Neuroscience 2004 Abstract
| Presentation Number: | 200.19 |
|---|---|
| Abstract Title: | Effector specificity of actual and imagery finger tapping tasks: A functional MRI study. |
| Authors: |
Hanakawa, T.*1
; Fukuyama, H.1
1Human Brain Reseach Ctr., Kyoto Univ. Grad. Sch. Med, Kyoto, Japan |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Perception and imagery |
| Session: |
200. Perception and Imagery I Poster |
| Presentation Time: | Sunday, October 24, 2004 10:00 AM-11:00 AM |
| Location: | San Diego Convention Center - Hall A-H, Board # HH26 |
| Keywords: | MOTOR CORTEX, MOVEMENT, ACTIVATION, PREMOTOR |
Accumulating evidence indicates that motor execution and imagery substantially share the underlying neural substrates, but the extent of overlap is still under debate. To clarify this issue further from the viewpoint of effector specificity or somatotopy of the motor system, we performed a functional MRI experiment in 4 healthy right-handed volunteers. On a 3-T MRI scanner, the subjects performed actual and imaginary sequential tapping guided by a series of visual number stimuli presented at 0.6 Hz. An experimental session consisted of eight 30-s task blocks (semi-randomized for execution and imagery blocks) alternated with baseline fixation periods. Task performance of both movement and imagery tasks was checked at the end of each task period through responses from the subjects. Two fMRI sessions were conducted separately for each hand. Echoplanar images (TR = 3 s) were acquired with prospective acquisition correction. Statistical parametric mapping revealed brain areas more activated during the right hand movement task over the left hand movement task mainly in the left central areas including the premotor, primary motor and anterior parietal cortices. Parts of the premotor and parietal areas encompassed within this central activity showed greater activity for the right hand imagery task than the left hand imagery task, but the hand-knob part of the precentral gyrus did not. A similar result was obtained for the left versus right contrast. The present experiment indicates that both motor execution and imagery retain motor somatotopy and their neural substrates are overlapped partially.
Supported by Grants-in-Aid for Scientific Research for Young Scientists (B) to T.H. (15700257) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan
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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