ISSN:
1432-0770
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Computer Science
,
Physics
Notes:
Abstract The relationship between the movement's parameters and the motor output during the execution of certain intentional motor tasks subsequent to a ballistically initiated movement is determined. The two tasks considered are to arrest the movement and to accelerate it as fast as possible. These experiments are the same as described in the preceding paper (Viviani and Terzuolo, 1973). It is shown that the motor output is dependent on sensory input in normal subjects and that this dependence is absent in cerebellar patients. The phase relations between motor output and angular displacement in normal subjects indicate the likelihood of fusimotor dynamic activity to the muscle spindles when the task is to arrest the movement. Instead, when normal subjects are instructed to accelerate the movement, an appropriately timed fusimotor static activity, i.e. alpha-gamma linkage, is indicated. The appropriately timed switching of fusimotor static and dynamic activation is attributed to the presence of cerebellar activities.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00290292
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