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Papers by Robert S Allison

Research paper thumbnail of Effects of Frame Rate on Vection and Postural Sway

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Research paper thumbnail of Higher-order cognitive processes moderate body tilt effects in vection

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Research paper thumbnail of Smoothness of stimulus motion can affect vection strength

Experimental brain research, 2018

We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulu... more We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulus motion was modulated by varying the number of frames comprising the movement. In this study, a horizontal grating translated through 360° of phase in 1 s divided into steps of 3, 4, 6, 12, 20, 30, or 60 frames. We hypothesized that smoother motion should induce stronger vection because the smoother stimulus is more natural and contains more motion energy. We examined this effect of frame number on vection for both downward (Experiment 1) and expanding (Experiment 2) optical flow. The results clearly showed that vection strength increased with increasing frame rate, however, the rates of increase in the vection strength with frame rate are not constant, but rapidly increase in the low frame-rate range and appear to asymptote in the high range. The strength estimates saturated at lower frame rates for expanding flow than for downward flow. This might be related to the fact that to proces...

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Research paper thumbnail of Analysis of the Influence of Vertical Disparities Arising in Toed-in Stereoscopic Cameras

Journal of Imaging Science and Technology

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Research paper thumbnail of Distortions of Space in Stereoscopic 3D Content

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Research paper thumbnail of Howard’s Devices

Perception Ecvp Abstract, 2014

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Research paper thumbnail of Illusory scene shearing during real and illusory self-rotations in roll

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Research paper thumbnail of The application of circular statistics to psychophysical research.

Directional data arising from psychophysical studies requires careful processing due to its cycli... more Directional data arising from psychophysical studies requires careful processing due to its cyclical nature. Unlike linear variables such as response time and intensity, directions can be represented as angles or vectors on a circle, may have no natural zero-point or magnitude, and are defined on a periodic circle rather than an infinite line. Because of these unique features, directional data necessitates the use of circular statistical methods; however, unfamiliarity and limited availability of software that support circular data analysis have largely led to its under-use and misapplication. Here the implications of using linear statistics for circular data were explored by submitting data from a behavioural study to both circular and linear statistical analysis.

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Research paper thumbnail of Visual perception of smooth and perturbed self-motion

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Research paper thumbnail of Effects of network delay on a collaborative motor task with telehaptic and televisual feedback

Proceedings of the 2004 ACM SIGGRAPH international conference on Virtual Reality continuum and its applications in industry - VRCAI '04, 2004

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Research paper thumbnail of Psychophysics of night vision device halo

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Research paper thumbnail of Effect of disparity noise on sterescopic surface perception in human and ideal observers

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Research paper thumbnail of Visibility of Color Breakup Phenomena in Displays Based on Narrowband Spectral Sources

Display Technology Journal of, Apr 1, 2012

The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objecti... more The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objectionable in laser projectors compared to conventional digital projectors was investigated. Untrained observers viewed movie clips in a theater and made image quality ratings. The same four clips were presented on both a standard Xenon display and a prototype laser projector in separate blocks. There was no evidence that observers noticed color break-up artefacts using either mode of presentation.

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Research paper thumbnail of A vision-based head tracking system for fully immersive displays

Proceedings of the Workshop on Virtual Environments 2003, May 22, 2003

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Research paper thumbnail of Binocular slant discrimination beyond interaction space

J Vision, 2010

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Research paper thumbnail of The effect of interocular separation on perceived depth from disparity in complex scenes

F1000posters, Sep 13, 2011

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Research paper thumbnail of The Camera Convergence Problem Revisited

Proceedings of Spie the International Society For Optical Engineering, May 1, 2004

The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allis... more The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allison. Abstract. Convergence of the real or virtual stereoscopic cameras is an important operation in stereoscopic display systems. ...

