Neuroscience 2000 Abstract
| Presentation Number: | 560.3 |
|---|---|
| Abstract Title: | Cerebellar activation distinguishes sensorimotor task difficulty in functional MRI. |
| Authors: |
Fuchs, A.*1
; Mayville, J. M.1
; Purcott, K. L.1
; Steinberg, F.1,2
; Kelso, J. A. S.1
1Center for Complex Systems & Brain Sciences, Florida Atlantic University, Boca Raton, FL 2University MRI, Boca Raton, FL |
| Primary Theme and Topics |
I. Neural Basis of Behavior - 105. Cognition: higher functions |
| Secondary Theme and Topics | G. Motor Systems and Sensorimotor Integration<br />- 88. Cerebellum |
| Session: |
560. Cognition: higher functions II Poster |
| Presentation Time: | Tuesday, November 7, 2000 3:00 PM-4:00 PM |
| Location: | Hall G-J |
| Keywords: | MOTOR COORDINATION, CEREBELLUM ACTIVATION, MOVEMENT RHYTHM |
We used functional MRI to study cerebellar activity during three bimanual coordination tasks: Syncopation at 1.33Hz and synchronization at 1.33Hz and 2.66Hz. Previous research (EEG & MEG) shows that spatiotemporal patterns of brain activation depend on both coordination frequency and the mode of coordination (syncopation or synchronization). Participants coordinated bimanual finger-thumb opposition either on-the-beat (synchronize) or in-between two consecutive beats (syncopate). We used the noise (pings) produced by the scanner (Signa 1.5T, GE Inc.) as auditory stimuli. The repetition time (TR) and number of slices was set in each condition such that the pings took place at the desired frequency, i.e. at 1.33Hz and 2.66Hz. Behavioral performance was monitored as pressure changes in two small air pillows which the subjects were holding between the thumb, and the index and middle finger of each hand. This signal was compared to the time points of pulses produced by the scanner when taking a slice. Results showed that the size of the activated volume in the cerebellum was similar for the two synchronize conditions but much larger for syncopation. Also the amplitude of the fMRI signal during task execution (compared to rest) was significantly larger for syncopation than for synchronization. Both findings indicate the strong involvement of subcortical structures in coordination and timing of actions and even reflect task difficulty.
Supported by National Institute of Mental Health
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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