scholarly journals Speed judgments of background motion and illusion of self-motion when viewing sinusoidal visual stimuli along fore-and-aft axis with different frequencies and velocities

2014 ◽  
Vol 14 (10) ◽  
pp. 1356-1356
Author(s):  
D. Chen ◽  
R. So
Keyword(s):  
Visual Stimuli ◽  
Background Motion ◽  
Self Motion

scholarly journals Postural responses to specific types of long-term memory during visually induced roll self-motion

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261266
Author(s):  
Maëlle Tixier ◽  
Stéphane Rousset ◽  
Pierre-Alain Barraud ◽  
Corinne Cian
Keyword(s):  
Visual Motion ◽  
Memory Task ◽  
Cognitive Tasks ◽  
Long Term Memory ◽  
Uniform Motion ◽  
Term Memory ◽  
Postural Responses ◽  
Background Motion ◽  
Self Motion

A large body of research has shown that visually induced self-motion (vection) and cognitive processing may interfere with each other. The aim of this study was to assess the interactive effects of a visual motion inducing vection (uniform motion in roll) versus a visual motion without vection (non-uniform motion) and long-term memory processing using the characteristics of standing posture (quiet stance). As the level of interference may be related to the nature of the cognitive tasks used, we examined the effect of visual motion on a memory task which requires a spatial process (episodic recollection) versus a memory task which does not require this process (semantic comparisons). Results confirm data of the literature showing that compensatory postural response in the same direction as background motion. Repeatedly watching visual uniform motion or increasing the cognitive load with a memory task did not decrease postural deviations. Finally, participants were differentially controlling their balance according to the memory task but this difference was significant only in the vection condition and in the plane of background motion. Increased sway regularity (decreased entropy) combined with decreased postural stability (increase variance) during vection for the episodic task would indicate an ineffective postural control. The different interference of episodic and semantic memory on posture during visual motion is consistent with the involvement of spatial processes during episodic memory recollection. It can be suggested that spatial disorientation due to visual roll motion preferentially interferes with spatial cognitive tasks, as spatial tasks can draw on resources expended to control posture.

Perceptually Plausible Sounds Facilitate Visually Induced Self-Motion Perception (Vection)

Perception ◽  
10.1068/p7184 ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 577-593 ◽  
Author(s):  
Takeharu Seno ◽  
Emi Hasuo ◽  
Hiroyuki Ito ◽  
Yoshitaka Nakajima
Keyword(s):  
Motion Perception ◽  
Visual Motion ◽  
Visual Stimuli ◽  
Horizontal Direction ◽  
Auditory Stimuli ◽  
Motion Field ◽  
Self Motion

We examined whether and how sounds influence visually induced illusory self-motion (vection). Visual stimuli were presented for 40 s. They were made radially, expanding or contracting visual motion field and luminance-defined gratings drifting in a vertical or horizontal direction. Auditory stimuli were presented with the visual stimuli in most conditions; we employed sounds that increased or decreased in intensity, or ascended or descended in frequency. As a result, the sound which increased in intensity facilitated forward vection, and the sound which ascended/descended in frequency facilitated upward/downward vection. The perceptual plausibility of the sound for the corresponding self-motion seemed an important factor of enhancing vection.

scholarly journals A Systematic Review on the Elicitation and Enhancement of Vection Through Tactile Stimulation

2021 ◽  
Author(s):  
Lars Kooijman ◽  
Houshyar Asadi ◽  
Shady Mohamed ◽  
Saeid Nahavandi
Keyword(s):  
Motion Sickness ◽  
Tactile Stimulation ◽  
A Priori ◽  
Visual Stimuli ◽  
Multimodal Interaction ◽  
Sensory Systems ◽  
Future Research ◽  
Illusory Perception ◽  
Definition Of ◽  
Self Motion

