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The Relationship Between Illusory Crescents and the Stream/Bounce Effect.

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Illusory crescents do not explain the audiovisual stream/bounce effect. This study found that target speed and sound influence illusory crescent size and perceived motion differently, refuting a key hypothesis.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Auditory Perception

Background:

  • The audiovisual stream/bounce effect describes how observers perceive object motion based on visual and auditory cues.
  • Meyerhoff and Scholl (2018) hypothesized that illusory crescents contribute to the stream/bounce effect resolution.

Purpose of the Study:

  • To test Meyerhoff and Scholl's hypothesis regarding the role of illusory crescents in audiovisual stream/bounce displays.
  • To investigate the influence of target speed, overlap, and sound on illusory crescent perception and reported motion.

Main Methods:

  • Two experiments were conducted, measuring illusory crescent size (Experiment 1) and stream/bounce responses (Experiment 2).
  • Stimuli varied in target speed (∼5 to ∼38 degrees/s), overlap, and sound presence.
  • Target speeds spanned typical ranges and those used by Meyerhoff and Scholl.

Main Results:

  • Meyerhoff and Scholl's findings were replicated at higher speeds but not at slower speeds.
  • Target speed influenced illusory crescent size and bounce responses in opposite directions: crescent size increased with speed, while bounce responses decreased.
  • Sound enhanced bounce responses across all speeds but did not consistently increase illusory crescent size at slower speeds.

Conclusions:

  • The dissociation between the effects of speed and sound on illusory crescents and reported motion contradicts Meyerhoff and Scholl's hypothesis.
  • Illusory crescents do not account for the observed patterns in the audiovisual stream/bounce effect.
  • The findings suggest alternative explanations for the stream/bounce effect beyond illusory crescents.