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Conference Paper: Use of optic flow and visual direction in steering toward a target

TitleUse of optic flow and visual direction in steering toward a target
Authors
KeywordsMedical sciences
Ophthalmology and optometry
Issue Date2010
PublisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/
Citation
The 10th Annual Meeting of the Vision Sciences Society (VSS 2010), Naples, FL., 7-12 May 2010. In Journal of Vision, 2010, v. 10 n. 7, article 799 How to Cite?
AbstractPrevious studies have shown that humans use both optic flow and the target visual direction in active control of self-motion. Here we develop a methodology that allows a more sensitive measurement of the observer's separate reliance on these cues to steer toward a target. Three observers were asked to use a joystick to steer toward a target with three types of displays, an empty screen with only a target visible, a textured ground plane, and a textured ground with reference posts. To tease apart the observer's use of optic flow and target visual direction cues, we perturbed both heading (Yh) and the simulated gaze direction (Yg) in the display using independent sums of seven harmonically unrelated sinusoids (0.1-2.18 Hz and 0.11-2.21 Hz). The former shifted heading from the target while the latter kept heading intact but shifted the target visual direction on the screen. Observers had control of their heading but not their simulated gaze direction (i.e., Yh is a closed-loop task while Yg is an open-loop task). Ninety-second time series of heading error, gaze direction, and joystick displacement were Fourier analyzed and averaged across six trials. For all three observers, as displays contained more optic flow information, the heading RMS error decreased (mean error: 5.99°, 4.50°, and 4.33° for the empty, the textured ground, and the textured ground with posts displays respectively), and observers increasingly controlled heading compared to gaze disturbance (mean ratio of control power correlation: 0.82, 1.08, and 1.40, respectively). Furthermore, Bode plots (frequency response plots) revealed a significant decrease of sensitivity to gaze disturbance (mean control gain: 5.53, -1.03, and -3.76 dB respectively). These findings show that with enriched optic flow displays observers rely more on heading and less on visual direction to steer toward a target.
DescriptionPosters - Binocular vision: Stereopsis. 56.321
Persistent Identifierhttp://hdl.handle.net/10722/129935
ISSN
2015 Impact Factor: 2.341
2015 SCImago Journal Rankings: 1.042

 

DC FieldValueLanguage
dc.contributor.authorLi, Sen_US
dc.contributor.authorNiehorster, DCen_US
dc.contributor.authorLi, Len_US
dc.date.accessioned2010-12-23T08:44:33Z-
dc.date.available2010-12-23T08:44:33Z-
dc.date.issued2010en_US
dc.identifier.citationThe 10th Annual Meeting of the Vision Sciences Society (VSS 2010), Naples, FL., 7-12 May 2010. In Journal of Vision, 2010, v. 10 n. 7, article 799en_US
dc.identifier.issn1534-7362-
dc.identifier.urihttp://hdl.handle.net/10722/129935-
dc.descriptionPosters - Binocular vision: Stereopsis. 56.321-
dc.description.abstractPrevious studies have shown that humans use both optic flow and the target visual direction in active control of self-motion. Here we develop a methodology that allows a more sensitive measurement of the observer's separate reliance on these cues to steer toward a target. Three observers were asked to use a joystick to steer toward a target with three types of displays, an empty screen with only a target visible, a textured ground plane, and a textured ground with reference posts. To tease apart the observer's use of optic flow and target visual direction cues, we perturbed both heading (Yh) and the simulated gaze direction (Yg) in the display using independent sums of seven harmonically unrelated sinusoids (0.1-2.18 Hz and 0.11-2.21 Hz). The former shifted heading from the target while the latter kept heading intact but shifted the target visual direction on the screen. Observers had control of their heading but not their simulated gaze direction (i.e., Yh is a closed-loop task while Yg is an open-loop task). Ninety-second time series of heading error, gaze direction, and joystick displacement were Fourier analyzed and averaged across six trials. For all three observers, as displays contained more optic flow information, the heading RMS error decreased (mean error: 5.99°, 4.50°, and 4.33° for the empty, the textured ground, and the textured ground with posts displays respectively), and observers increasingly controlled heading compared to gaze disturbance (mean ratio of control power correlation: 0.82, 1.08, and 1.40, respectively). Furthermore, Bode plots (frequency response plots) revealed a significant decrease of sensitivity to gaze disturbance (mean control gain: 5.53, -1.03, and -3.76 dB respectively). These findings show that with enriched optic flow displays observers rely more on heading and less on visual direction to steer toward a target.-
dc.languageengen_US
dc.publisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/-
dc.relation.ispartofJournal of Vision-
dc.subjectMedical sciences-
dc.subjectOphthalmology and optometry-
dc.titleUse of optic flow and visual direction in steering toward a targeten_US
dc.typeConference_Paperen_US
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1534-7362&volume=10&issue=7, article 799&spage=&epage=&date=2010&atitle=Use+of+optic+flow+and+visual+direction+in+steering+toward+a+target-
dc.identifier.emailLi, S: sdli@cs.hku.hken_US
dc.identifier.emailNiehorster, DC: dcnieho@hku.hken_US
dc.identifier.emailLi, L: lili8816@gmail.comen_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1167/10.7.799-
dc.identifier.hkuros178379en_US
dc.identifier.volume10-
dc.identifier.issue7, article 799-
dc.description.otherThe 10th Annual Meeting of the Vision Sciences Society (VSS 2010), Naples, FL., 7-12 May 2010. In Journal of Vision, 2010, v. 10 n. 7, article 799-

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