Vection is classically defined as the illusory perception of self-motion induced via visual stimuli. The utility of vection research lies in its potential to enhance simulation fidelity as measured through presence and reduce the probability that motion sickness symptoms occur through the identification of differences and similarities in physiological responses to vection and motion sickness. Recent studies have shown a multimodal interaction of various sensory systems in facilitating vection. Moreover, the utility of co-stimulating some of these sensory systems along with the presentation of visual stimuli have been reviewed. However, a review on the tactile mediation of vection appears to be missing from literature. The purpose of this review is to evaluate the current methodologies, and utility of, tactile stimulation in vection research. We searched for articles through EBSCOHost, Scopus and Web of Science. Only studies were included wherein an experiment on the effect of tactile stimulation on human self-motion perception was detailed. Twenty-three studies were obtained and distilled in tabular form. The studies reviewed presented a strong variability in the a-priori definition of vection, methodological inhomogeneity, varying approaches to the assessment of subjective vection measures and a lack of objective measures. We discuss the need for more qualitative research to reduce methodological inhomogenities, recommend future research in tactile-mediated vection to investigate stimulation to the torso, and suggest further investigation into the utility of concurrently presenting different forms of tactile stimulation.

scholarly journals Physiological Analysis of Self-motion Perception Induced by Visual Stimuli

2006 ◽  
Vol 60 (4) ◽  
pp. 589-596 ◽  
Author(s):  
Reiko Goto ◽  
Hiroaki Kudo ◽  
Kohei Sato ◽  
Norio Hotta ◽  
Koji Ishida ◽  
...  
Keyword(s):  
Motion Perception ◽  
Visual Stimuli ◽  
Physiological Analysis ◽  
Self Motion

Vection with Degraded Real-World Stimuli

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 293-293
Author(s):  
M Ohmi
Keyword(s):  
Real World ◽  
Dominant Role ◽  
Critical Role ◽  
Visual Stimuli ◽  
Vertical Motion ◽  
Spatial Quality ◽  
Psychophysical Studies ◽  
Self Motion ◽  
Temporal Degradation

Psychophysical studies have revealed that the retinal periphery plays a dominant role in inducing vection, ie the visually induced sensation of self-motion. This suggests that the quality of the visual stimulus is not an important factor for vection. However, since abstract stimuli were used in these studies, it is not clear whether the quality of real-world visual stimuli could still play a critical role in inducing vection. We investigated how vection induced by real-world visual stimuli was affected when the stimuli were spatially or temporally degraded. Stereoscopic video clips were taken through the windshield of a car driven on a sharply curved and hilly road. These clips were degraded spatially by using a mosaic effect, or temporally by using a strobe effect on a video editing system. The perceived direction and strength of vection were measured while subjects were viewing these visual stimuli presented on a 63 deg wide and 38 deg high video projection monitor. Degradation of the visual stimuli was found to have little effect on the assessment of direction in horizontal vection. Assessment of the direction of vertical vection, however, was significantly disturbed by both spatial and temporal degradation of the stimuli. Temporal degradation reduced the strength of vection significantly for both horizontal and vertical motion. In contrast, although spatial degradation of visual stimuli reduced the strength of vection in both dimensions slightly, the effect was not statistically significant. We conclude that the spatial quality of real-world visual stimuli does not play a significant role in inducing vection.

Perception of Accelerating Self-Motion: Global Optical Flow Rate Dominates Discontinuity Rate

1997 ◽  
Vol 41 (2) ◽  
pp. 1333-1337 ◽  
Author(s):  
Brian P. Dyre
Keyword(s):  
Optical Flow ◽  
Flow Rate ◽  
Visual Stimuli ◽  
Sources Of Information ◽  
Minor Influence ◽  
Primary Basis ◽  
A Minor ◽  
And Control ◽  
Self Motion

