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Conference Paper: Accuracy of walking direction with and without visual feedback
Title | Accuracy of walking direction with and without visual feedback |
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Authors | |
Keywords | Medical sciences Ophthalmology and optometry |
Issue Date | 2013 |
Publisher | Association for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/ |
Citation | The 13th Annual Meeting of the Vision Sciences Society (VSS 2013), Naples, FL., 10-15 May 2013. In Journal of Vision, 2013, v. 13 n. 9, article 953 How to Cite? |
Abstract | Direction of self-motion during walking is indicated by multiple cues, including optic flow, non-visual sensory cues, and motor prediction. I measured the variability in walking direction with and without visual feedback, and tested whether visual and non-visual cues are weighted in an optimal manner. Open-loop walking in an immersive virtual environment was used to assess the accuracy of perceived walking direction. Observers walked toward a target 4m away either with no vision, or vision during the first 1m of walking. Three simulated environments were tested: target-only, target and textured ground, or target with textured ground and scattered posts. With no vision, variability in walking direction averaged 3°. Visual feedback during initial movement reduced variability to about 1.5°, regardless of visual environment. These results show that observers are capable of initiating movement toward a target with reasonable accuracy, but that even a limited amount of visual feedback significantly improves accuracy. Based on these measures, an optimal estimator would strongly weigh visual information. A second experiment measured the perceptual weighting of visual and non-visual cues. Optic flow specified a conflicting heading direction (±5°), and bias in walking direction was used to infer cue weights. Visual heading had a significant effect on walking direction, but the estimated visual weights were smaller than predicted (33-43% vs. 71%), and varied depending on the visual environment. Non-visual information appeared to have more influence than expected given the relative reliability of cues. |
Description | Poster Session - Perception and action: Locomotion, navigation: no. 53.308 This journal issue entitled: Vision Sciences Society Meeting, 2013: Abstracts Open Access Journal |
Persistent Identifier | http://hdl.handle.net/10722/198218 |
ISSN | 2023 Impact Factor: 2.0 2023 SCImago Journal Rankings: 0.849 |
DC Field | Value | Language |
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dc.contributor.author | Saunders, J | en_US |
dc.date.accessioned | 2014-06-25T02:55:40Z | - |
dc.date.available | 2014-06-25T02:55:40Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.citation | The 13th Annual Meeting of the Vision Sciences Society (VSS 2013), Naples, FL., 10-15 May 2013. In Journal of Vision, 2013, v. 13 n. 9, article 953 | en_US |
dc.identifier.issn | 1534-7362 | - |
dc.identifier.uri | http://hdl.handle.net/10722/198218 | - |
dc.description | Poster Session - Perception and action: Locomotion, navigation: no. 53.308 | - |
dc.description | This journal issue entitled: Vision Sciences Society Meeting, 2013: Abstracts | - |
dc.description | Open Access Journal | - |
dc.description.abstract | Direction of self-motion during walking is indicated by multiple cues, including optic flow, non-visual sensory cues, and motor prediction. I measured the variability in walking direction with and without visual feedback, and tested whether visual and non-visual cues are weighted in an optimal manner. Open-loop walking in an immersive virtual environment was used to assess the accuracy of perceived walking direction. Observers walked toward a target 4m away either with no vision, or vision during the first 1m of walking. Three simulated environments were tested: target-only, target and textured ground, or target with textured ground and scattered posts. With no vision, variability in walking direction averaged 3°. Visual feedback during initial movement reduced variability to about 1.5°, regardless of visual environment. These results show that observers are capable of initiating movement toward a target with reasonable accuracy, but that even a limited amount of visual feedback significantly improves accuracy. Based on these measures, an optimal estimator would strongly weigh visual information. A second experiment measured the perceptual weighting of visual and non-visual cues. Optic flow specified a conflicting heading direction (±5°), and bias in walking direction was used to infer cue weights. Visual heading had a significant effect on walking direction, but the estimated visual weights were smaller than predicted (33-43% vs. 71%), and varied depending on the visual environment. Non-visual information appeared to have more influence than expected given the relative reliability of cues. | en_US |
dc.language | eng | en_US |
dc.publisher | Association for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/ | - |
dc.relation.ispartof | Journal of Vision | en_US |
dc.subject | Medical sciences | - |
dc.subject | Ophthalmology and optometry | - |
dc.title | Accuracy of walking direction with and without visual feedback | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Saunders, J: jsaun@hku.hk | en_US |
dc.identifier.authority | Saunders, J=rp00638 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1167/13.9.953 | - |
dc.identifier.hkuros | 229480 | en_US |
dc.identifier.hkuros | 229483 | - |
dc.identifier.volume | 13 | - |
dc.identifier.issue | 9 | - |
dc.publisher.place | United States | - |
dc.customcontrol.immutable | sml 141212 | - |
dc.identifier.issnl | 1534-7362 | - |