Vertical frames of reference and control of body orientation

Carriot, Jérôme; DiZio, Paul; Nougier, Vincent

doi:10.1016/j.neucli.2008.09.003

Cited by 28 publications

(19 citation statements)

References 113 publications

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“…This minimal effect could reflect either the RF or heating effects of the generic mobile, with ensuing stimulation of the vestibular labyrinth or nerve [Lebovitz, 1973;Rothman et al, 1996]. Alternatively, this could be due to effects of a minor head tilt due to the weight of the generic device, [Hoppenbrouwers et al, 2004;Carriot et al, 2008] or proprioceptive stimulation of neck muscle spindles due to the lateral shift of the center of mass of the head [Wetzig and von Baumgarten, 1990;McKenna et al, 2004].…”

Section: Discussionmentioning

confidence: 99%

“…As in the true exposure experiments, an ear effect was noted with the right ear condition resulting in the SVV and SVH being displaced more to the left than on baseline, while the left ear resulted in the SVV and SVH being displaced more to the right than on the baseline. Thus, the effects of mobile phone exposure on the SVV/SVH observed in the true exposure experiment I are more likely to reflect the effect of a minor head tilt due to the weight of the generic device, that is, the so‐called Muller or “E‐effect” [Hoppenbrouwers et al, ; Carriot et al, ], which results in deviation of the SVV opposite to the head tilt. This has been attributed to a reduced otolith sensitivity in the roll‐tilt position [Markham, ], or to enhanced visual pattern recognition by the visual cortex for cardinal planes of the head overriding the utricular information during head tilt [Hoppenbrouwers et al, ].…”

Section: Methodsmentioning

confidence: 99%

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Mobile telephone use effects on perception of verticality

Bamiou

Ćeranić

Vickers

et al. 2014

Bioelectromagnetics

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Low-level radiofrequency (RF) signals may produce disorientation and nausea. In experiment I, we assessed mobile phone effects on graviception in nine symptomatic subjects after mobile telephone use and 21 controls. The mobile handset was strapped to each ear for 30 min in pulsed emission, continuous RF emission, or no emission test mode, respectively. The subjective visual vertical and horizontal (SVV/SVH) were tested from min 25 of exposure. There was no exposure effect; however, there was an ear effect, with the SVV/SVH being shifted to the opposite direction of the ear exposed. This could be due to thermal or RF effects or handset weight. In experiment II, we assessed the handset weight effect on 18 normal controls. After baseline SVV/SVH, the switched off handset was strapped to either ear; the SVV/SVH was repeated 25 min later. A significant ear effect was found. We compared the observed ear effect SVV/SVH change in the experiment II group to the continuous exposure ear effect change in the experiment I group, and the difference was not significant. The ear effect was attributed to a minor head tilt due to the handset weight, or proprioceptive stimulation of neck muscle affecting the perception of verticality.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Mobile telephone use effects on perception of verticality

Bamiou

Ćeranić

Vickers

et al. 2014

Bioelectromagnetics

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“…According to the previous explanation, geocentric judgements would be attracted towards the whole Z-body axis, regardless of the perception of tilt (Carriot, DiZio, & Nougier, 2008). This whole-body attraction has been reported more or less important, however, depending on the dimension of body tilt (roll vs. pitch;Ebenholtz, 1970) or the direction to be estimated (vertical vs. horizontal;Betts & Curthoys, 1998;Carriot et al, 2008;Lejeune, Thouvarecq, Anderson, Caston, & Jouen, 2009). Alternatively, the Z-trunk axis and the Z-head axis were also shown to constitute relevant egocentric references influencing the perception of earthbased directions (Guerraz, Poquin, Luyat, & Ohlmann, 1998;Wade, 1969Wade, , 1970Wetzig & Baumgarten, 1990).…”

