department of Psychology, Humboldt-University Berlin, Germany
WERNER SOMMER
Affiliation:
Department of Psychology, Humboldt-University Berlin, Germany
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Abstract

P300 amplitude and reaction time (RT) are strongly affected by the sequence of events preceding the eliciting stimulus. Sommer, Leuthold and Soetens (1999) found that robust sequential effects in P300 amplitude could be dissociated from more variable sequential effects in RTs. However, global changes in P300 amplitude and topography gave rise to the suggestion that sequential effects are specific for a subcomponent of P300 that is separate from and anterior to the classical parietal P300. Here, confirming evidence for dissociable subcomponents of P300 is reported from two experiments. Independent component analysis separated a centrally distributed sequence-sensitive subcomponent from a more parietal subcomponent. Subsequent dipole source analysis indicated a deep mesial source for the sequence-sensitive subcomponent. Overlap with reafferent somatosensory activity appears to be responsible for an apparent lateralization of this component towards the hemisphere ipsilateral to the responding hand.

Keywords

P300Movement-related potentialsSequential effectsICASource localization
Type
Research Article
Information
Psychophysiology , Volume 38 , Issue 4 , July 2001 , pp. 607 - 621
Copyright
2001 Society for Psychophysiological Research

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