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dc.contributor.authorHine, Trevor
dc.contributor.authorWhite, Amanda
dc.date.accessioned2019-01-02T23:50:14Z
dc.date.available2019-01-02T23:50:14Z
dc.date.issued2010
dc.date.modified2012-02-10T03:54:59Z
dc.identifier.doi10.1167/10.7.883
dc.identifier.urihttp://hdl.handle.net/10072/41788
dc.description.abstractWhen observers are required to make judgments of the number of rapidly presented flashes of light, there is a tendency to either overestimate the count (‘flash fission’) or underestimate the count (‘flash fusion’), depending on the duration of the inter-flash interval (Bowen, 1989). Similarly, pairing the flashes with more or less loud, rapid beeps also results in fission and fusion effects (the sound-induced flash illusion, Andersen, Tiippana, & Sams, 2004; Shams, Kamitani, & Shimojo, 2000, 2002). Our aims were to determine how much these sound induced effects are dependent upon timings between clicks and flashes, and how these critical timings relate to the audiovisual ‘window of integration’ of around 100msec. A high contrast, 2° disc was flashed (11.7 ms, 7° periphery) in the presence of 0, 1, 2, or 3 beeps (7 ms, ∼ 75dbA, 3.5 kHz) with various audiovisual relative timings between 12 and 300 msec. Results from naïve observers demonstrate flash fusion when >100 ms separated all stimuli, whereas flash fission was reported for separation <50 ms, with the transition from fission to fusion occurring rapidly. These results were replicated in stepped-on, ramped-off or ramped-on, stepped off discs. Large and consistent fission effects occurred when the sounds were presented: 1. during the ramp and 2. within 100 ms of the transient. A control experiment showed that no consistent illusory rapid change was induced by the beeps in a disc smoothly ramping on and off. We propose that the fission effects are occurring as the result of an intersensory process, whilst the fusion effect are occurring as the result of response bias.
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAssociation for Research in Vision and Ophthalmology (ARVO)
dc.publisher.urihttps://www.visionsciences.org/past-meetings/
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofconferencenameVision Sciences Society 10th Annual Meeting
dc.relation.ispartofconferencetitleVision Science Society Abstracts
dc.relation.ispartofdatefrom2010-05-07
dc.relation.ispartofdateto2010-05-12
dc.relation.ispartoflocationNaples, Florida, U.S.A.
dc.rights.retentionY
dc.subject.fieldofresearchPsychology and Cognitive Sciences not elsewhere classified
dc.subject.fieldofresearchMedical and Health Sciences
dc.subject.fieldofresearchPsychology and Cognitive Sciences
dc.subject.fieldofresearchcode179999
dc.subject.fieldofresearchcode11
dc.subject.fieldofresearchcode17
dc.titleAudiovisual relative timings determine sound-induced flash fission versus flash fusion effects
dc.typeConference output
dc.type.descriptionE3 - Conferences (Extract Paper)
dc.type.codeE - Conference Publications
gro.facultyGriffith Health, School of Applied Psychology
gro.date.issued2010
gro.hasfulltextNo Full Text
gro.griffith.authorHine, Trevor J.
gro.griffith.authorWhite, Amanda MV.


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