期刊
INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY
卷 55, 期 2, 页码 191-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpsycho.2004.07.005
关键词
ADJAR; event-related potentials; overlap; response inhibition; stop-signal task; N1; P3
In the stop-signal task, subjects should withhold their response in a choice reaction time task when a stop-signal, usually a tone, is presented. Successful stops have been associated with event-related potentials (ERPs) featuring a larger frontocentral positivity relative to failed stops. The functional interpretation of this stop-P3 has been disputed, because stop-ERPs are distorted by overlap from ERPs elicited by preceding go-stimuli. We effectively removed confounding potentials with the,adjacent response filter method (ADJAR)'. Confirming an interpretation in terms of response inhibition, the stop-P3 remained and overlap removal resulted in a more anterior distribution. As a new finding, the NI was larger on trials with successful stops, which suggests that inhibitory performance at least partly depended on the ability to switch attention to the stop-signal. Finally, the parietal P3 tended to peak earlier for successful than for failed stops. This is in line with the Horse Race Model, which states that faster stop-processes have a higher chance of winning the race against the go-process. (C) 2004 Elsevier B.V. All rights reserved.
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