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California State University, Long Beach
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Nasrin Zamiri, MA

PSYCHOLOGY MASTER’S THESIS ABSTRACT
Industrial/Organizational
December 1993

Effect of Stimulus Duration, ISOI, and Number of Sound Sources on Auditory Apparent Motion

The present study revealed the effects of three speakers versus two speakers on the illusion of auditory apparent motion. Listener perception was analyzed across ISOI, stimulus duration, and the number of speakers. Subjects were instructed to categorize their perception of the stimulus into one of five categories. Results indicated that when using two speakers, subjects reported continuous motion at least 50% of the time at the stimulus durations of 25 msec and 50 msec. However, when a third speaker was added, the 10 msec stimulus duration was included as a minimum stimulus duration for continuous motion detection. Regarding ISOIs and the number of speakers, results indicated a significant interaction but not in the direction hypothesized. The three-speaker distribution peak was higher than the two-speaker distribution peak, implying higher mean percentage of continuous motion responses, but not at smaller values of ISOIs.

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