Stimulus generalization as a function of the number and range of generalization test stimuli.

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Abstract
Five groups of 20 human Ss each were exposed to a monochromatic light of 550 m[mu] (yellowish-green) under instructions to remember it, and were subsequently presented with a random sequence of stimuli under instructions to respond (finger lift from a telegraph key) only to the original value. The groups differed with regard to the number (and range) of generalization test stimuli, varying from 3 stimuli covering 20 m[mu] to 11 stimuli covering 100 m[mu]. Although the gradient of the 3 stimulus group was symmetrical, increasing the number and range of stimuli employed in the test produced a progressive asymmetry in the resulting gradients with proportionately greater responding to shorter and shorter wavelengths ("greener" colors). These data were interpreted as consistent with a verbal-mediation hypothesis.

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