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The Head-Neck Sensory Motor System$
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Alain Berthoz, Werner Graf, and P. P. Vidal

Print publication date: 1992

Print ISBN-13: 9780195068207

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195068207.001.0001

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Abnormal Timing of Antagonist Splenius Burst in Head Movements of Patients with Cerebellar Disorders: Clinical and Modeling Results

Abnormal Timing of Antagonist Splenius Burst in Head Movements of Patients with Cerebellar Disorders: Clinical and Modeling Results

Chapter:
(p.678) Chapter 114 Abnormal Timing of Antagonist Splenius Burst in Head Movements of Patients with Cerebellar Disorders: Clinical and Modeling Results
Source:
The Head-Neck Sensory Motor System
Author(s):

Wolfgang H. Zangemeister

Jürgen Dee

Andreas C. Arlt

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0114

The objective of this study is to understand the role of the cerebellum with respect to the generating process and timing of the motor control signals. The model for simulation of head movements involves the approximation of a rigid sphere, rotating about its center of mass. The experimental setup involves the test subject sitting in front of a screen that is horizontally concave. The patient is asked to make time-optimal head movements of 80° amplitude. Experimental results for normal subjects and patients with cerebellar disorders are presented. The chapter discusses how increased fluctuations of premotor and reciprocal motor activation is responsible for cerebellar dysmetria.

Keywords:   cerebellar dysmetria, cerebellar disorders, cerebellum, reciprocal motor activation, head movements, control signals

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