Using S's previous response as his next stimulus in a time-interval reproduction task, response series were obtained from 22 individuals which tended toward limits independent of the initial intervals. The magnitudes of the intervals at these limits may, therefore, be properly called indifference intervals. 2 Ss gave responses which did not accord with this general finding. However, these results may be accounted for either as atypical response behaviour similar to that reported by other investigators or as erroneous responses due to a possible shortcoming of the method used. The actual cause remains to be found by further work.
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