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dc.contributor.authorNeumann, DL
dc.contributor.authorLipp, OV
dc.contributor.authorSiddle, DAT
dc.description.abstractThe effect that the difficulty of the discrimination between task-relevant and task-irrelevant stimuli has on the relationship between skin conductance orienting and secondary task reaction time (RT) was examined. Participants (N = 72) counted the number of longer-than-usual presentations of one shape (task-relevant) and ignored presentations of another shape (task-irrelevant). The difficulty of discriminating between the two shapes varied across three groups (low, medium, and high difficulty). Simultaneous with the primary counting task, participants performed a secondary RT task to acoustic probes presented 50, 150, and 2000 ms following shape onset. Skin conductance orienting was larger, and secondary RT at the 2000 ms probe position was slower during task-relevant shapes than during task-irrelevant shapes in the low-difficulty group. This difference declined as the discrimination difficulty was increased, such that there was no difference in the high-difficulty group. Secondary RT was slower during task-irrelevant shapes than during task-relevant shapes only in the medium-difficulty group - and only at the 150 ms probe position in the first half of the experiment. The close relationship between autonomic orienting and secondary RT at the 2000 ms probe position suggests that orienting reflects the resource allocation that results from the number of matching features between a stimulus input and a mental representation primed as significant.
dc.publisherHogrefe & Huber Publishers
dc.publisher.placeUnited States
dc.relation.ispartofjournalJournal of Psychophysiology
dc.subject.fieldofresearchCognitive and computational psychology
dc.titleDiscriminating Between Task-Relevant and Task-Irrelevant Stimuli: The Effects on Autonomic Orienting and Secondary Task Reaction Time
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2002 Hogrefe & Huber Publishers. Self-archiving of the author-manuscript version in an Institutional Repository is not yet supported by this publisher. Please refer to the journal link for access to the definitive, published version or contact the author for more information.
gro.hasfulltextNo Full Text
gro.griffith.authorNeumann, David L.

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