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https://www.readbyqxmd.com/read/27832269/stereoscopic-advantages-for-vection-induced-by-radial-circular-and-spiral-optic-flows
#1
Stephen Palmisano, Stephanie Summersby, Rodney G Davies, Juno Kim
Although observer motions project different patterns of optic flow to our left and right eyes, there has been surprisingly little research into potential stereoscopic contributions to self-motion perception. This study investigated whether visually induced illusory self-motion (i.e., vection) is influenced by the addition of consistent stereoscopic information to radial, circular, and spiral (i.e., combined radial + circular) patterns of optic flow. Stereoscopic vection advantages were found for radial and spiral (but not circular) flows when monocular motion signals were strong...
November 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/26965438/podokinetic-circular-vection-characteristics-and-interaction-with-optokinetic-circular-vection
#2
W Becker, K Kliegl, J Kassubek, R Jürgens
Stabilising horizontal body orientation in space without sight on a rotating platform by holding to a stationary structure and circular 'treadmill' stepping in the opposite direction can elicit an illusion of self-turning in space (Bles and Kapteyn in Agressologie 18:325-328, 1977). Because this illusion is analogous to the well-known illusion of optokinetic circular vection (oCV), we call it 'podokinetic circular vection' (pCV) here. Previous studies using eccentric stepping on a path tangential to the rotation found that pCV was always contraversive relative to platform rotation...
July 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/26358128/optokinetic-circular-vection-a-test-of-visual-vestibular-conflict-models-of-vection-nascensy
#3
R Jürgens, K Kliegl, J Kassubek, W Becker
The propensity to experience circular vection (the illusory perception of self-turning evoked by a rotating scene, CV) as reflected by its onset latency exhibits considerable interindividual variation. Models of CV nascensy have linked this delay to the time it takes the visual-vestibular conflict to disappear. One line of these "conflict models" (Zacharias and Young in Exp Brain Res 41:159-171, 1981) predicts that, across individuals, CV latency (CVL) correlates positively with the vestibular time constant (TC) and negatively with the vestibular motion detection threshold (vTHR)...
January 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/26321989/more-than-a-cool-illusion-functional-significance-of-self-motion-illusion-circular-vection-for-perspective-switches
#4
Bernhard E Riecke, Daniel Feuereissen, John J Rieser, Timothy P McNamara
Self-motion can facilitate perspective switches and "automatic spatial updating" and help reduce disorientation in applications like virtual reality (VR). However, providing physical motion through moving-base motion simulators or free-space walking areas comes with high cost and technical complexity. This study provides first evidence that merely experiencing an embodied illusion of self-motion ("circular vection") can provide similar behavioral benefits as actual self-motion: Blindfolded participants were asked to imagine facing new perspectives in a well-learned room, and point to previously learned objects...
2015: Frontiers in Psychology
https://www.readbyqxmd.com/read/25761342/can-walking-motions-improve-visually-induced-rotational-self-motion-illusions-in-virtual-reality
#5
Bernhard E Riecke, Jacob B Freiberg, Timofey Y Grechkin
Illusions of self-motion (vection) can provide compelling sensations of moving through virtual environments without the need for complex motion simulators or large tracked physical walking spaces. Here we explore the interaction between biomechanical cues (stepping along a rotating circular treadmill) and visual cues (viewing simulated self-rotation) for providing stationary users a compelling sensation of rotational self-motion (circular vection). When tested individually, biomechanical and visual cues were similarly effective in eliciting self-motion illusions...
2015: Journal of Vision
https://www.readbyqxmd.com/read/25520683/the-influence-of-imagery-vividness-on-cognitive-and-perceptual-cues-in-circular-auditorily-induced-vection
#6
Aleksander Väljamäe, Sara Sell
In the absence of other congruent multisensory motion cues, sound contribution to illusions of self-motion (vection) is relatively weak and often attributed to purely cognitive, top-down processes. The present study addressed the influence of cognitive and perceptual factors in the experience of circular, yaw auditorily-induced vection (AIV), focusing on participants imagery vividness scores. We used different rotating sound sources (acoustic landmark vs. movable types) and their filtered versions that provided different binaural cues (interaural time or level differences, ITD vs...
2014: Frontiers in Psychology
https://www.readbyqxmd.com/read/25511163/self-motion-sensitivity-to-visual-yaw-rotations-in-humans
#7
Alessandro Nesti, Karl A Beykirch, Paolo Pretto, Heinrich H Bülthoff
While moving through the environment, humans use vision to discriminate different self-motion intensities and to control their actions (e.g. maintaining balance or controlling a vehicle). How the intensity of visual stimuli affects self-motion perception is an open, yet important, question. In this study, we investigate the human ability to discriminate perceived velocities of visually induced illusory self-motion (vection) around the vertical (yaw) axis. Stimuli, generated using a projection screen (70 × 90 deg field of view), consist of a natural virtual environment (360 deg panoramic colour picture of a forest) rotating at constant velocity...
