Control of a one-link arm by burst signal generators

The focus of this paper is the study of stability and point-to-point movement of a one-link arm. The sagittal arm has two musculotendon actuators, two neural oscillators that generate burst signals as motoneuron inputs, and spindles and Golgi tendon organs for extrinsic reflex feedbacks. It is shown...

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Bibliographic Details
Published in:Biological cybernetics 1995-06, Vol.73 (1), p.37-47
Main Authors: Kim, J, Hemami, H
Format: Article
Language:English
Subjects:
Biomechanical Phenomena
Biophysics - instrumentation
Feedback
Forearm - physiology
Humans
Isometric Contraction
Mechanoreceptors - physiology
Models, Biological
Models, Structural
Motor Neurons - physiology
Movement - physiology
Muscle Spindles - physiology
Muscle, Skeletal - physiology
Space life sciences
Tendons - physiology
Weight-Bearing
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Summary:The focus of this paper is the study of stability and point-to-point movement of a one-link arm. The sagittal arm has two musculotendon actuators, two neural oscillators that generate burst signals as motoneuron inputs, and spindles and Golgi tendon organs for extrinsic reflex feedbacks. It is shown that coactivation leads to intrinsic position and velocity feedback, and that the tendons introduce intrinsic force and rate of force feedback. In addition, the integrating effects of the tendons are studied when the actuator is constructed from a large number of identical fibers that are excited by alpha signals whose arrival times at the fiber are randomly distributed. Each of the musculotendon actuators receives two input signals--a burst signal analogous to alpha inputs and a conventional analogue signal that represents fusimotor input to the spindles. The process of combining burst signals and conventional analogue signals is studied. Simulation results show that the movement of the system with burst signals as inputs has overshoot and speed similar to the system with analogue signals.
ISSN:0340-1200
1432-0770
DOI:10.1007/BF00199054