The dynamics of proactive and reactive cognitive control processes in the human brain.

dc.contributor.author

Appelbaum, L Gregory

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Boehler, C Nicolas

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Davis, Lauren A

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Won, Robert J

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Woldorff, Marty G

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United States

dc.date.accessioned

2016-05-11T20:04:47Z

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2014-05

dc.description.abstract

In this study, we leveraged the high temporal resolution of EEG to examine the neural mechanisms underlying the flexible regulation of cognitive control that unfolds over different timescales. We measured behavioral and neural effects of color-word incongruency, as different groups of participants performed three different versions of color-word Stroop tasks in which the relative timing of the color and word features varied from trial to trial. For this purpose, we used a standard Stroop color identification task with equal congruent-to-incongruent proportions (50%/50%), along with two versions of the "Reverse Stroop" word identification tasks, for which we manipulated the incongruency proportion (50%/50% and 80%/20%). Two canonical ERP markers of neural processing of stimulus incongruency, the frontocentral negative polarity incongruency wave (NINC) and the late positive component (LPC), were evoked across the various conditions. Results indicated that color-word incongruency interacted with the relative feature timing, producing greater neural and behavioral effects when the task-irrelevant stimulus preceded the target, but still significant effects when it followed. Additionally, both behavioral and neural incongruency effects were reduced by nearly half in the word identification task (Reverse Stroop 50/50) relative to the color identification task (Stroop 50/50), with these effects essentially fully recovering when incongruent trials appeared only infrequently (Reverse Stroop 80/20). Across the conditions, NINC amplitudes closely paralleled RTs, indicating this component is sensitive to the overall level of stimulus conflict. In contrast, LPC amplitudes were largest with infrequent incongruent trials, suggesting a possible readjustment role when proactive control is reduced. These findings thus unveil distinct control mechanisms that unfold over time in response to conflicting stimulus input under different contexts.

dc.identifier

http://www.ncbi.nlm.nih.gov/pubmed/24345171

dc.identifier.eissn

1530-8898

dc.identifier.uri

https://hdl.handle.net/10161/12008

dc.language

eng

dc.publisher

MIT Press - Journals

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J Cogn Neurosci

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10.1162/jocn_a_00542

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Adolescent

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Adult

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Brain

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Cognition

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Female

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Humans

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Male

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Photic Stimulation

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Psychomotor Performance

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Reaction Time

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Young Adult

dc.title

The dynamics of proactive and reactive cognitive control processes in the human brain.

dc.type

Journal article

duke.contributor.orcid

Appelbaum, L Gregory|0000-0002-3184-6725

duke.contributor.orcid

Woldorff, Marty G|0000-0002-2683-4551

pubs.author-url

http://www.ncbi.nlm.nih.gov/pubmed/24345171

pubs.begin-page

1021

pubs.end-page

1038

pubs.issue

5

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Basic Science Departments

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Center for Cognitive Neuroscience

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Clinical Science Departments

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Duke

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Duke Institute for Brain Sciences

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Duke Science & Society

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Duke-UNC Center for Brain Imaging and Analysis

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Initiatives

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Institutes and Centers

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Institutes and Provost's Academic Units

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Neurobiology

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Psychiatry & Behavioral Sciences

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Psychiatry & Behavioral Sciences, Brain Stimulation and Neurophysiology

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Psychiatry & Behavioral Sciences, Translational Neuroscience

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Psychology and Neuroscience

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School of Medicine

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Trinity College of Arts & Sciences

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University Institutes and Centers

pubs.publication-status

Published

pubs.volume

26

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