Stimulus and Response-Locked P3 Activity in a Dynamic Rapid Serial Visual Presentation (RSVP) Task

Report No. ARL-TR-6314
Authors: Anthony J. Ries; Gabriella Brick Larkin
Date/Pages: January 2013; 26 pages
Abstract: The current study evaluated the relationship between reaction time performance and the visual target-evoked P3 event-related potential (ERP) using a dynamic rapid serial visual presentation (RSVP) task. Electroencephalography (EEG) and reaction time measures were obtained while observers monitored an RSVP stream of short videos for infrequent targets presented among frequent nontarget distractors. Observers reaction time quartiles were used as ERP binning parameters for target- and response-locked EEG epochs. This procedure allowed us to assess neural activity related to perceptual and response processing across different levels of overt performance. P3 amplitude and latency were evaluated for both stimulus and response-locked averages. The results showed that the peak latency of the stimulus-locked P3 was maximal over central parietal electrode Pz and was significantly different between each quartile; however, these latency differences were absent when P3 latency was measured in the response-locked data. The P3 amplitude analysis revealed no significant differences between stimulus and response-locked averages within each quartile. Overall, the results suggest the peak latency of the P3 obtained in the current study reflects processes more associated with motor planning and response execution.
Distribution: Approved for public release
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Last Update / Reviewed: January 1, 2013