Effects of rotation on somatogravic illusions

Lessard, Charles S.; Matthews, R. S.; Yauch, D. W.

doi:10.1109/51.827407

Cited by 6 publications

(10 citation statements)

References 4 publications

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“…Visual flow is a critical factor for perceiving body orientation relative to the Earth-fixed frame of reference and it may dominate kinesthetic and vestibular proprioception (e.g. Gibson, 1966;Lee, 1980;Lessard, Matthews, & Yauch, 2000;Lishman & Lee, 1973;Warren, Kay, Zosh, Duchon, & Sahuc, 2001). It has been stressed that wide field-of-view (FOV) displays, including peripheral vision, are better suited for supporting SO (Leibowitz, 1988;Malcolm, 1984;Wickens & Hollands, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have investigated the impact of visual cues on the SGI by utilizing different visual presentations while changing the gravitoinertial vector on motion platforms, human-use centrifuges (Lessard et al, 2000;Previc, Varner, & Gillingham, 1992;Tokamura, Kaida, Ashida, Mizumoto, & Tatsuno, 1998), or in devices allowing sub-threshold tilting of observers (e.g. MacNeilage, Berger, von der Heyde, Banks, & Bülthoff, 2003).…”

Section: Introductionmentioning

confidence: 99%

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On Reducing the Somatogravic Illusion with Hmd Conveyed Visual Flow

Eriksson

Tribukait

Hofsten

et al. 2006

Proceedings of the Human Factors and Ergonomics Society Annual

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The acceleration-induced somatogravic illusion (SGI) is part of the pilot spatial disorientation (SD) problem. The effect of visual flow on the SGI was investigated in 13 non-pilots equipped with a head-tracked head-mounted display (HMD) in a human-use centrifuge. The participant was seated in a fixed gondola facing the rotation center of rotation of the centrifuge, and by increasing the angular speed of the centrifuge the centripetal acceleration was increased from near-zero to 0.57Gx. The final gravitoinertial force vector was 1.15G corresponding to a 30° pitch-up. During acceleration of the centrifuge, the participant viewed either a HMD presentation of moving texture elements beneath a stationary horizon, representing a forward linear acceleration, or a darkened HMD without any orientation cues. By means of an adjustable plate the participant continually indicated the perceived horizontal plane. Although there was a great inter-individual variability in the magnitude of the SGI, the overall results suggest that HMD conveyed visual flow might reduce SGI in non-pilots.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On Reducing the Somatogravic Illusion with Hmd Conveyed Visual Flow

Eriksson

Tribukait

Hofsten

et al. 2006

Proceedings of the Human Factors and Ergonomics Society Annual

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“…Several studies have investigated the impact of visual cues on the SGI by using various visual presentations while changing the gravitoinertial vector on motion platforms and in human-use centrifuges ( 15,25,26 ), or in devices allowing sub-threshold tilting of observers ( 19 ). These studies included visual fl ow conditions, but only one reported a signifi cant and convincing suppression effect of visual fl ow on the illusory pitch-up.…”

mentioning

confidence: 99%

“…Based on several unsuccessful attempts to break the illusion, Previc ( 22 ) accordingly points to the particular resistance of the SGI in non-pilots, despite having used such a large fi eld of view of 58° 3 114° and nearly collimated scene images. It may thus suggest that there is a recalibration of the pilot's sensory system, resulting in a greater weighting of cues of visual horizon and visual fl ow ( 5,9,15 ).…”

mentioning

confidence: 99%

“…The synthetic presentation could otherwise be perceived as anchored to the cockpit. Although differing in other relevant respects, Lessard et al ( 15 ), Tokumaru et al ( 26 ), and MacNeilage et al ( 19 ) all used an ' external display ' and did not correct for the changing observer perspective. Previc et al ( 25 ) used a head-mounted display (HMD), but did not have the technical means to correct for the observer's head movements.…”

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confidence: 99%

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Visual Flow Scene Effects on the Somatogravic Illusion in Non-Pilots

Eriksson¹,

Hofsten²,

Tribukait³

et al. 2008

aviat space environ med

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A Bayesian model of the disambiguation of gravitoinertial force by visual cues

et al. 2006

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The otoliths are stimulated in the same fashion by gravitational and inertial forces, so otolith signals are ambiguous indicators of self-orientation. The ambiguity can be resolved with added visual information indicating orientation and acceleration with respect to the earth. Here we present a Bayesian model of the statistically optimal combination of noisy vestibular and visual signals. Likelihoods associated with sensory measurements are represented in an orientation/acceleration space. The likelihood function associated with the otolith signal illustrates the ambiguity; there is no unique solution for self-orientation or acceleration. Likelihood functions associated with other sensory signals can resolve this ambiguity. In addition, we propose two priors, each acting on a dimension in the orientation/acceleration space: the idiotropic prior and the no-acceleration prior. We conducted experiments using a motion platform and attached visual display to examine the influence of visual signals on the interpretation of the otolith signal. Subjects made pitch and acceleration judgments as the vestibular and visual signals were manipulated independently. Predictions of the model were confirmed: (1) visual signals affected the interpretation of the otolith signal, (2) less variable signals had more influence on perceived orientation and acceleration than more variable ones, and (3) combined estimates were more precise than single-cue estimates. We also show that the model can explain some well-known phenomena including the perception of upright in zero gravity, the Aubert effect, and the somatogravic illusion.

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Effects of rotation on somatogravic illusions

Cited by 6 publications

References 4 publications

On Reducing the Somatogravic Illusion with Hmd Conveyed Visual Flow

On Reducing the Somatogravic Illusion with Hmd Conveyed Visual Flow

Visual Flow Scene Effects on the Somatogravic Illusion in Non-Pilots

A Bayesian model of the disambiguation of gravitoinertial force by visual cues

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