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Ss learned serial lists composed of random orders of 24 letters of the English alphabet. The main independent variable was stimulus grouping, where the letters were presented either 1, 3, 4, 6, or 8 letters at a time. After reaching the criterion of 1 perfect recitation, Ss were required to recite the serial list backward. Time intervals between the letters during the criterion and backward recitations were analyzed to show the induced chunking produced by the stimulus grouping.

Control systems utilizing visual displays require rapid, error-free responses on the part of the operator for optimum use. The responses depend on the detection of differences in the stimulus objects of the display. The present investigation provides information relative to the nature of the changes in proficiency of performance of discriminative responses to visual stimuli that vary in location, size, or intensity.Since visual displays usually incorporate more than one dimension of variation in them so that as much information as possible can be presented in a single unit, a related problem is the determination of the effects of added dimensions on discriminations in a first dimension. A second purpose of this study is to present a method of scaling stimuli in terms of a complexity criterion and show how proficiency of performance of the discrimination task varies as a function

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