The Rate of Diadochocinetic Movement of the Jaw at the Ages from Seven to Maturity

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Abstract
This study was undertaken with the following assumptions: (1) The rate of simple alternating movements "can be taken as an indication of the speed of change from inhibition to stimulation of antagonistic sets of muscles"; (2) "the speed of change may be called the speed of the reciprocating synapses of the central nervous system"; and (3) tests of the maximum rate of movement of the jaw or other speech organs are a measure of the maximum rate "at which the reciprocating synapses of the central nervous system may function in speech." Analysis of jaw movement data from 613 subjects between the ages of 7 and 20 yrs. shows that the maximum rate increases with age up to the 17th year. The data are also analyzed for sex differences. "Stutterers seem to show a slower rate of diadochocinesis of the jaw than do non-stutterers.".

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