Comparison of the Adaptation Time Constants of the Vestibulo-Ocular Reflex and of the Sensation of Rotation during Sinusoidal Stimulation

Rodenburg, M.; Boumans, L.J.J.M.; Maas, Alexander

doi:10.1159/000275762

Cited by 2 publications

(1 citation statement)

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“…It is obviously centralized in the brain as is shown by the difference between the value of the adaptation time constant for nystagmus and that for the sen sation of rotation [Stockwell et al, 1973;Rodenburg et al, 1985]. In animals the firstorder vestibular neurons show adaptation in between one third [Blanks et al, 1975] and two thirds of the units [Goldberg and Fer nandez, 1971;Precht et al, 1971], In the sec ond-order vestibular neurons of the cat the percentage of adapting units has been found to be still greater, up to about 80% [Babin et al, 1980].…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

Boumans

Rodenburg²,

Maas³

1988

ORL

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The Plasticity of Compensatory eye Movements in Rotatory Tests: 1.The effect of alertness and eye closure

Möller

Ödkvist

White

et al. 1990

Acta Oto-Laryngologica

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Fifteen voluntary subjects with a mean age of 26 years (17-39), participated in two rotatory experiments. The rotatory test used was sinusoidal harmonic acceleration (SHA) test at frequencies of 0.01-0.32 Hz. Compensatory eye movements were measured by means of EOG. Experiment A included rotation in darkness during alerting tasks (day 1), rotation in darkness with no tasks (day 2) and rotation in darkness during alerting tasks (day 3). In the alertness tests, the gain varied between 0.5 and 0.77. Phase values decreased with increasing frequency. The alertness results between days 1 and 3 did not differ in gain or phase. The gain of day 2 (no tasks) displayed significantly reduced gain at all frequencies, and a more pronounced decrease in phase than in the alertness tests. Experiment B comprised testing with eyes open (day 1) and eyes closed (day 2) during alerting tasks. These tests displayed significantly decreased gain at all frequencies with eyes closed compared with eyes open and with more negative phase at 0.08-0.32 Hz with eyes closed. The results indicate a central effect of the alertness level on compensatory eye movements, and the effect of eye closure might be explained by bio-mechanical and possibly even central effects on the eye movements. In low-frequency testing, as short a test time as possible should be used, and due to different alertness levels, the results should be evaluated with great caution.

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Comparison of the Adaptation Time Constants of the Vestibulo-Ocular Reflex and of the Sensation of Rotation during Sinusoidal Stimulation

Cited by 2 publications

References 12 publications

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

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

The Plasticity of Compensatory eye Movements in Rotatory Tests: 1.The effect of alertness and eye closure

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