W S Pritchard1, M E Houlihan, J H Robinson. 1. Research and Development, R.J. Reynolds Tobacco Company, Winston-Salem, NC 27102, USA. pritchw@rjrt.com
Abstract
PURPOSE: The most prevalent current view of the functional role of the P300 component of the event-related potential (ERP) is that it indexes strategic processing related to context updating. Using independent-components analysis (ICA), the present study examined the role of P300 in the tactical process of response selection. METHODS: In a task crossing manipulations of perceptual difficulty (PD) and response-selection difficulty (R-SD), ICA was employed to measure not only P300 latency, but its onset and duration as well. RESULTS: Increased PD delayed P300 latency and onset in parallel, while increased R-SD lengthened P300 duration. CONCLUSIONS: The latency and onset results suggest that the often-cited covariation of P300 latency with stimulus-evaluation time is secondary to effects on processing stages preceding P300. The results for duration indicate that P300 is involved in response selection, suggesting that it is not a unitary phenomenon. While P300's well-known relation to stimulus probability indicates a strategic role, our findings indicate a tactical role as well.
PURPOSE: The most prevalent current view of the functional role of the P300 component of the event-related potential (ERP) is that it indexes strategic processing related to context updating. Using independent-components analysis (ICA), the present study examined the role of P300 in the tactical process of response selection. METHODS: In a task crossing manipulations of perceptual difficulty (PD) and response-selection difficulty (R-SD), ICA was employed to measure not only P300 latency, but its onset and duration as well. RESULTS: Increased PD delayed P300 latency and onset in parallel, while increased R-SD lengthened P300 duration. CONCLUSIONS: The latency and onset results suggest that the often-cited covariation of P300 latency with stimulus-evaluation time is secondary to effects on processing stages preceding P300. The results for duration indicate that P300 is involved in response selection, suggesting that it is not a unitary phenomenon. While P300's well-known relation to stimulus probability indicates a strategic role, our findings indicate a tactical role as well.
Authors: Kathryn A Moores; C Richard Clark; Jo L M Hadfield; Greg C Brown; D James Taylor; Sean P Fitzgibbon; Andrew C Lewis; Darren L Weber; Richard Greenblatt Journal: Hum Brain Mapp Date: 2003-01 Impact factor: 5.038
Authors: Dandan Zhang; Ruolei Gu; Tingting Wu; Lucas S Broster; Yi Luo; Yang Jiang; Yue-jia Luo Journal: Neuropsychologia Date: 2013-05-02 Impact factor: 3.139