Journal
PSYCHOPHYSIOLOGY
Volume 48, Issue 4, Pages 559-568Publisher
WILEY
DOI: 10.1111/j.1469-8986.2010.01115.x
Keywords
Advance preparation; Task-switching; RT distribution; Single trial ERP
Funding
- University of Newcastle Research Grants Committee
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We examined whether the cue-locked centroparietal positivity is associated with switch-specific or general preparation processes. If this positivity (300-400 ms) indexes switch-specific preparation, faster switch trials associated with smaller RT switch cost should have a larger positivity as compared to slower switch trials, but no such association should be evident for repeat trials. We extracted ERP waveforms corresponding to semi-deciles of each participant's RT distribution (i.e., fastest to slowest 5% of trials) for switch and repeat conditions. Consistent with a switch-specific preparation process, centroparietal positivity amplitude was linked to slower RT and larger RT switch cost for switch but not repeat trials. A later pre-target negativity (500-600 ms) was inversely correlated with RT for both switch and repeat trials, consistent with a general anticipatory preparation processes.
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