Reaction time as related to tensions in muscles not essential in the reaction.

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Abstract
25 Ss participated in approximately 14 practice sessions, each consisting of 100 reactions of pressing a telegraph key as quickly as possible after a light went on. Reaction times were recorded for each reaction, while action potentials in the calf of the right leg were recorded during only 6 trials in each session. At the beginning of each session S was told his average reaction time for the previous day and shown a chart of the group's performance. It was concluded that under these conditions, (1) practice may give rise to either positive or negative increments in the action potential which vary greatly in magnitude. (2) Improvement in reaction time may be associated with either increase or decrease in action potential. (3) The influence of stimulus intensity, set, and incentive, which were only partially controlled in this situation, need investigation. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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