a.1.(Physiol.) Applied to those actions, or muscular movements, which are automatic expressions of dominant ideas, rather than the result of distinct volitional efforts, as the act of expressing the thoughts in speech, or in writing, while the mind is occupied in the composition of the sentence.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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For Carpenter, hypnotic phenomena were due to the mind being fully occupied by operator-suggested ideas, and were generated by means of an "ideo-motor principle of action" (1852, p.
To reconcile the hypnotic phenomena "with the known laws of nervous action" and, without elaborating on mechanism (hypothesis non fingo!), Carpenter offered a metaphorical "ideo-motor principle of action" to explain "the whole class of purely emotional movements [that] depend upon the excitation of certain states of mind by external impressions" (Carpenter, 1852, p.
The mechanism of suggestion in general, may then be summed up in the following formula: increase of the reflex ideo-motor, ideo-sensitive, and ideo-sensorial excitability ...