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Article: Reliability and relative weighting of visual and nonvisual information for perceiving direction of self-motion during walking

TitleReliability and relative weighting of visual and nonvisual information for perceiving direction of self-motion during walking
Authors
Issue Date2014
PublisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/
Citation
Journal of Vision, 2014, v. 14 n. 3, article no. 24 How to Cite?
AbstractDirection of self-motion during walking is indicated by multiple cues, including optic flow, nonvisual sensory cues, and motor prediction. I measured the reliability of perceived heading from visual and nonvisual cues during walking, and whether cues are weighted in an optimal manner. I used a heading alignment task to measure perceived heading during walking. Observers walked toward a target in a virtual environment with and without global optic flow. The target was simulated to be infinitely far away, so that it did not provide direct feedback about direction of self-motion. Variability in heading direction was low even without optic flow, with average RMS error of 2.4°. Global optic flow reduced variability to 1.9°–2.1°, depending on the structure of the environment. The small amount of variance reduction was consistent with optimal use of visual information. The relative contribution of visual and nonvisual information was also measured using cue conflict conditions. Optic flow specified a conflicting heading direction (±5°), and bias in walking direction was used to infer relative weighting. Visual feedback influenced heading direction by 16%–34% depending on scene structure, with more effect with dense motion parallax. The weighting of visual feedback was close to the predictions of an optimal integration model given the observed variability measures.
Persistent Identifierhttp://hdl.handle.net/10722/197890
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSaunders, JAen_US
dc.date.accessioned2014-06-02T15:23:26Z-
dc.date.available2014-06-02T15:23:26Z-
dc.date.issued2014en_US
dc.identifier.citationJournal of Vision, 2014, v. 14 n. 3, article no. 24en_US
dc.identifier.urihttp://hdl.handle.net/10722/197890-
dc.description.abstractDirection of self-motion during walking is indicated by multiple cues, including optic flow, nonvisual sensory cues, and motor prediction. I measured the reliability of perceived heading from visual and nonvisual cues during walking, and whether cues are weighted in an optimal manner. I used a heading alignment task to measure perceived heading during walking. Observers walked toward a target in a virtual environment with and without global optic flow. The target was simulated to be infinitely far away, so that it did not provide direct feedback about direction of self-motion. Variability in heading direction was low even without optic flow, with average RMS error of 2.4°. Global optic flow reduced variability to 1.9°–2.1°, depending on the structure of the environment. The small amount of variance reduction was consistent with optimal use of visual information. The relative contribution of visual and nonvisual information was also measured using cue conflict conditions. Optic flow specified a conflicting heading direction (±5°), and bias in walking direction was used to infer relative weighting. Visual feedback influenced heading direction by 16%–34% depending on scene structure, with more effect with dense motion parallax. The weighting of visual feedback was close to the predictions of an optimal integration model given the observed variability measures.en_US
dc.languageengen_US
dc.publisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/en_US
dc.relation.ispartofJournal of Visionen_US
dc.titleReliability and relative weighting of visual and nonvisual information for perceiving direction of self-motion during walkingen_US
dc.typeArticleen_US
dc.identifier.emailSaunders, JA: jsaun@hku.hken_US
dc.identifier.authoritySaunders, JA=rp00638en_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1167/14.3.24en_US
dc.identifier.pmid24648194-
dc.identifier.pmcidPMC3969026-
dc.identifier.hkuros229123en_US
dc.identifier.volume14en_US
dc.identifier.issue3en_US
dc.identifier.spagearticle no. 24-
dc.identifier.epagearticle no. 24-
dc.identifier.isiWOS:000334344500023-

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