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Auditory transients do not affect visual sensitivity in discriminating between objective streaming and bouncing

Philip M Grove¹, Jessica Ashton, Yousuke Kawachi

¹School of Psychology, The University of Queensland, St. Lucia, Queensland, Australia. p.grove@psy.uq.edu.au

Journal of Vision

|August 9, 2012

Summary

This summary is machine-generated.

Sound illusions, like the stream/bounce effect, are influenced by decision-making, not perception. A study found that auditory cues shift response criteria, affecting how we interpret visual motion, demonstrating a decisional bias.

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Area of Science:

Visual perception
Auditory perception
Psychophysics
Cognitive psychology

Background:

The stream/bounce effect, a visual illusion where sound influences perceived motion, is typically measured through subjective reports.
Previous research has not clearly distinguished whether perceptual or decisional factors underlie this sound-induced bias.

Purpose of the Study:

To investigate the underlying mechanisms of the sound-induced bias in the stream/bounce effect.
To independently measure perceptual sensitivity and decision criteria using signal detection theory.

Main Methods:

Developed a novel visual stimulus where targets were made visually distinct using texture density.
Employed a signal detection paradigm to assess observers' sensitivity (d') and criterion (c) for discriminating streaming vs. bouncing events.
Compared performance in the presence and absence of a brief sound cue at the point of coincidence.

Main Results:

Sound-induced motion reversals persisted even when visual targets differed by up to nine just-noticeable-differences (JNDs).
No significant difference in sensitivity (d') was found between sound and no-sound conditions.
A significantly more liberal criterion (c) was observed in the sound condition compared to the no-sound condition.

Conclusions:

The auditory-induced bias toward bouncing in the stream/bounce effect is primarily due to a shift in decision criterion.
Decisional processes, rather than perceptual processes, are implicated in this auditory-influenced visual illusion.