Vestibular reactions during prolonged constant angular acceleration

Guedry, Fred E.; Lauver, L. S.

doi:10.1152/jappl.1961.16.2.215

Cited by 57 publications

(38 citation statements)

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“…The hallmark of adaptation is the reversal of the response when the stimulus is removed, and so this interpretation is compatible with the reversal of nystagmus and the re-emergence and reversal of perception of rotation upon removal from the magnetic field seen in the current study. Identical behaviour is seen upon termination of constant angular acceleration [8] and constant galvanic vestibular stimulation [11], [12]. It is expected that if stimulus duration is shortened so too is the amount of adaptation and the reversal of the response upon stimulus termination will be attenuated or abolished.…”

Section: Discusssionmentioning

confidence: 94%

“…Although, unlike nystagmus, perception of rotation did not last for the entire duration of magnetic field exposure, this discrepancy in persistence is not unexpected. Studies have shown that during constant angular acceleration, perception of rotation disappears over a time period of the order of one minute despite partly decayed, but continuing nystagmus [8]. This also occurs during constant galvanic vestibular stimulation [c.f., 11,12], another stimulus thought to be analogous to constant angular acceleration [12].…”

Section: Discusssionmentioning

confidence: 99%

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On the Vertigo Due to Static Magnetic Fields

Mian

Antunes

et al. 2013

PLoS ONE

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Vertigo is sometimes experienced in and around MRI scanners. Mechanisms involving stimulation of the vestibular system by movement in magnetic fields or magnetic field spatial gradients have been proposed. However, it was recently shown that vestibular-dependent ocular nystagmus is evoked when stationary in homogenous static magnetic fields. The proposed mechanism involves Lorentz forces acting on endolymph to deflect semicircular canal (SCC) cupulae. To investigate whether vertigo arises from a similar mechanism we recorded qualitative and quantitative aspects of vertigo and 2D eye movements from supine healthy adults (n = 25) deprived of vision while pushed into the 7T static field of an MRI scanner. Exposures were variable and included up to 135s stationary at 7T. Nystagmus was mainly horizontal, persisted during long-exposures with partial decline, and reversed upon withdrawal. The dominant vertiginous perception with the head facing up was rotation in the horizontal plane (85% incidence) with a consistent direction across participants. With the head turned 90 degrees in yaw the perception did not transform into equivalent vertical plane rotation, indicating a context-dependency of the perception. During long exposures, illusory rotation lasted on average 50 s, including 42 s whilst stationary at 7T. Upon withdrawal, perception re-emerged and reversed, lasting on average 30 s. Onset fields for nystagmus and perception were significantly correlated (p<.05). Although perception did not persist as long as nystagmus, this is a known feature of continuous SSC stimulation. These observations, and others in the paper, are compatible with magnetic-field evoked-vertigo and nystagmus sharing a common mechanism. With this interpretation, response decay and reversal upon withdrawal from the field, are due to adaptation to continuous vestibular input. Although the study does not entirely exclude the possibility of mechanisms involving transient vestibular stimulation during movement in and out of the bore, we argue these are less likely.

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Section: Discusssionmentioning

confidence: 94%

Section: Discusssionmentioning

confidence: 99%

On the Vertigo Due to Static Magnetic Fields

Mian

Antunes

et al. 2013

PLoS ONE

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“…Collins and Guedry [1962] found the value of A max, under states of arousal to be 30% higher than Guedry and Lauver [1961]. Short conversa tions consisting of simple questions which require some thought appeared to be the best way of preventing a decline in response [Kileny et al, 1980].…”

Section: Discussionmentioning

confidence: 92%

Gain of the Adaptation Mechanism in the Human Vestibulo-Ocular Reflex System

Boumans

Rodenburg²,

Maas³

1988

ORL

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The response of the vestibulo-ocular reflex to constant angular acceleration was investigated in healthy subjects using various stimulus amplitudes and stimulus durations. For stimulus amplitudes of 1.06 and 2.13°/s² the peracceleratory response maximum at 43 s was always followed by a decline in response. This decay was less pronounced for the longer stimulus duration suggesting a nonreturn to the zero baseline. From a comparison with the theoretical model it can be deduced that the gain of the adaptation mechanism is less than unity.

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“…Psychophysical data are qualitatively consistent with Figure 5.lc . Clark and Stewart (1968) and Guedry and Lauver (1961) used stimuli of the same magnitude (l.5°/sec 2) and found peak yaw rate perception at approximately 35 seconds and 24 seconds after stimulus onse t , respectively. The Ormsby model response to an identical stimulus is shown by Figure 5.2 and peaks abou t 27 secon ds af ter stimulus onse t. Th e response of Figure 5.lc is quite reasonable , although some adjustmen t of the input spectrum or noise/ si gnal ratio may be warran ted to create a sli ghtly slower response.…”

Section: Yaw Accelerationmentioning

confidence: 98%