Multidimensional stimulus differences and accuracy of discrimination.

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Abstract
The present study was concerned with the contribution of multidimensional stimulus differences to accuracy of discrimination. Discrimination accuracy was determined by the method of absolute judgment for a series of stimuli varying along the dimension of size, of hue, and of brightness. The discrimination measures obtained for these stimuli varying1 along these single dimensions were then compared with the discrimination measures obtained when a series of stimuli varied on size and hue, size and brightness, hue and brightness, and size, hue, and brightness. The results demonstrated that the discriminability for a multidimensional series of stimuli was considerably greater than that obtained for any of the compounding dimensions used alone. It was further shown that the discrimination accuracy for a compounded or multidimensional series of stimuli could be predicted with reasonable precision if the discrimination accuracy of the compounding dimensions was known. This predictability was based upon the assumption of independence in the accuracy with which magnitudes on 2 or more dimensions are simultaneously judged.
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