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Previous studies have shown a consistent intersensory difference in absolute judgments of the duration of continuous auditory and visual inputs. More visual than auditory clock time was judged equivalent to specific temporal concepts. Two experiments investigated this intersensory phenomenon further by comparing the judgments of filled auditory and visual durations with the estimation of unfilled intervals bounded by discrete lights and sounds. Auditory durations were judged longer than visual for the filled and unfilled conditions, and filled auditory durations were judged longer than unfilled auditory intervals The intersensory difference in time judgment was independent of stimulus pattern while the filled-unfilled difference was dependent upon sense mode, order effects and internal temporal standard. Stimulus properties must be cons~dered when interpreting the results of time judgment research.

Sense mode ( 1 ), anchors ( 2 ) , and psychophysical method ( 3 ) influence time judgment. This experiment explores the possibiliry that temporal estimates of filled and unfilled durations would differ; the presence or absence of stimulation during the interval may be a relevant factor in time judgment.Two groups of 27 Ss each were presented an ascending and descending series of both filled durations of light and unfilled durations bounded by light flashes with order counterbalanced. The light source was a small red neon glow tube of comfortable brightness. Each filled and unfilled duration was judged by S as more or less than his concept of one clock second. A filled and unfilled Second Estimation Point (SEP) was derived from these judgments ( 2 ) .Since no order effects were found, the two groups were combined and filled and unfilled SEPs were compared with the Wilcoxon matched pairs rest.Filled durations (Mdn SEP, .81 sec.) were judged significantly longer (P < ,001) than unfilled durations (Mdn SEP, 1.00 sec.). More unfilled clock time was judged equivalent to the same temporal concept than filled clock rime, reflecting greater relative overestimation of the filled input.It is clear chat there are differences in apparent duration dependent upon whether S judges time that involves the presence or absence of stimulation. This finding should be investigated further using other sense modes, ranges of durations, and psychophysical methods.

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