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Conference Paper: Effects of discrepant optic flow during walking on the perceived visual and proprioceptive straight ahead in egocentric space

TitleEffects of discrepant optic flow during walking on the perceived visual and proprioceptive straight ahead in egocentric space
Authors
Issue Date2014
PublisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/
Citation
The 14th Annual Meeting of the Vision Sciences Society (VSS 2014), St. Pete Beach, FL., 16-21 May 2014. In Journal of Vision, 2014, v. 14 n. 10, article no. 1341 How to Cite?
AbstractPrevious research has shown that discrepant optic flow experienced during walking with prism glasses can shift both the visual and proprioceptive straight ahead (SA) in egocentric space. Here by having participants walk in an immersive virtual environment, we examined how adding optic flow information in the scene affected such shifts and whether such shifts increased with prolonged exposure to discrepant optic flow. Nineteen participants wore a head-mounted display (44°Hx34°V) and walked toward a red post target placed on a textured ground or a doorway on the back wall of a room. The target and the doorway were both at 8 m. The room display provided denser flow and motion parallax information than did the textured ground display. Participants’ visual heading specified by optic flow was displaced by ±10° from their physical walking direction, causing discrepant optic flow. We measured participants’ VSA and PSA before walking, after 10 trials, 20 trials, and 30 trials of walking, respectively. For VSA measurement, the experimenter moved a light spot on a wall and participants judged when it was at their SA. For the PSA measurement, participants were blindfolded and used a laser pointer to point at their SA. We found a significant shift in PSA for both the room and the textured ground displays. The shift in PSA was larger than that in VSA for both displays, and the shift in VSA was significant for the room (about 2°) but not the textured ground display. The shifts in both PSA and VSA increased with the number of trials tested for the room but not the textured ground display. We conclude that discrepant optic flow during walking recalibrates PSA in egocentric space more than VSA, and this recalibration increases with the exposure to discrepant optic flow when the display contains rich optic flow information.
DescriptionPoster session: Perception and action: Locomotion, wayfinding, space
Persistent Identifierhttp://hdl.handle.net/10722/201413
ISSN
2015 Impact Factor: 2.341
2015 SCImago Journal Rankings: 1.042

 

DC FieldValueLanguage
dc.contributor.authorChen, Jen_US
dc.contributor.authorHe, Ken_US
dc.contributor.authorWei, KLen_US
dc.contributor.authorLi, Len_US
dc.date.accessioned2014-08-21T07:27:00Z-
dc.date.available2014-08-21T07:27:00Z-
dc.date.issued2014en_US
dc.identifier.citationThe 14th Annual Meeting of the Vision Sciences Society (VSS 2014), St. Pete Beach, FL., 16-21 May 2014. In Journal of Vision, 2014, v. 14 n. 10, article no. 1341en_US
dc.identifier.issn1534-7362en_US
dc.identifier.urihttp://hdl.handle.net/10722/201413-
dc.descriptionPoster session: Perception and action: Locomotion, wayfinding, spaceen_US
dc.description.abstractPrevious research has shown that discrepant optic flow experienced during walking with prism glasses can shift both the visual and proprioceptive straight ahead (SA) in egocentric space. Here by having participants walk in an immersive virtual environment, we examined how adding optic flow information in the scene affected such shifts and whether such shifts increased with prolonged exposure to discrepant optic flow. Nineteen participants wore a head-mounted display (44°Hx34°V) and walked toward a red post target placed on a textured ground or a doorway on the back wall of a room. The target and the doorway were both at 8 m. The room display provided denser flow and motion parallax information than did the textured ground display. Participants’ visual heading specified by optic flow was displaced by ±10° from their physical walking direction, causing discrepant optic flow. We measured participants’ VSA and PSA before walking, after 10 trials, 20 trials, and 30 trials of walking, respectively. For VSA measurement, the experimenter moved a light spot on a wall and participants judged when it was at their SA. For the PSA measurement, participants were blindfolded and used a laser pointer to point at their SA. We found a significant shift in PSA for both the room and the textured ground displays. The shift in PSA was larger than that in VSA for both displays, and the shift in VSA was significant for the room (about 2°) but not the textured ground display. The shifts in both PSA and VSA increased with the number of trials tested for the room but not the textured ground display. We conclude that discrepant optic flow during walking recalibrates PSA in egocentric space more than VSA, and this recalibration increases with the exposure to discrepant optic flow when the display contains rich optic flow information.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.titleEffects of discrepant optic flow during walking on the perceived visual and proprioceptive straight ahead in egocentric spaceen_US
dc.typeConference_Paperen_US
dc.identifier.emailChen, J: jing0504@hku.hken_US
dc.identifier.emailLi, L: lili@hku.hken_US
dc.identifier.authorityLi, L=rp00636en_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1167/14.10.1341-
dc.identifier.hkuros232305en_US
dc.identifier.volume14-
dc.identifier.issue10-
dc.publisher.placeUnited Statesen_US

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