The magnitude of the split-interval illusion was measured by the method of constant stimuli, with variable intervals between 700 and 1300 msec, and a 1000-msec. standard. All intervals were bounded by 20-msec.—1-kHz pulses and contained a single 20-msec.—2-kHz pulse which either split the interval in a 25:75 ratio or a 75:25 ratio. Intervals split early were overestimated relative to equivalent intervals split late by an average of 8.4% of the 1000-msec. standard.
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