The relative unimportance of the temporal pattern of the primary afferent input in determining the mean level of motor firing in the tonic vibration reflex.

The Journal of Physiology
P B Matthews

Abstract

1. A study has been made of the effect of varying the temporal arrangement of the mechanical stimuli used to elicit the tonic vibration reflex in the soleus muscle of the decerebrate cat. The reflex was elicited by brief mechanical pulses, applied repetitively, either as a regular series or, at the same mean frequency, in groups of 2, 3 or 4 pulses with a separation between the pulses of 3-5 msec. Mean frequencies of 140/sec and 100/sec were used. The amplitude of the pulses was such that it could be presumed that each pulse excited every Ia fibre from soleus to discharge a spike, irrespective of the patterning employed. 2. Alterations in the stimulus pattern produced only minimal alterations in the size of the resultant reflex recorded myographically. The grouped stimulation regularly tended to produce the larger effect, but even with groups of 4 at 100/sec the modal effect was only 10% of the pre-existing response; expressed another way this was equivalent to an increase of 11 Hz in the mean frequency of stimulation. Thus under these conditions grouping the stimuli cannot have had an appreciable effect either in increasing the firing frequency of those motoneurones which were already active, or in recruiting those which were ...Continue Reading

Citations

Nov 6, 2004·The International Journal of Neuroscience·Koichi Hiraoka
Jan 1, 1982·Archives of Oral Biology·Y Yamada, M M Ash
Aug 1, 1976·Journal of Neurology, Neurosurgery, and Psychiatry·K E HagbarthL Löfstedt
Apr 1, 1986·Journal of Neurology, Neurosurgery, and Psychiatry·G Cruccu, D Bowsher
Nov 19, 2011·Journal of Applied Physiology·Ross D PollockDi J Newham
Jan 1, 1985·Biological cybernetics·R Eckhorn, H Querfurth

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