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The neural dynamics of stimulus and response conflict processing as a function of response complexity and task demands.

dc.contributor.author Appelbaum, Lawrence Gregory
dc.contributor.author Donohue, Sarah
dc.contributor.author McKay, CC
dc.contributor.author Woldorff, Marty G
dc.coverage.spatial England
dc.date.accessioned 2016-05-11T19:54:11Z
dc.date.issued 2016-04
dc.identifier http://www.ncbi.nlm.nih.gov/pubmed/26827917
dc.identifier S0028-3932(16)30033-1
dc.identifier.uri https://hdl.handle.net/10161/12003
dc.description.abstract Both stimulus and response conflict can disrupt behavior by slowing response times and decreasing accuracy. Although several neural activations have been associated with conflict processing, it is unclear how specific any of these are to the type of stimulus conflict or the amount of response conflict. Here, we recorded electrical brain activity, while manipulating the type of stimulus conflict in the task (spatial [Flanker] versus semantic [Stroop]) and the amount of response conflict (two versus four response choices). Behaviorally, responses were slower to incongruent versus congruent stimuli across all task and response types, along with overall slowing for higher response-mapping complexity. The earliest incongruency-related neural effect was a short-duration frontally-distributed negativity at ~200 ms that was only present in the Flanker spatial-conflict task. At longer latencies, the classic fronto-central incongruency-related negativity 'N(inc)' was observed for all conditions, but was larger and ~100 ms longer in duration with more response options. Further, the onset of the motor-related lateralized readiness potential (LRP) was earlier for the two vs. four response sets, indicating that smaller response sets enabled faster motor-response preparation. The late positive complex (LPC) was present in all conditions except the two-response Stroop task, suggesting this late conflict-related activity is not specifically related to task type or response-mapping complexity. Importantly, across tasks and conditions, the LRP onset at or before the conflict-related N(inc), indicating that motor preparation is a rapid, automatic process that interacts with the conflict-detection processes after it has begun. Together, these data highlight how different conflict-related processes operate in parallel and depend on both the cognitive demands of the task and the number of response options.
dc.language eng
dc.relation.ispartof Neuropsychologia
dc.relation.isversionof 10.1016/j.neuropsychologia.2016.01.035
dc.subject Conflict
dc.subject EEG
dc.subject Flanker
dc.subject LPC
dc.subject LRP
dc.subject N2
dc.subject N450
dc.subject Stroop
dc.subject Brain
dc.subject Conflict (Psychology)
dc.subject Electroencephalography
dc.subject Evoked Potentials
dc.subject Executive Function
dc.subject Female
dc.subject Humans
dc.subject Language
dc.subject Male
dc.subject Neuropsychological Tests
dc.subject Reaction Time
dc.subject Space Perception
dc.subject Young Adult
dc.title The neural dynamics of stimulus and response conflict processing as a function of response complexity and task demands.
dc.type Journal article
pubs.author-url http://www.ncbi.nlm.nih.gov/pubmed/26827917
pubs.begin-page 14
pubs.end-page 28
pubs.organisational-group Clinical Science Departments
pubs.organisational-group Duke
pubs.organisational-group Duke Institute for Brain Sciences
pubs.organisational-group Duke Science & Society
pubs.organisational-group Initiatives
pubs.organisational-group Institutes and Provost's Academic Units
pubs.organisational-group Psychiatry & Behavioral Sciences
pubs.organisational-group Psychiatry & Behavioral Sciences, Brain Stimulation and Neurophysiology
pubs.organisational-group School of Medicine
pubs.organisational-group University Institutes and Centers
pubs.publication-status Published
pubs.volume 84
dc.identifier.eissn 1873-3514


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