Robert S. Allison
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View article: Visual Factors in Cybersickness: A Literature Survey and Meta-Analysis
Visual Factors in Cybersickness: A Literature Survey and Meta-Analysis Open
Cybersickness, a common adverse side-effect of virtual-reality exposure, is characterised by a constellation of symptoms including nausea, disorientation, and oculomotor disturbances. This review synthesises findings in the literature to e…
View article: Bilateral Distribution Compression: Reducing Both Data Size and Dimensionality
Bilateral Distribution Compression: Reducing Both Data Size and Dimensionality Open
Existing distribution compression methods reduce dataset size by minimising the Maximum Mean Discrepancy (MMD) between original and compressed sets, but modern datasets are often large in both sample size and dimensionality. We propose Bil…
View article: DVP predicts the probability of becoming sick and dropout times during head mounted display based virtual reality
DVP predicts the probability of becoming sick and dropout times during head mounted display based virtual reality Open
When head-mounted display (HMD) users move their heads during virtual reality (VR), display lag will generate differences between their virtual and physical head pose (DVP). Previously, we have shown that objective estimates of DVP can be …
View article: Nonlinear analysis of the effects of vision and postural threat on upright stance
Nonlinear analysis of the effects of vision and postural threat on upright stance Open
RQA identified differences in sway dynamics across both vision and height conditions that linear methods failed to detect. They represented greater randomness and adaptability in response to increased fear (HIGH) or decreased sensory infor…
View article: Conditional Distribution Compression via the Kernel Conditional Mean Embedding
Conditional Distribution Compression via the Kernel Conditional Mean Embedding Open
Existing distribution compression methods, like Kernel Herding (KH), were originally developed for unlabelled data. However, no existing approach directly compresses the conditional distribution of labelled data. To address this gap, we fi…
View article: The Ripple Effect of Vulnerabilities in Maven Central: Prevalence, Propagation, and Mitigation Challenges
The Ripple Effect of Vulnerabilities in Maven Central: Prevalence, Propagation, and Mitigation Challenges Open
The widespread use of package managers like Maven has accelerated software development but has also introduced significant security risks due to vulnerabilities in dependencies. In this study, we analyze the prevalence and impact of vulner…
View article: Binocular contributions to motion detection and motion discrimination during locomotion
Binocular contributions to motion detection and motion discrimination during locomotion Open
During locomotion, the visual system can factor out the motion component caused by observer locomotion from the complex target flow vector to obtain the world-relative target motion. This process, which has been termed flow parsing, is kno…
View article: The impact of gravity on perceived object height
The impact of gravity on perceived object height Open
Altering posture relative to the direction of gravity, or exposure to microgravity has been shown to affect many aspects of perception, including size perception. Our aims in this study were to investigate whether changes in posture and lo…
View article: Subjective assessment of visual fidelity: Comparison of forced‐choice methods
Subjective assessment of visual fidelity: Comparison of forced‐choice methods Open
Increases in display resolution, frame rate, and bit depth, particularly with advances in stereoscopic 3D (S3D) displays, have increased demand for efficient compression throughout the imaging pipeline. To meet such requirements, typically…
View article: Vection and Performance During Attention-Demanding Tasks in Virtual Reality
Vection and Performance During Attention-Demanding Tasks in Virtual Reality Open
We investigated how attention-demanding aural and visual discrimination tasks attenuate visually-induced self-motion (vection) and how task accuracy and response time are affected by experiencing various levels of vection-inducing motion i…
View article: Further Understanding of a Local Gaussian Process Approximation: Characterising Convergence in the Finite Regime
Further Understanding of a Local Gaussian Process Approximation: Characterising Convergence in the Finite Regime Open
We show that common choices of kernel functions for a highly accurate and massively scalable nearest-neighbour based GP regression model (GPnn: \cite{GPnn}) exhibit gradual convergence to asymptotic behaviour as dataset-size $n$ increases.…
View article: Testing the ‘differences in virtual and physical head pose’ and ‘subjective vertical conflict’ accounts of cybersickness
Testing the ‘differences in virtual and physical head pose’ and ‘subjective vertical conflict’ accounts of cybersickness Open
When we move our head while in virtual reality, display lag will generate differences in our virtual and physical head pose (known as DVP). While DVP are a major trigger for cybersickness, theories differ as to exactly how they constitute …
View article: Effects of Constant and Time-Varying Display Lag on DVP and Cybersickness When Making Head-Movements in Virtual Reality
Effects of Constant and Time-Varying Display Lag on DVP and Cybersickness When Making Head-Movements in Virtual Reality Open
When HMD users move their heads in virtual reality (VR), display lag creates differences between their virtual and physical head pose (DVP). This study examined whether objective estimates of DVP could predict experiences of cybersickness …
View article: Perceiving depth and motion in depth from successive occlusion
Perceiving depth and motion in depth from successive occlusion Open
Occlusion, or interposition, is one of the strongest and best-known pictorial cues to depth. Furthermore, the successive occlusions of previous objects by newly presented objects produces an impression of increasing depth. Although the per…
View article: Vection does not facilitate flow parsing
Vection does not facilitate flow parsing Open
The perception of self-motion can be induced or enhanced by exposure to visual stimuli such as optic flow. It has also been shown that consistent stereoscopic information enhances visually-induced self-motion perception (vection). Converse…
View article: Increasing motion parallax gain compresses space and 3D object shape
Increasing motion parallax gain compresses space and 3D object shape Open
When moving about the world, humans rely on visual, proprioceptive and vestibular cues to perceive depth and distance. Normally, these sources of information are consistent. However, what happens if we receive conflicting information about…
View article: Conflicting ordinal depth information interferes with visually-guided reaching
Conflicting ordinal depth information interferes with visually-guided reaching Open
Normally we integrate ordinal (occlusion) and metric (e.g., binocular disparity) depth information to obtain a unified percept of 3D layout. Further, quantitative depth must be available to the proprioceptive and motor systems to support i…