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

Grove, Philip M., Ashton, Jessica, Kawachi, Yousuke and Sakurai, Kenzo (2012) Auditory transients do not affect visual sensitivity in discriminating between objective streaming and bouncing events. Journal of Vision, 12 8: 1-11. doi:10.1167/12.8.5


Author Grove, Philip M.
Ashton, Jessica
Kawachi, Yousuke
Sakurai, Kenzo
Title Auditory transients do not affect visual sensitivity in discriminating between objective streaming and bouncing events
Journal name Journal of Vision   Check publisher's open access policy
ISSN 1534-7362
Publication date 2012-08
Year available 2012
Sub-type Article (original research)
DOI 10.1167/12.8.5
Open Access Status DOI
Volume 12
Issue 8
Start page 1
End page 11
Total pages 11
Place of publication Rockville, MD, USA
Publisher Association for Research in Vision and Ophthalmology
Collection year 2013
Language eng
Formatted abstract
With few exceptions, the sound-induced bias toward bouncing characteristic of the stream/bounce effect has been demonstrated via subjective responses, leaving open the question whether perceptual factors, decisional factors, or some combination of the two underlie the illusion. We addressed this issue directly, using a novel stimulus and signal detection theory to independently characterize observers' sensitivity (d′) and criterion (c) when discriminating between objective streaming and bouncing events in the presence or absence of a brief sound at the point of coincidence. We first confirmed that sound-induced motion reversals persist despite rendering the targets visually distinguishable by differences in texture density. Sound-induced bouncing persisted for targets differing by as many as nine just-noticeable-differences (JNDs). We then exploited this finding in our signal detection paradigm in which observers discriminated between objective streaming and bouncing events. We failed to find any difference in sensitivity (d′) between sound and no-sound conditions, but we did observe a significantly more liberal criterion (c) in the sound condition than the no-sound condition. The results suggest that the auditory-induced bias toward bouncing in this context is attributable to a sound-induced shift in criterion implicating decisional processes rather than perceptual processes determining responses to these displays.
Keyword Motion perception
Stream/bounce
Random element patterns
Signal detection theory
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Psychology Publications
 
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Created: Fri, 12 Apr 2013, 12:04:28 EST by Mrs Alison Pike on behalf of School of Psychology