Neuroscience 2001 Abstract
| Presentation Number: | 303.9 |
|---|---|
| Abstract Title: | The reactional-movement related cortical potential(R-MRCP) proceeding reaction jump stimulated by light signal. |
| Authors: |
Nakaya, D.*1
; Mori, A.2
; Yoshimoto, T.2
; Jujho, A.3
1Dept Motor Physiol, Nihon Univ Grad Sch Lit & Soc Sci, Tokyo, Japan 2College of Humanities and Sciences, Nihon Univ, Tokyo, Japan 3Dept Human and Social Sciences, Mejiro Univ, Tokyo, Japan |
| Primary Theme and Topics |
Motor Systems - Control of Posture and Movement -- EMG Activity |
| Session: |
303. Control of posture and movement: EMG activity--descending control of motor neurons Poster |
| Presentation Time: | Monday, November 12, 2001 8:00 AM-9:00 AM |
| Location: | Exhibit Hall SS-33 |
| Keywords: | MOVEMENT, EEG, MOTORCORTEX, MRI |
This study was to investigate the relationship between the localization of neuronal activity in the cortex and the reaction time.The subjects were 4 males and 1 female. The movement task was a reaction jump to a light stimulus. Electroencephalograms (EEGs) were recorded from 19ch on the scalp according to the international 10-20 system. All EEGs were divided according to fast and slow reaction times and an average time was calculated. The average times for both fast and slow were recorded 1.5sec before to 0.5sec after each of the stimulation. The results were then analyzed by the dipole tracing method (DT). The DT results were overlapped with the magnetic resonance imaging (MRI) of each subject to determine the neuronal activity areas and its localization was determined using topography. The most negative amplitude of the fast reaction jump measured at Cz was significantly higher than in the slow reaction jump. The peak latency of the fast reaction measured at Cz was significantly earlier than in the slow reaction jump. In the fast reaction jump, the current dipole sources were especially localized in the leg areas of the motor cortex (MCx) at Cz from 30msec before onset of the EMG. However, in the slow reaction jump the current dipole sources were poorly localized at Cz. The data showed that, the fast reaction had high negative potential at the Cz onset of the EMG, and the current dipole sources were remarkably localized in the leg areas of the MCx. The peak latency of the fast reaction was higher and earlier than in the slow reaction jump.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2001 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2001. Online.
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