Robert Dister

University of California, Berkeley

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Theodore E. Cohn

University of California, Berkeley

Russell D. Hamer

Smith-Kettlewell Eye Research Institute

David J. Lasley

University of California, Berkeley

D. J. Lasley

University of California, Berkeley

Richard Hamer

United Church of Christ

Cooperative Institutions

University of California, Berkeley

Berkeley College

University of Miami

Smith-Kettlewell Eye Research Institute

Florida Atlantic University

Universidade de São Paulo

Sociedade Brasileira de Psicologia

Sociedade Brasileira de Neurociências e Comportamento

Instituto da Visão

University of Washington

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Postural stability and stereo-ambiguity in man-designed visual environments

IEEE Transactions on Biomedical Engineering (1991)

D. J. Lasley Russell D. Hamer Robert Dister Theodore E. Cohn

Measuring postural stability in the presence of a stereoambiguous stimulus is discussed. The existence of the following elements of the theoretical chain of events which leads to disorientation is shown for the first time: (a) inappropriate binocular convergence consistent with false fusion, and the wallpaper illusion, (b) heightened postural instability, and (c) correlation between subjective disorientation and postural instability. The modern rectilinear visual environment contains visual stimuli for which evolution has not had time to optimally shape visual processing. One such stimulus, periodic stripes, is known to lead to visual depth ambiguity. The authors show that postural instability, as measured by the variance of fore and aft sway, is increased by viewing such stimuli. This instability may be the precursor of falls. Designers must evaluate the visual impressions conveyed by their systems in order to avoid postural instability due to visual ambiguity.< >

10.1109/10.83593

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Citations (19)

Postural Stability and Stereo-Ambiguity in Man-Designed Visual Environments

University of California Transportation Center (1991)

David J. Lasley Russell D. Hamer Robert Dister Theodore E. Cohn

Our modern rectilinear visual environment contains visual stimuli for which evolution has not had time to optimally shape visual processing. One such stimulus, periodic stripes, is known to lead to visual depth ambiguity. In this paper we show that postural instability, as measured by the variance of fore and aft sway, is increased by viewing such stimuli. This instability may be the precursor of falls. Designers must evaluate the visual impressions conveyed by their systems in order to avoid postural instability due to visual ambiguity.

Stimulus (psychology)

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Postural Stability and Stereo-Ambiguity in Man-Designed Visual Environments

RePEc: Research Papers in Economics (1991)

David J. Lasley Russell D. Hamer Robert Dister Theodore E. Cohn

Stimulus (psychology)

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Masking for safety: preventing a visual depth illusion

Annual Meeting Optical Society of America (1985)

Richard Hamer D. J. Lasley Robert Dister Theodore E. Cohn

Earlier we reported that visual disorientation is one by-product of the visual depth illusion produced by the pattern of repeating vertical stripes on an escalator tread. 1 We have also shown that a high-contrast vertical square-wave grating chosen to simulate the look of an escalator tread at a viewing distance of 2 m, induces postural instability. 2 In this study we have altered an escalator by painting on a pattern with minimal horizontal periodicity. Tests comparing the painted machine to one otherwise identical reveal a significant reduction of subjective disorientation among normally sighted individuals. In addition, postural instability while viewing the painted machine is significantly less than while viewing the control machine.

Visual masking

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High contrast

10.1364/oam.1985.wf2

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