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Hazeltine E, Poldrack R, Gabrieli JD.

Neural Activation During Response Competition

fMRIDC Accession Number: 2-2000-11173
Journal of Cognitive Neuroscience 2000 Nov ;12(suppl. 2): p.118-129
View entire article (off-site link)
PubMed ID: 11506652 (off-site link)
 Study Meta-Data

The flanker task, introduced by Eriksen and Eriksen [Eriksen, B. A., & Eriksen, C. W. (1974). Effects of noise letters upon the identification of a target letter in a nonsearch task. Perception & Psychophysics, 16, 143-149], provides a means to selectively manipulate the presence or absence of response competition while keeping other task demands constant. We measured brain activity using functional magnetic resonance imaging (fMRI) during performance of the flanker task. In accordance with previous behavioral studies, trials in which the flanking stimuli indicated a different response than the central stimulus were performed significantly more slowly than trials in which all the stimuli indicated the same response. This reaction time effect was accompanied by increases in activity in four regions: the right ventrolateral prefrontal cortex, the supplementary motor area, the left superior parietal lobe, and the left anterior parietal cortex. The increases were not due to changes in stimulus complexity or the need to overcome previously learned associations between stimuli and responses. Correspondences between this study and other experiments manipulating response interference suggest that the frontal foci may be related to response inhibition processes whereas the posterior foci may be related to the activation of representations of the inappropriate responses.

Supplemental Information

Language: English
fMRIDC Comments: Flanker task response competition Dataset Size: 60M Available on 2 CDs
Country: USA
Magnetic Field Strength: 1.5T
Scanner Manufacturer: GE Signa
Analysis Software: SPM 96
Cognitive Domain: Attention
Subjects: 8
Age Range: 18-24
Functional Runs: 1
Has anatomical data
Has behavioral data
Has raw image data
Has high-res images
Has preprocessed image data
Results Images: Individual Subjects
Comments on Neural Activation During Response Competition by interch on August 23, 2006 @05:39
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