Abstract
Stimulus discrimination gradients were compared for conditions in which intervening (test) stimuli were spaced equally between the positive (S+) and negative (S−) stimuli and when test stimuli were spaced unequally between S+ and S−. When the gradients are plotted as a function of the physical units of the stimulus dimension, no differences attributable to stimulus spacing are evident. The results further suggested that the Ss responded to intervening stimuli according to their arrangement on an interval scale rather than to their arrangement on an ordinal scale.
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