Averaging of motor movements: Tests of an additive model.

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Abstract
Required 24 undergraduates to make several successive blind linear movements of controlled length and an additional uncontrolled blind linear movement to represent the average of the several fixed movements (stimuli). Support was found for a class of additive models. With 2 movements to be averaged, the responses could be approximated by a simple average of the stimulus scale values, where the subjective scale values of the longer fixed movements were estimated to be less than the objective lengths. In a 2nd experiment with 24 undergraduates involving conditions with 3 or 5 stimuli, the averaging responses could be approximated by a weighted average of the stimulus scale values, where the weight or influence of the last fixed movement was estimated to be slightly greater than the weights of the earlier fixed movements. Results are discussed in terms of the relationship between retention and serial integration processes. (17 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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