Owen, Wolpert, and Warren (1984) proposed that egospeed may be perceived from global optical flow rate, discontinuity rate, or both. Previous psychophysical research found that both sources of information influence judgments of acceleration and control of egospeed, but that discontinuity rate dominated. However, the validity of these results is questionable due to problems with the visual stimuli used, such as confounding of discontinuity rate with proximal flow rate and low frame rates. The current study examined the relative contributions of global optical flow rate and discontinuity rate to perception of accelerating self-motion with stimuli that lacked these problems. I found that global optical flow rate accounted for 60% of the variability in acceleration judgments, compared with 0.86% for discontinuity rate. This result indicates that discontinuity rate exerts only a minor influence, and global optical flow rate is the primary basis for perception of accelerating self-motion, and hence, egospeed.

scholarly journals Assessing the contribution of active somatosensory stimulation to self-acceleration perception in dynamic driving simulators

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259015
Author(s):  
Mattia Bruschetta ◽  
Ksander N. de Winkel ◽  
Enrico Mion ◽  
Paolo Pretto ◽  
Alessandro Beghi ◽  
...  
Keyword(s):  
Driving Simulator ◽  
Visual Stimuli ◽  
Integrated System ◽  
Driving Simulators ◽  
Somatosensory Stimulation ◽  
Simulation Fidelity ◽  
Platform Motion ◽  
Relative Contribution ◽  
Perceived Intensity ◽  
Self Motion

In dynamic driving simulators, the experience of operating a vehicle is reproduced by combining visual stimuli generated by graphical rendering with inertial stimuli generated by platform motion. Due to inherent limitations of the platform workspace, inertial stimulation is subject to shortcomings in the form of missing cues, false cues, and/or scaling errors, which negatively affect simulation fidelity. In the present study, we aim at quantifying the relative contribution of an active somatosensory stimulation to the perceived intensity of self-motion, relative to other sensory systems. Participants judged the intensity of longitudinal and lateral driving maneuvers in a dynamic driving simulator in passive driving conditions, with and without additional active somatosensory stimulation, as provided by an Active Seat (AS) and Active Belts (AB) integrated system (ASB). The results show that ASB enhances the perceived intensity of sustained decelerations, and increases the precision of acceleration perception overall. Our findings are consistent with models of perception, and indicate that active somatosensory stimulation can indeed be used to improve simulation fidelity.

scholarly journals Postural sway in the moving room scenario: New evidence for functional dissociation between self-motion perception and postural control

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257212
Author(s):  
Kentaro Horiuchi ◽  
Kuniyasu Imanaka ◽  
Masami Ishihara
Keyword(s):  
Visual Field ◽  
Postural Control ◽  
Optical Flow ◽  
Repeated Measures ◽  
Center Of Pressure ◽  
Visual Stimuli ◽  
Quiet Standing ◽  
Body Sway ◽  
Pendular Movement ◽  
Self Motion

Postural control in quiet standing is often explained by a reflexive response to optical flow, the apparent motion of environmental objects in a visual scene. However, moving room experiments show that even small-amplitude body sway can evoke odd sensations or motion sickness, indicating that a consciousness factor may also be involved. Studies targeting perception of self-motion, vection, typically use rapid visual stimuli moving in a single direction to maintain a constant feeling of vection, and there are few studies of vection using low-speed sinusoidal visual stimuli similar to human pendular movement. In the present study we searched for changes in postural control during periods of vection during quiet standing. Participants (N = 19, age = 20.4 ±1.1 years) were shown dynamic visual stimuli in the form of sinusoidally expanding and contracting random dots, and the stimuli speed and visual field were manipulated. Posture was continually evaluated using Center of Pressure (CoP) measurements. Participants were also asked to report feelings of vection, both by pressing a button during the trial and through an overall rating at the end of each trial. Using repeated-measures ANOVA, we assessed changes in the CoP and vection variables between experimental conditions, as well as possible interactions between the variables. The results show that postural reaction and vection were both affected by the visual stimuli and varied with speed. The peripheral visual field was found to couple to stronger feeling of vection and better quality of postural control. However, no significant relationship between postural control and vection, nor evidence of vection interaction to the relationship between optical flow and postural control, was found. Based on our results we conclude that for postural stability during quiet standing, visual cues dominate over any potential consciousness factor arising due to vection.

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