Motor concomitants of the association reaction.

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Abstract
The experiment followed Luria's technique of having the subject press a pneumatic key at the same time he gave a verbal response. This key records continuously the pressure exerted by the hand. More exhaustive quantitative and qualitative analysis of the records was attempted in an experiment which was otherwise conventional, involving the determination of which of two boxes a subject had inspected. Subjects differed in the typical patterns traced by the recorder from the key. Most of these normal patterns fell into five types. Significant disturbances or deviations from the normal pattern for a given subject were noted. Quantitatively the most diagnostic feature was the time by which the manual response preceded the verbal, although it was supposed to be synchronous. The standard deviation of these times was likewise of some diagnostic value. The qualitative variations comprised 18 which were of sufficient frequency to be useful in subsequent analysis. A double response in which the subject presses prematurely and then presses again was of considerable value. Other variations which are most frequently significant are the rebound after pressing the key with either a sudden or gradual return to initial level and the omission of the manual response altogether. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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