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Article Abstract
Objective: Current debate centres on the inhibitory and conflict interpretations of the N2 and P3 components of the event-related potential (ERP). We examined behavioural responses and ERPs in a cued-Go/NoGo task.
Methods: Participants were required to inhibit a planned response (NoGo target after Go cue), change a planned response to a different one (Invalid cueing), and activate an unexpected response (Go target after NoGo cue).
Results: Responses were slower when participants had to change a planned response, and execute an unplanned response. N2 was more negative whenever the presented target required a different response to what was expected based on the cue. In contrast, P3 was increased when participants had to change or inhibit a planned response, but not when executing a response where none was planned.
Conclusions: N2 results lend support to the conflict account, while P3 reflects cancellation of a planned response.
Significance: This paper provides the first test of conflict involving activation of an unplanned response in a cued-Go/NoGo task.
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| http://dx.doi.org/10.1016/j.clinph.2011.05.012 | DOI Listing |
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