Journal article
Material-dependent and material-independent selection processes in the frontal and parietal lobes: an event-related fMRI investigation of response competition
Neuropsychologia, Vol.41(9), pp.1208-1217
2003
DOI: 10.1016/S0028-3932(03)00040-X
PMID: 12753960
Abstract
The present study used the flanker task [Percept. Psychophys. 16 (1974) 143] to identify neural structures that support response selection processes, and to determine which of these structures respond differently depending on the type of stimulus material associated with the response. Participants performed two versions of the flanker task while undergoing event-related functional magnetic resonance imaging (fMRI). Both versions of the task required participants to respond to a central stimulus regardless of the responses associated with simultaneously presented flanking stimuli, but one used colored circle stimuli and the other used letter stimuli. Competition-related activation was identified by comparing Incongruent trials, in which the flanker stimuli indicated a different response than the central stimulus, to Neutral stimuli, in which the flanker stimuli indicated no response. A region within the right inferior frontal gyrus exhibited significantly more competition-related activation for the color stimuli, whereas regions within the middle frontal gyri of both hemispheres exhibited more competition-related activation for the letter stimuli. The border of the right middle frontal and inferior frontal gyri and the anterior cingulate cortex (ACC) were significantly activated by competition for both types of stimulus materials. Posterior foci demonstrated a similar pattern: left inferior parietal cortex showed greater competition-related activation for the letters, whereas right parietal cortex was significantly activated by competition for both materials. These findings indicate that the resolution of response competition invokes both material-dependent and material-independent processes.
Details
- Title: Subtitle
- Material-dependent and material-independent selection processes in the frontal and parietal lobes: an event-related fMRI investigation of response competition
- Creators
- Eliot Hazeltine - NASA Ames Research Center, Mail Stop 262-4, Moffett Field, CA 94035, USASilvia A Bunge - Neurosciences Program, Stanford University, Stanford, CA, USAMichael D Scanlon - Department of Psychology, Stanford University, Stanford, CA, USAJohn D.E Gabrieli - Neurosciences Program, Stanford University, Stanford, CA, USA
- Resource Type
- Journal article
- Publication Details
- Neuropsychologia, Vol.41(9), pp.1208-1217
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/S0028-3932(03)00040-X
- PMID
- 12753960
- ISSN
- 0028-3932
- eISSN
- 1873-3514
- Language
- English
- Date published
- 2003
- Academic Unit
- Psychological and Brain Sciences; Iowa Neuroscience Institute
- Record Identifier
- 9984070307602771
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