Section: Introductionmentioning

confidence: 92%

“…This hypothesis considers that the longitudinal Z-body axis could serve as a strong reference in estimating some relevant earth-based directions such as the subjective visual vertical and the SVH. According to the previous explanation, geocentric judgements would be attracted towards the whole Z-body axis, regardless of the perception of tilt (Carriot, DiZio, & Nougier, 2008). This whole-body attraction has been reported more or less important, however, depending on the dimension of body tilt (roll vs. pitch;Ebenholtz, 1970) or the direction to be estimated (vertical vs. horizontal;Betts & Curthoys, 1998;Carriot et al, 2008;Lejeune, Thouvarecq, Anderson, Caston, & Jouen, 2009).…”

Section: Introductionmentioning

confidence: 95%

Postural configuration affects the perception of earth-based space during pitch tilt

2011

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This study investigates the relative contribution of body parts in the elaboration of a whole-body egocentric attraction phenomenon previously observed during earth-based judgments. This was addressed through a particular earth-based task requiring estimating the possibility of passing under a projected line, imagining a forward horizontal displacement. Different postural configurations were tested, involving whole-body tilt, trunk tilt alone or head tilt alone. Two legs positions relative to the trunk were manipulated. Results showed systematic deviations of the subjective "passability" toward the tilt, linearly related to the tilt magnitude. For each postural configuration, the egocentric influence appeared to be highly dependent on the position of trunk and head axes, whereas the legs position appeared not relevant. When compared to the whole-body tilt condition, tilting the trunk alone consistently reduced the amount of the deviation toward the tilt, whereas tilting the head alone consistently increased it. Our results suggest that several specific effects from multiple body parts can account for the global deviation of the estimates observed during whole-body tilt. Most importantly, we support that the relative contribution of the body segments could mainly depend on a reweighting process, probably based on the reliability of sensory information available for a particular postural set.

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“…An accurate internal estimate of the direction of gravity is essential to staying upright, navigating in and interacting with the environment(see [8] for review). Besides vision and proprioception (skin pressure sensors, joint sensors, visceral body sensors, muscle spindles), the labyrinthine otolith organs provide key information about the direction of the pull of gravity [33,42].…”

Section: Introductionmentioning

confidence: 99%

Temporal constancy of perceived direction of gravity assessed by visual line adjustments

Tarnutzer

Fernando

Kheradmand

et al. 2012

VES

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Here we investigated how well internal estimates of direction of gravity are preserved over time and if the subjective visual vertical (SVV) and horizontal (SVH) can be used inter-changeably. Fourteen human subjects repetitively aligned a luminous line to SVV, SVH or subjective visual oblique (± 45Âř) over 5 min in otherwise complete darkness and also in dim light. Both accuracy (i.e., the degree of veracity as reflected by the median adjustment error) and precision (i.e., the degree of reproducability as reflected by the trial-to-trial variability) of adjustments along the principle axes were significantly higher than along the oblique axes. Orthogonality was only preserved in a minority of subjects. Adjustments were significantly different between SVV vs. SVH (7/14 subjects) and between ±45Âř vs. −45Âř (12/14) in darkness and in 6/14 and 14/14 subjects, respectively, in dim light. In darkness, significant drifts over 5min were observed in a majority of trials (33/56). Both accuracy and precision were higher if more time was taken to make the adjustment. These results introduce important caveats when interpreting studies related to graviception. The test re-test reliability of SVV and SVH can be influenced by drift of the internal estimate of gravity. Based on spectral density analysis we found a noise pattern consistent with 1/ f & b e t a ; noise, indicating that at least part of the trial-to-trial dynamics observed in our experiments is due to the dependence of the serial adjustments over time. Furthermore, using results from the SVV and SVH inter-changeably may be misleading as many subjects do not show orthogonality. The poor fidelity of perceived ± 45Âř indicates that the brain has limited ability to estimate oblique angles.

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Vertical frames of reference and control of body orientation

Cited by 28 publications

References 113 publications

Mobile telephone use effects on perception of verticality

Mobile telephone use effects on perception of verticality

Postural configuration affects the perception of earth-based space during pitch tilt

Temporal constancy of perceived direction of gravity assessed by visual line adjustments

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