Skip to Local Navigation
Skip to Content
California State University, Long Beach
Print this pageAdd this page to your favoritesSelect a font sizeSelect a small fontSelect a medium fontSelect a large font

April Witty

May 1994

The Effects of Duration, Interstimulus Onset Interval (ISOI) and Separation on Perceived Velocity in Auditory Apparent Motion


    Auditory apparent motion is an illusion produced by the proper timing and placement of two discrete stimuli; under optimal conditions movement of the lead stimulus toward the lag stimulus is perceived.  This study investigated the effect of duration, ISOI and separation on subjects’ ability to perceive velocity in auditory apparent motion.  Eight subjects were exposed to 80 unique duration, ISOI and separation combinations and were asked to make velocity estimations.  All hypotheses were supported; as duration and ISOI increased, velocity estimations decreased and as separation increased, velocity estimations increased.

    Subjects were asked to make duration and separation estimations after they completed the velocity estimation task to make sure they were not judging duration or separation and interpreting it as velocity.  The results from the duration and separation estimation tasks did not parallel the results from the velocity estimation task.  The results suggest that temporal factors (stimulus duration and ISOI) have a greater influence than spatial factors on subjects’ perceived velocity judgments.

    Upcoming Events

    • No events.

    Contact Information

    Psychology Department

    PSY 100
    1250 Bellflower Boulevard
    Long Beach, California 90840

    Front Office: 562-985-5001

    Department Office Hours:
    Monday - Thursday: 7:30 am - 5:00 pm
    Friday: 8:00 am - 3:00 pm
    Closed noon to 1:00 pm for lunch

    General Inquiries:
    Contact us

    Faculty Office Hours