A carry-over task rule in task switching: An ERP investigation using a Go/Nogo paradigm |
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Authors: | Kaoru Umebayashi Tsunetaka Okita |
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Affiliation: | 1. Department of Home and Life Sciences, Gifu Women''s University, 80, Taromaru, Gifu City 501-2592, Japan;2. Aichi Shukutoku University, Japan |
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Abstract: | Investigations of executive control using a task-switching paradigm have consistently found longer reaction times for task-switch trials than task-repetition trials. This switch cost may result from interference by a stimulus-response (SR) rule carried over from the preceding alternative task. We examined event-related brain potential (ERP) evidence for such carry-over effects using a combined paradigm of task switching with Go/Nogo; Nogo trials, which require no response execution, should expose carry-over effects from preceding trials. On Go trials, twelve participants performed a button-pressing task in compatible (hand and signal direction consistent) and incompatible conditions, which switched predictably every three trials. Reaction times were longer on switch than on repetition trials. On compatible switch trials, a stimulus-locked lateralized readiness potential (sLRP) for Nogo stimuli revealed a positive dip, suggesting incorrect response activation in the early automatic process that was induced by a SR rule carried over from the preceding task. |
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Keywords: | Task switching Event-related brain potential Lateralized readiness potential Go/Nogo Carry-over effect |
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