Modulation of conflict related ERP components in the stroop and flanker tasks by nature of the response conflict
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1
Hebrew University, Israel
Extensive research with functional magnetic resonance imaging suggested that the anterior cingulate cortex (ACC) is in charge of detecting response conflicts in response interference tasks, such as the Stroop and flanker tasks. EEG studies of the Stroop and flanker tasks, identified a fronto-central negative peak with the conflict detection processes (termed N200 or N450, for the flanker and Stroop tasks respectively), and localized this negativity to the ACC. An important assumption is that a single neural mechanism is in charge of conflict detection in all conflict tasks regardless of the nature of the task. In contrast, the Dimension-Action (DA) model (Magen & Cohen, 2007) challenges this claim and contends that multiple response selection mechanisms exist, each dedicated to a distinct visual module. Thus, different tasks may elicit distinct conflict detection processes, depending on the locus of the conflict. Here, we used EEG to examine the scalp distribution of the conflict negativity in conflict tasks occurring in two distinct modules: the verbal module (in the classic Stroop and verbal flanker tasks) and the color module (in a color flanker task). Our results (n =36) showed that the conflict negativity had similar scalp topographies for the two verbal tasks (Stroop and verbal flanker), which differed from the color flanker task. The results provide the first evidence that distinct neural generators may be in charge of conflict detection when the response conflict occurs within the color and verbal modules.
Keywords:
cognitive control,
ERP
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Performance Monitoring and Cognitive Control
Citation:
Magen
H,
Cohen
A and
Deouell
L
(2011). Modulation of conflict related ERP components in the stroop and flanker tasks by nature of the response conflict.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00265
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Received:
21 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Hagit Magen, Hebrew University, Jerusalem, Israel, msmagen@mscc.huji.ac.il