JN Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Neurophysiol 41: 542-556, 1978;
0022-3077/78 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Bizzi, E.
Right arrow Articles by Polit, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bizzi, E.
Right arrow Articles by Polit, A.

Journal of Neurophysiology, Vol 41, Issue 3 542-556, Copyright © 1978 by APS

ARTICLES

Effect of load disturbances during centrally initiated movements

E. Bizzi, P. Dev, P. Morasso and A. Polit

1. We have investigated the relative contributions of mechanical and reflex mechanisms in generating the forces produced by the neck muscles when loads were unexpectedly applied during centrally programmed head movements in monkeys. These movements, subserved by muscles well endowed with muscle spindles, are part of the coordinated eye-head response to the appearance of a stimulus in the animal's visual field. Our preparation was a chronically vestibulectomized monkey trained to make a visual discrimination. 2. Two procedures were used to evaluate the torque generated by the neck musculature when an unexpected load disturbance was applied: first, by surgically interrupting the afferent loop subserving the reflex action (section of cervical dorsal roots) and second, by building a mathematical model of the head-neck system and carrying out a process of simulation. 3. Our results indicated that the compensatory torque of reflex origin stimulated by the application of an opposing force was less than 10--30% of that required for perfect compensation, and the larger fraction of the observed compensation was due to the mechanical properties (inertial, viscous, and elastic) of the neck musculature. The combined action of reflex and mechanical processes never completely compensated for the disturbance.


This article has been cited by other articles:


Home page
 J. Neurophysiol.Home page
J. S. Reynolds, D. Blum, and G. T. Gdowski
Reweighting Sensory Signals to Maintain Head Stability: Adaptive Properties of the Cervicocollic Reflex
J Neurophysiol, June 1, 2008; 99(6): 3123 - 3135.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
R. L. Sainburg and S. Y. Schaefer
Interlimb Differences in Control of Movement Extent
J Neurophysiol, September 1, 2004; 92(3): 1374 - 1383.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
D. C. Dunbar, G. L. Badam, B. Hallgrimsson, and S. Vieilledent
Stabilization and mobility of the head and trunk in wild monkeys during terrestrial and flat-surface walks and gallops
J. Exp. Biol., February 22, 2004; 207(6): 1027 - 1042.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
E. A. Keshner
Head-Trunk Coordination During Linear Anterior-Posterior Translations
J Neurophysiol, April 1, 2003; 89(4): 1891 - 1901.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
F. C. Popescu and W. Z. Rymer
End Points of Planar Reaching Movements Are Disrupted by Small Force Pulses: An Evaluation of the Hypothesis of Equifinality
J Neurophysiol, November 1, 2000; 84(5): 2670 - 2679.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online