Abstract
Three experiments address the cause of the different performance levels-found in time discrimination of empty intervals with durations near 250 msec. Performance differed according to the kind of sensory modality that marked the intervals. With a procedure in which the type of marker was randomized from trial to trial, it was shown that variability of discrimination judgments could not be attributed entirely to the variability of the criterion on which-a judgment was based. Such a randomization slightly affects discrimination but provokes a reorganization related to marker conditions of the probabilities of judging an interval to be short or long. Moreover, it was shown that within intramodal conditions, physical characteristics of markers influence the discrimination performances. To account for the results generated with different marker-type intervals at 250 msec, we propose that two types of processor may be involved in duration discrimination: one is specifically related to a given sensory modality, whereas the other is aspecific and responsible for discrimination of intermodal intervals.
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This research was supported by a grant to S. Grondin from Laurentian University Research Fund provided by the Natural Sciences and Engineering Research Council of Canada; and by Grant A0692 from NSERC to R. Rousseau.
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Grondin, S., Rousseau, R. Judging the relative duration of multimodal short empty time intervals. Perception & Psychophysics 49, 245–256 (1991). https://doi.org/10.3758/BF03214309
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DOI: https://doi.org/10.3758/BF03214309