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Research paper thumbnail of Temporal Dependencies In Resolving

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Research paper thumbnail of The relative role of visual and non-visual cues in determiningthe perceived direction of "up": Experiments in parabolic flight

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Research paper thumbnail of Sensitivity to monocular occlusions in stereoscopic imagery: Implications for S3D content creation, distribution and exhibition

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Research paper thumbnail of Effects of Frame Rate on Vection and Postural Sway

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Research paper thumbnail of Higher-order cognitive processes moderate body tilt effects in vection

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Smoothness of stimulus motion can affect vection strength

Experimental brain research, 2018

We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulu... more We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulus motion was modulated by varying the number of frames comprising the movement. In this study, a horizontal grating translated through 360° of phase in 1 s divided into steps of 3, 4, 6, 12, 20, 30, or 60 frames. We hypothesized that smoother motion should induce stronger vection because the smoother stimulus is more natural and contains more motion energy. We examined this effect of frame number on vection for both downward (Experiment 1) and expanding (Experiment 2) optical flow. The results clearly showed that vection strength increased with increasing frame rate, however, the rates of increase in the vection strength with frame rate are not constant, but rapidly increase in the low frame-rate range and appear to asymptote in the high range. The strength estimates saturated at lower frame rates for expanding flow than for downward flow. This might be related to the fact that to proces...

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Research paper thumbnail of Analysis of the Influence of Vertical Disparities Arising in Toed-in Stereoscopic Cameras

Journal of Imaging Science and Technology

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Research paper thumbnail of Distortions of Space in Stereoscopic 3D Content

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Howard’s Devices

Perception Ecvp Abstract, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Illusory scene shearing during real and illusory self-rotations in roll

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The application of circular statistics to psychophysical research.

Directional data arising from psychophysical studies requires careful processing due to its cycli... more Directional data arising from psychophysical studies requires careful processing due to its cyclical nature. Unlike linear variables such as response time and intensity, directions can be represented as angles or vectors on a circle, may have no natural zero-point or magnitude, and are defined on a periodic circle rather than an infinite line. Because of these unique features, directional data necessitates the use of circular statistical methods; however, unfamiliarity and limited availability of software that support circular data analysis have largely led to its under-use and misapplication. Here the implications of using linear statistics for circular data were explored by submitting data from a behavioural study to both circular and linear statistical analysis.

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Research paper thumbnail of Visual perception of smooth and perturbed self-motion

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Research paper thumbnail of Effects of network delay on a collaborative motor task with telehaptic and televisual feedback

Proceedings of the 2004 ACM SIGGRAPH international conference on Virtual Reality continuum and its applications in industry - VRCAI '04, 2004

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Research paper thumbnail of Psychophysics of night vision device halo

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effect of disparity noise on sterescopic surface perception in human and ideal observers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Visibility of Color Breakup Phenomena in Displays Based on Narrowband Spectral Sources

Display Technology Journal of, Apr 1, 2012

The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objecti... more The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objectionable in laser projectors compared to conventional digital projectors was investigated. Untrained observers viewed movie clips in a theater and made image quality ratings. The same four clips were presented on both a standard Xenon display and a prototype laser projector in separate blocks. There was no evidence that observers noticed color break-up artefacts using either mode of presentation.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A vision-based head tracking system for fully immersive displays

Proceedings of the Workshop on Virtual Environments 2003, May 22, 2003

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Research paper thumbnail of Binocular slant discrimination beyond interaction space

J Vision, 2010

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Research paper thumbnail of The effect of interocular separation on perceived depth from disparity in complex scenes

F1000posters, Sep 13, 2011

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Research paper thumbnail of The Camera Convergence Problem Revisited

Proceedings of Spie the International Society For Optical Engineering, May 1, 2004

The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allis... more The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allison. Abstract. Convergence of the real or virtual stereoscopic cameras is an important operation in stereoscopic display systems. ...

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Research paper thumbnail of Temporal Dependencies In Resolving

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Research paper thumbnail of The relative role of visual and non-visual cues in determiningthe perceived direction of "up": Experiments in parabolic flight

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sensitivity to monocular occlusions in stereoscopic imagery: Implications for S3D content creation, distribution and exhibition

Bookmarks Related papers MentionsView impact