Stimulus dispersions in the method of constant stimuli.

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Abstract
A method is developed for numerically evaluating the stimulus dispersions for stimuli that have been presented by the constant method. Description of the experimental data and two cases under which they may be treated are presented. A procedure is presented for obtaining the approximate value for the dispersion of each stimulus. A criterion for determining whether the simpler form of Case V or the more laborious Case III should be used for an experiment conducted by the constant method is given. The greater the deviation of the stimulus dispersion from the average dispersion, the greater will be the error caused by the principal assumption of Case V and the greater will be the discrepancies between experimental and calculated data. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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