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Conference Paper: Humans can control heading independent of visual path information

TitleHumans can control heading independent of visual path information
Authors
Issue Date2008
PublisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/
Citation
The 2008 Annual Meeting of the Vision Sciences Society (VSS 2008), Naples, FL., 9-14 May 2008. In Journal of Vision, 2008, v. 8 n. 6, p. 1160 How to Cite?
AbstractOne's instantaneous direction of self-translation (heading) and one's future trajectory (path) are two defining features of human locomotion. Using a dynamic optic-flow display in which environmental points were periodically redrawn to minimize the path information, we have previously shown that humans can perceive heading without visual path information (Li, Sweet, & Stone, JOV 2006). Here we explore the use of visual path information in active heading control. The display (110° H × 94° V) simulated an vehicle traveling on a clockwise or counterclockwise circular path (yaw rate: ±4°/s) through a random-dot 3D cloud (depth range: 6–50 m) at 8 m/s under two conditions: “static scene” in which dots were displayed until they left the field of view thus containing both optic flow and path information, and “dynamic scene” in which dot lifetime was limited to 100 ms thus removing path information. Five observers (3 naïve) used a joystick to steer and align their vehicle line of sight with true heading as their simulated vehicle yaw orientation was perturbed by the sum of 7 harmonically-unrelated (0.1 to 2.19 Hz) sinusoids. The joystick displacement generated a command proportional to the rate of change of the simulated yaw vehicle angle. Time series (90 s) of heading error and joystick displacement were Fourier analyzed and averaged across 6 trials. For all observers, overall error was similar in both conditions (mean absolute heading error ± RMS across observers: 4.2±5.9° and 4.0±6.3°, for static and dynamic scenes, respectively). However, model-based analysis of the frequency response (Li, Sweet, & Stone, IEEE 2006) shows a significant decrease in lead time constant (ratio of velocity to position gain) for static scenes. We conclude that humans can accurately control their heading from optic flow independent of path, but path information reduces low-frequency ([[lt]]0.3 Hz) drift, when available.
Persistent Identifierhttp://hdl.handle.net/10722/110057
ISSN
2015 Impact Factor: 2.341
2015 SCImago Journal Rankings: 1.042

 

DC FieldValueLanguage
dc.contributor.authorPeng, Xen_HK
dc.contributor.authorStone, Len_HK
dc.contributor.authorLi, Len_HK
dc.date.accessioned2010-09-26T01:49:19Z-
dc.date.available2010-09-26T01:49:19Z-
dc.date.issued2008en_HK
dc.identifier.citationThe 2008 Annual Meeting of the Vision Sciences Society (VSS 2008), Naples, FL., 9-14 May 2008. In Journal of Vision, 2008, v. 8 n. 6, p. 1160en_HK
dc.identifier.issn1534-7362en_HK
dc.identifier.urihttp://hdl.handle.net/10722/110057-
dc.description.abstractOne's instantaneous direction of self-translation (heading) and one's future trajectory (path) are two defining features of human locomotion. Using a dynamic optic-flow display in which environmental points were periodically redrawn to minimize the path information, we have previously shown that humans can perceive heading without visual path information (Li, Sweet, & Stone, JOV 2006). Here we explore the use of visual path information in active heading control. The display (110° H × 94° V) simulated an vehicle traveling on a clockwise or counterclockwise circular path (yaw rate: ±4°/s) through a random-dot 3D cloud (depth range: 6–50 m) at 8 m/s under two conditions: “static scene” in which dots were displayed until they left the field of view thus containing both optic flow and path information, and “dynamic scene” in which dot lifetime was limited to 100 ms thus removing path information. Five observers (3 naïve) used a joystick to steer and align their vehicle line of sight with true heading as their simulated vehicle yaw orientation was perturbed by the sum of 7 harmonically-unrelated (0.1 to 2.19 Hz) sinusoids. The joystick displacement generated a command proportional to the rate of change of the simulated yaw vehicle angle. Time series (90 s) of heading error and joystick displacement were Fourier analyzed and averaged across 6 trials. For all observers, overall error was similar in both conditions (mean absolute heading error ± RMS across observers: 4.2±5.9° and 4.0±6.3°, for static and dynamic scenes, respectively). However, model-based analysis of the frequency response (Li, Sweet, & Stone, IEEE 2006) shows a significant decrease in lead time constant (ratio of velocity to position gain) for static scenes. We conclude that humans can accurately control their heading from optic flow independent of path, but path information reduces low-frequency ([[lt]]0.3 Hz) drift, when available.-
dc.languageengen_HK
dc.publisherAssociation for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/en_HK
dc.relation.ispartofJournal of Visionen_HK
dc.titleHumans can control heading independent of visual path informationen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1534-7362&volume=8&issue=6&spage=1160&epage=&date=2008&atitle=Humans+Can+Control+Heading+Independent+Of+Visual+Path+Informationen_HK
dc.identifier.emailLi, L: lili8816@gmail.comen_HK
dc.identifier.authorityLi, L=rp00636en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1167/8.6.1160-
dc.identifier.hkuros143193en_HK
dc.identifier.volume8en_HK
dc.identifier.issue6en_HK
dc.identifier.issue6-
dc.identifier.spage1160en_HK
dc.identifier.epage1160-

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