Abstract:
:Brain-potential correlates of response conflict are well documented, but those of task conflict are not. Task-switching studies have suggested a plausible correlate of task conflict--a poststimulus posterior negativity--however, in such paradigms the negativity may also reflect poststimulus task-set reconfiguration postulated in some models. Here, participants alternated between single-task blocks of classifying letters and digits; hence, no within-block task-set reconfiguration was required. Presenting letters alongside digits slowed responses to the digits and elicited an ERP negativity from ≈ 350 ms, relative to task-neutral symbols presented alongside digits, consistent with task conflict. The negativity was also present for congruent digit-letter stimuli; this and the lack of behavioral response congruency effects indicate conflict at the level of task-set rather than response selection.
journal_name
Psychophysiologyjournal_title
Psychophysiologyauthors
Elchlepp H,Rumball F,Lavric Adoi
10.1111/psyp.12015subject
Has Abstractpub_date
2013-03-01 00:00:00pages
314-23issue
3eissn
0048-5772issn
1540-5958journal_volume
50pub_type
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