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Effects of visual flow display of flight maneuvers on perceived spatial orientation
(FOI, Swedish Defence Research Agency, Linköping, Sweden)
Uppsala universitet.
2005 (English)In: Human Factors, ISSN 0018-7208, E-ISSN 1547-8181, Vol. 47, no 2, 378-393 p.Article in journal (Refereed) Published
Abstract [en]

Postural responses were utilized as measures of the effectiveness of a wide-angle visual flow display in determining perceived spatial orientation (SO). The general experimental setup included a 150 degrees x 34 degrees wide-field display showing flight over computer-generated ground with horizon. Simulated roll maneuvers on this display induced postural sway in the observer that was registered by a head-tracker system. Two experiments with 16 participants in each investigated the effects of visual flow, display exclusions in the central visual field, and display extensions into the visual periphery. Clear vestibular and proprioceptive suppression effects were demonstrated on postural sway with the inclusion of visual flow of forward ego motion in roll maneuvers. Compared with the full view, up to 20 degrees x 20 degrees central field omission either did not reduce the effect or reduced the effect but, frequently, only moderately. Limiting the display area to 45 degrees in the horizontal dimension reduced display effectiveness significantly, whereas a 105 degrees area did not, compared with the full view. Utilizing postural responses as indications of visual display resonance with our SO mechanism, actual or potential applications of this research include the design of an interface integrating flight-adapted visual flow to counteract or reduce pilot spatial disorientation.

Place, publisher, year, edition, pages
2005. Vol. 47, no 2, 378-393 p.
National Category
Psychology
Research subject
Psychology
Identifiers
URN: urn:nbn:se:kau:diva-28858OAI: oai:DiVA.org:kau-28858DiVA: diva2:645156
Available from: 2013-09-03 Created: 2013-09-03 Last updated: 2013-10-08Bibliographically approved
In thesis
1. Visual flow display for pilot spatial orientation
Open this publication in new window or tab >>Visual flow display for pilot spatial orientation
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Pilot spatial disorientation (SD) is a significant cause of incidents and fatal accidents in aviation. The pilot is susceptible to SD especially in low visibility when the visual system is deprived of information from outside the cockpit. This thesis presents the notion of visual flow displays as enhancement of symbology on flight displays primarily in low visibility for improved support of the pilot’s spatial orientation (SO) and control actions.

In Studies I and II, synthetic visual flow of forward ego-motion was presented on displays and postural responses were used as measures of display effectiveness in determining SO. The visual flow significantly affected SO, and although the increased stimulation of the visual periphery from a width of 45° to about 105° increased the effects there was no further effect at a width of about 150° (Studies I and II). Studies I and II also showed that omitting 20°- or 30°-wide central fields of view from the visual flow either reduced or not reduced the effects. Further, although inconclusive, Study II may indicate that horizon symbology in central visual field may enhance the effects of peripheral visual flow. The appropriate integration of peripheral visual flow with the head-up display symbology of the Gripen aircraft was presented.

Acceleration in a human centrifuge was used in Study III to investigate the effects of synthetic visual flow on the primarily vestibular-dependent somatogravic illusion of pitch-up. Two experiments revealed a reduced illusion with the visual flow. The results of Experiment 2 showed the visual flow scene not only reduced the illusion compared with a darkness condition but also compared with the visual scene without visual flow. Thus, similar to the main findings of Studies I and II, synthetic visual flow can significantly affect SO and supports the visually dependent SO system in an essential manner.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 110 p.
Series
, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 1652-9030 ; 53
Keyword
Optic flow, visual flow, peripheral vision, spatial orientation, spatial disorientation, postural control, somatogravic illusion, human centrifuge, flight displays, head-up display, head-mounted display
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:kau:diva-28863 (URN)978-91-554-7684-7 (ISBN)
Public defence
2010-01-29, Uppsala, 14:42 (English)
Opponent
Supervisors
Available from: 2013-09-04 Created: 2013-09-03 Last updated: 2013-09-04Bibliographically approved

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http://hfs.sagepub.com/content/47/2/378.full.pdf

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