ERP correlates of complex human decision making in a gambling paradigm: detection and resolution of conflict.

The present event-related potential study investigated the correlates of decision making in relation to the amount of response conflict. In a gambling paradigm, response conflict was introduced by giving participants the option to either gamble or pass. Second, the odds and gains in each trial were manipulated to make the decision to gamble or pass determined or underdetermined. Underdetermined trials included an extra conflict. The N2 was modulated by the mere presence of conflict. In contrast to both conflict monitoring and inhibition theories for N2, these results suggest that an enhancement in N2 reflects the mere detection of conflicting alternatives. The P3 showed a fronto-central increase in amplitude in trials including two forms of response conflict compared to trials including only one conflict. These findings suggest that P3 reflects part of the conflict resolution processes.

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