Poster D32, Monday, March 26, 8:00-10:00 am, Exhibit Hall C
Does conflict adaptation affect stimulus or response selection?
Melissa Moss1, Atsushi Kikumoto1, Ulrich Mayr1; 1University of Oregon
The conflict-adaptation effect (reduced response-time costs of conflict resolution following high-conflict trials) suggests that the experience of conflict may drive subsequent increases in control by triggering goal representation to be actively updated, which would reduce sensitivity to subsequent conflict (Botvinick et al., 2001). This effect may be due to modulation of stimulus processing, or of post-stimulus response selection. With EEG, we investigated the temporal dynamics of conflict adaptation using a flanker-like task in which the distractor (flanker) appeared 400ms before the target (Weissman et al., 2014). In this task, alternating flanker-target pairs by trial eliminates the potential confound of low-level stimulus-response priming. Thus, our study was able to focus in on the top-down aspects of conflict processing. We predicted that conflict adaptation during stimulus selection would be reflected in reduced amplitudes of early visually evoked potentials (e.g., P1/N1 ERP components) in response to the flanker stimulus, following conflict. Preliminary findings showed a robust behavioral conflict-adaptation effect, in both response times and accuracy rate. However, we found no influence of previous conflict on ERP amplitudes in response to the flanker stimulus, indicating that stimulus selection is not affected by conflict-adaptation. Instead, our findings are consistent with the interpretation that adaptation affects response-selection processes and may result from episodic memory traces that encapsulate previous-trial control efforts.
Topic Area: EXECUTIVE PROCESSES: Monitoring & inhibitory control