Neuroscience 2004 Abstract
| Presentation Number: | 899.10 |
|---|---|
| Abstract Title: | Preparatory and controlled response selection sub-processes identified with functional magnetic resonance imaging. |
| Authors: |
Schumacher, E. H.*1
; Cole, M. W.2
; D'Esposito, M.3
1Sch. of Psychology, Georgia Inst. of Psychology, Atlanta, GA 2PA, 654 Cherry Street, 30332-0170, 3USA, 654 Cherry Street, 30332-0170, |
| Primary Theme and Topics |
Cognition and Behavior - Human and Animal Cognition and Behavior -- Executive function |
| Session: |
899. Executive Functions: Other Poster |
| Presentation Time: | Wednesday, October 27, 2004 9:00 AM-10:00 AM |
| Location: | San Diego Convention Center - Hall A-H, Board # SS32 |
| Keywords: | WORKING MEMORY, FRONTAL CORTEX, PARIETAL CORTEX, FUNCTIONAL MRI |
Selecting an appropriate response among competing alternatives is fundamental to the successful performance of a variety of everyday tasks. Cognitive neuroscience has begun to investigate the neural mechanisms for this response selection process. Current research suggests a frontal-parietal network of brain regions (including dorsal prefrontal, dorsal premotor, and superior parietal cortices) mediate response selection, at least for spatial material. Most of these studies used blocked experimental designs, comparing blocks of a difficult response-selection task with blocks of an easy one. Thus, the frontal-parietal activity reported may be due either to the activation of the stimulus-response rule sets, or to the application of the stimulus-response rules. Our current event-related fMRI study investigates these response selection sub-processes. In it, participants responded to a visually presented stimulus with either a spatially ordered (easy) or unordered (hard) manual response. On some trials, 4 to 9 seconds prior to stimulus onset, participants were cued that the upcoming task would be easy or hard. In this way we may separate brain activity related to the preparation for the upcoming response (i.e., stimulus-response set activation) from brain activity related to the onset of the stimulus (stimulus-response rule application). Dorsal premotor and superior parietal cortices showed increased activity for the hard relative to easy task when the cue was presented, suggesting these regions mediate preparatory processes related to stimulus-response set activation; whereas dorsal prefrontal cortex showed increased activity for the hard task only after stimulus presentation, suggesting this region may mediate stimulus-response rule application.
Supported by NIH
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2004 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2004. Online.
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