Neuroscience 2000 Abstract
| Presentation Number: | 254.4 |
|---|---|
| Abstract Title: | Information coding of the striatal neurons during sequential movement. |
| Authors: |
Samejima, K.*1
; Ueda, Y.2
; Kimura, M.2
; Doya, K.3
; Schweighofer, N.1
1ERATO, JST, Kyoto, Japan 2Faculty of Healsh Sport Sci., Osaka Univ., Osaka, Japan 3Information Sci. Div., ATR-I, Kyoto, Japan |
| Primary Theme and Topics |
G. Motor Systems and Sensorimotor Integration - 87. Basal ganglia |
| Secondary Theme and Topics | I. Neural Basis of Behavior<br />- 108. Learning and memory: physiology |
| Session: |
254. Basal ganglia: activity patterns and plasticity Poster |
| Presentation Time: | Monday, November 6, 2000 11:00 AM-12:00 PM |
| Location: | Hall G-J |
| Keywords: | BASAL GANGLIA, PUTAMEN, MOTOR MEMORY, MUTUAL INFORMATION |
In order to assess the role of striatal neurons in sequential movement, we applied mutual information analysis of single neuron activity of the primate putamen, reported in (Ueda and Kimura, Abst. of SfN 1999,765.17). In each trial, monkeys (macaca fuscata) first (Ins-task) turned a lever either to the right or to the left from a control hold position, then turned the lever or pressed a button in the opposite side under visual guidance. Subsequently (Rem-task) the same sequence of movement was performed without visual guidance but with auditory timing cues. We performed mutual information analysis (Sugase et.al. 1999) on 90 putamen neurons. The information about the first movement direction, left-right (LR) information, during 200ms before and 100ms after the lever movement completion was 8.1 bit in Ins-task and 5.9 bit in Rem-task (sum over neurons with significant information). The LR-information during 200-400ms before the first cue was 1.8 bit in Rem-task, while it was insignificant in Ins-task. The LR-information during 200-400ms before second cue was 2.5 bit in Ins-task and 2.3 bit in Rem-task. The information about the type of the second movement, lever-button(LB) information, during 200-400ms before the second cue was 1.4 bit in Rem-task, while it was insignificant in Ins-task. This result showed that the putamen neurons encode not only the present movement but also the next movement in memory guided movements. Based on the result, we propose a model in which striatal neurons represent the relative merits of candidate actions.
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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