March 2015: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/23483823/visual-rotation-axis-and-body-position-relative-to-the-gravitational-direction-effects-on-circular-vection
#8
Shigehito Tanahashi, Hiroyasu Ujike, Kazuhiko Ukai
The visual-vestibular conflict theory asserts that visual-vestibular conflicts reduce vection and that vection strength is reduced with an increasing discrepancy between actual and expected vestibular activity. Most studies support this theory, although researchers have not always accepted them. To ascertain the conditions under which the theory of the visual-vestibular conflict can be applied, we measured circular vection strength accompanied by manipulation of the visual-otolith conflict by setting the axes of visual global motion (pitch, roll, and yaw) as either earth-horizontal or earth-vertical, using three different body positions (supine, left-lateral recumbent, and sitting upright)...
2012: I-Perception
https://www.readbyqxmd.com/read/22800430/ventral-and-dorsal-streams-processing-visual-motion-perception-fdg-pet-study
#9
Sandra Becker-Bense, Hans-Georg Buchholz, Peter zu Eulenburg, Christoph Best, Peter Bartenstein, Matthias Schreckenberger, Marianne Dieterich
BACKGROUND: Earlier functional imaging studies on visually induced self-motion perception (vection) disclosed a bilateral network of activations within primary and secondary visual cortex areas which was combined with signal decreases, i.e., deactivations, in multisensory vestibular cortex areas. This finding led to the concept of a reciprocal inhibitory interaction between the visual and vestibular systems. In order to define areas involved in special aspects of self-motion perception such as intensity and duration of the perceived circular vection (CV) or the amount of head tilt, correlation analyses of the regional cerebral glucose metabolism, rCGM (measured by fluorodeoxyglucose positron-emission tomography, FDG-PET) and these perceptual covariates were performed in 14 healthy volunteers...
July 16, 2012: BMC Neuroscience
https://www.readbyqxmd.com/read/21615257/application-of-zebrafish-oculomotor-behavior-to-model-human-disorders
#10
REVIEW
Colette M Maurer, Ying-Yu Huang, Stephan C F Neuhauss
To ensure high acuity vision, eye movements have to be controlled with astonishing precision by the oculomotor system. Many human diseases can lead to abnormal eye movements, typically of the involuntary oscillatory eye movements type called nystagmus. Such nystagmus can be congenital (infantile) or acquired later in life. Although the resulting eye movements are well characterized, there is only little information about the underlying etiology. This is in part owing to the lack of appropriate animal models...
2011: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/19542600/self-motion-perception-during-conflicting-visual-vestibular-acceleration
#11
Masayuki Ishida, Hiroaki Fushiki, Hiroshi Nishida, Yukio Watanabe
Self-motion is known to be falsely perceived during exposure to the movement of visual surroundings. This illusory perception of visually-induced self-motion is known as "vection." The present study was conducted to examine the relative strengths of vection versus whole-body angular acceleration as they determine perceived self-rotation under conditions in which they individually provide conflicting information. Each subject was rotated for 90 s about a vertical axis at a constant acceleration, and a large-field visual surround in front of the subject was simultaneously rotated at a constant acceleration in the same direction, but at a magnitude of acceleration twice that of the body...
2008: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/19189730/change-of-temporal-order-judgment-of-sounds-during-long-lasting-exposure-to-large-field-visual-motion
#12
Wataru Teramoto, Hiroshi Watanabe, Hiroyuki Umemura
The perceived temporal order of external successive events does not always follow their physical temporal order. We examined the contribution of self-motion mechanisms in the perception of temporal order in the auditory modality. We measured perceptual biases in the judgment of the temporal order of two short sounds presented successively, while participants experienced visually induced self-motion (yaw-axis circular vection) elicited by viewing long-lasting large-field visual motion. In experiment 1, a pair of white-noise patterns was presented to participants at various stimulus-onset asynchronies through headphones, while they experienced visually induced self-motion...
2008: Perception
https://www.readbyqxmd.com/read/17207289/sex-differences-in-judging-self-orientation-the-morphological-horizon-and-body-pitch
#13
COMPARATIVE STUDY
Luc Tremblay, Digby Elliott
BACKGROUND: Sex differences exist for many spatial tasks. This is true for circular vection, field dependence, and perception of veridical vertical with body tilt. However, explanations for these sex differences is lacking in the literature. In this study, we investigated the nature of individual differences in the perception of self-orientation in humans. Male and female participants were asked to identify their Morphological Horizon (i.e., line perpendicular to saggital plane at eye-level) in different body orientations relative to gravity (i...
