The effect of delay upon the duplication of short temporal intervals.

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Abstract
The prime objective of this investigation was to determine the influence of varying delay intervals upon the duplication of short temporal intervals. The hardship of earlier investigators was overcome to some extent by the use of an apparatus called "Interval Timer," designed not only to control accurately stimulus durations, but also to enable the subjects to duplicate durations presented by E. This apparatus was designed by Dr. Philip of Fordham University and Messrs. Reintjes & Weil of Manhattan College. 7 stimulus durations ranging from 0.48 sec. to 16.2 sec., and 7 delay intervals ranging from 2.5 sec. to 30 sec. were used in this expt. The subjects were 30 high school students from whom 5,880 judgments were secured. It was found that stimulus dura tions of 0.48 and 0.92 sec. were consistently overestimated for all delay intervals, whereas stimulus durations of 1.9, 4.1, 6.25, 8.85 and 16.2 sec. were consistently underestimated. Analysis of variance indicated that stimulus durations, rather than delay intervals, are the significant factors in overestimations or underestimations of time duplications. Duplications averaged according to stimulus durations showed that as the stimulus duration increases, the % of estimation decreases. Finally, duplications averaged according to delay intervals, indicated a tendency to underestimate at all delay intervals.

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