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Perceived Display Speed Helps Account For The 'Jitter Advantage' In Vection, D Apthorp, S Palmisano
Perceived Display Speed Helps Account For The 'Jitter Advantage' In Vection, D Apthorp, S Palmisano
Faculty of Health and Behavioural Sciences - Papers (Archive)
Illusions of self-motion in depth ('vection') are strongly enhanced when coherent viewpoint oscillation or jitter is added to the inducing optic flow displays (Palmisano et al, 2010 Perception2957-67). The underlying cause of this "jitter advantage" is still unknown. Here we investigate the possibility that perceived speed plays a role, since other manipulations that increase perceived speed (adding stereo, using contracting rather than expanding flow) also increase vection in depth, and reducing perceived speed reduces vection. First, in a 2AFC procedure, we measured PSEs for smooth and vertically oscillating motion-in-depth displays; oscillating displays were uniformly perceived as faster. Then we used …
Simulated Viewpoint Jitter Shakes Sensory Conflict Accounts Of Vection, Stephen A. Palmisano, Robert S Allison, Juno Kim, Frederick Bonato
Simulated Viewpoint Jitter Shakes Sensory Conflict Accounts Of Vection, Stephen A. Palmisano, Robert S Allison, Juno Kim, Frederick Bonato
Faculty of Health and Behavioural Sciences - Papers (Archive)
Sensory conflict has been used to explain the way we perceive and control our self-motion, as well as the aetiology of motion sickness. However, recent research on simulated viewpoint jitter provides a strong challenge to one core prediction of these theories — that increasing sensory conflict should always impair visually induced illusions of self-motion (known as vection). These studies show that jittering self-motion displays (thought to generate significant and sustained visual–vestibular conflict) actually induce superior vection to comparable non-jittering displays (thought to generate only minimal/transient sensory conflict). Here we review viewpoint jitter effects on vection, postural sway, eye-movements and motion …
Effects Of Simulated Viewpoint Jitter On Visually Induced Postural Sway, Stephen A. Palmisano, Gavin J. Pinniger, April Ash, Julie R. Steele
Effects Of Simulated Viewpoint Jitter On Visually Induced Postural Sway, Stephen A. Palmisano, Gavin J. Pinniger, April Ash, Julie R. Steele
Faculty of Health and Behavioural Sciences - Papers (Archive)
In this study we examined the effects of simulated horizontal and vertical viewpoint jitter on the vection and postural sway induced by radial patterns of optic flow. During each trial, observers were exposed sequentially to 20 s periods of radially expanding flow, radially contracting flow, and static visual scenes. For half the trials, simulated viewpoint jitter was added to the radially expanding/contracting optic flow patterns. In experiment 1, we found that, while this jitter increased the backward postural sway induced by radial expansion, it actually decreased forward postural sway induced by radial contraction. However, in experiment 2 we found that …
Jitter And Size Effects On Vection Are Immune To Experimental Instructions And Demands, Stephen A. Palmisano, Amy Y. Chan
Jitter And Size Effects On Vection Are Immune To Experimental Instructions And Demands, Stephen A. Palmisano, Amy Y. Chan
Faculty of Health and Behavioural Sciences - Papers (Archive)
Both coherent perspective jitter and explicit changing-size cues have been shown to improve the vection induced by radially expanding optic flow. The current study examined whether these stimulus-based vection advantages could be modified by altering cognitions/expectations about both the likelihood of self-motion perception and the purpose of the experiment. In the main experiment, participants were randomly assigned into two groups – one where the cognitive conditions biased participants towards self-motion perception and another where the cognitive conditions biased them towards object motion perception. Contrary to earlier findings by Lepecq et al (1995), we found that identical visual displays were less …
Coherent Perspective Jitter Induces Visual Illusions Of Self-Motion, Stephen A. Palmisano, Darren Burke, Robert S Allison
Coherent Perspective Jitter Induces Visual Illusions Of Self-Motion, Stephen A. Palmisano, Darren Burke, Robert S Allison
Faculty of Health and Behavioural Sciences - Papers (Archive)
Previous research by Palmisano, Gillam and Blackburn (2000) found that adding coherent perspective jitter to constant velocity radial flow improved visually induced illusions of self-motion (known as vection). This was a surprising finding, because unlike pure radial flow, this jittering radial flow should have generated sustained visual-vestibular conflicts - previously thought to always reduce/impair vection. The current experiments attempted to ascertain the essential stimulus features for this jitter advantage for vection by examining three novel types of jitter display. While adding incoherent jitter to radial flow was found to impair vection, adding coherent non-perspective jitter had little effect on this …
Global-Perspective Jitter Improves Vection In Central Vision, Stephen A. Palmisano, Barbara Gillam, Shane Blackburn
Global-Perspective Jitter Improves Vection In Central Vision, Stephen A. Palmisano, Barbara Gillam, Shane Blackburn
Faculty of Health and Behavioural Sciences - Papers (Archive)
Previous vection research has tended to minimise visual - vestibular conflict by using optic-flow patterns which simulate self-motions of constant velocity. Here, experiments are reported on the effect of adding 'global-perspective jitter' to these displays -- simulating forward motion of the observer on a platform oscillating in horizontal and/or vertical dimensions. Unlike non-jittering displays, jittering displays produced a situation of sustained visual - vestibular conflict. Contrary to the prevailing notion that visual - vestibular conflict impairs vection, jittering optic flow was found to produce shorter vection onsets and longer vection durations than non-jittering optic flow for all of jitter magnitudes …