2007: BMC Neuroscience
https://www.readbyqxmd.com/read/17081956/gender-and-race-as-determinants-of-nausea-induced-by-circular-vection
#14
Sibylle Klosterhalfen, Fang Pan, Sandra Kellermann, Paul Enck
BACKGROUND: Within- and between-subject variability of susceptibility for motion sickness is well established, but which factors determine susceptibility is less well known. OBJECTIVE: We investigated whether and to what degree sex, race, and head movements contribute to the development of nausea and vomiting (N&V) during pseudorotation in a vection drum in healthy participants. METHODS: Male and female, Chinese and white subjects were exposed to 5x1 minute of circular vection in a conventional rotation drum, with half of the participants performing nausea-enforcing head movements...
September 2006: Gender Medicine
https://www.readbyqxmd.com/read/16411116/perceptual-centering-effects-in-body-orientation
#15
D A Hanes
This study mathematically characterizes the results of DiZio and Lackner (Percept Psychphys 39(1): 39-46) on the perception of self-orientation during circular vection induced by an optokinetic stimulus. Using the hypothesis of perceptual centering, it is shown that five basic centering transformations can logically account for the full range of illusions reported by the subjects. All five of these transformations center the perceived orientations of body components, the rotating disk, and gravity : two align the perceived visual and inertial rotation axes, one centers the perceived axis of visual rotation in front of the head, and two straighten the perceived neck angle...
April 2006: Biological Cybernetics
https://www.readbyqxmd.com/read/15799576/influence-of-visually-induced-self-motion-on-postural-stability
#16
Hiroaki Fushiki, Kenji Kobayashi, Masatsugu Asai, Yukio Watanabe
CONCLUSION: Our results indicate that the illusion of self-motion is a significant factor leading to spatial disorientation. OBJECTIVE: Under normal circumstances, self-motion is perceived in response to motion of the head and body. However, under certain conditions, such as virtual reality environments, visually induced self-motion can be perceived even though the subject is not actually moving, a phenomenon known as "vection". The aim of this study was to examine the possible influence of illusory self-rotation (circular vection) on postural adjustments...
January 2005: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/15494552/selective-reversal-of-hyperglycemia-evoked-gastric-myoelectric-dysrhythmias-by-nitrergic-stimulation-in-healthy-humans
#17
Radoslav Coleski, Sutep Gonlachanvit, Chung Owyang, William L Hasler
Acute hyperglycemia disrupts gastric myoelectric rhythm in healthy humans. Defective nitrergic function is a factor in animal models of diabetic gastropathy. We tested participation of nitrergic pathways in hyperglycemia-evoked myoelectric dysrhythmias and compared their role in preventing dysrhythmic actions of experimental motion sickness. Twelve healthy volunteers underwent electrogastrography (EGG) with and without intravenous 20% dextrose to produce plasma glucoses of 250 mg/dl. EGG continued for 2 h after oral nitroglycerin (9 mg) or the cyclic GMP-specific phosphodiesterase inhibitor sildenafil (100 mg)...
January 2005: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/15372130/the-visual-control-of-stability-in-children-and-adults-postural-readjustments-in-a-ground-optical-flow
#18
COMPARATIVE STUDY
Bernard Baumberger, Brice Isableu, Michelangelo Flückiger
The aim of this research was to analyse the development of postural reactions to approaching (AOF) and receding (ROF) ground rectilinear optical flows. Optical flows were shaped by a pattern of circular spots of light projected on the ground surface by a texture flow generator. The geometrical structure of the projected scenes corresponded to the spatial organisation of visual flows encountered in open outdoor settings. Postural readjustments of 56 children, ranging from 7 to 11 years old, and 12 adults were recorded by the changes of the centre of foot pressure (CoP) on a force platform during 44-s exposures to the moving texture...
November 2004: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/12740727/vestibular-optokinetic-and-cognitive-contribution-to-the-guidance-of-passive-self-rotation-toward-instructed-targets
#19
Reinhart Jürgens, Grigorios Nasios, Wolfgang Becker
We ask how vestibular and optokinetic information is combined ("fused") when human subjects who are being passively rotated while viewing a stationary optokinetic pattern try to tell when they have reached a previously instructed angular displacement ("targeting task"). Inevitably such a task entices subjects to also draw on cognitive mechanisms such as past experience and contextual expectations. Specifically, because we used rotations of constant angular velocity, we suspected that they would resort, consciously or unconsciously, to extrapolation strategies even though they had no explicit knowledge of this fact...
July 2003: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/12688448/optokinetic-drum-tilt-hastens-the-onset-of-vection-induced-motion-sickness
#20
Andrea Bubka, Frederick Bonato
BACKGROUND: Under optokinetic drum conditions, a stationary participant views the patterned interior of a rotating drum. Quickly, most participants perceive illusory self-rotation in the direction opposite to the drum's true rotation (vection). It has been documented that up to 60% of participants experience motion sickness-like symptoms under optokinetic conditions perhaps because of conflicting sensory information from the visual and vestibular systems. METHODS: Keeping rotation speed constant (10 RPM), drum tilt relative to the axis of rotation was systematically manipulated (0 degrees, 5 degrees, 10 degrees), producing a wobble effect...
April 2003: Aviation, Space, and Environmental Medicine
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