Frequency Response of the Human Vestibulo-Ocular Reflex System at Low Frequencies: The Effect of Adaptation

Lj, Boumans; Rodenburg, M.; Aj, Maas

doi:10.1159/000275628

Cited by 4 publications

(5 citation statements)

References 11 publications

(13 reference statements)

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“…there is a notable difference from the theoretical decline of the response: after reaching the maximum value the peracceleratory response declines to a level where it seems to remain constant, suggest ing that the gain of the adaptation mechanism is less than unity. For this subject the value of T a determined from the response to sinusoidal oscilla tion was remarkably high, being 230 s [Boumans et al" 1983b]. This high value of Ta explains to some extent the high value of Aa after a stimulus of 140 s duration ( fig.…”

Section: Discussionmentioning

confidence: 63%

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Response of the Human Vestibulo-Ocular Reflex System to Constant Angular Acceleration

Boumans¹,

Rodenburg²,

Maas³

1983

ORL

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The vestibulo-ocular reflex (VOR) response to a constant angular acceleration was investigated in a small group of subjects by varying the stimulus amplitude and the stimulus duration. Various parameters of the response were determined and compared with the results of the theoretical study. This form of stimulation yields a rather high value for the adaptation time constant T_a, which perhaps indicates that there is an adaptation gain of less than unity. This supposition is supported by finding of non-linearity within the VOR system at high stimulus amplitudes.

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Section: Discussionmentioning

confidence: 63%

“…A technical description has been given elsewhere [Boumans et al, 1983b]. Data processing of all recordings was done by hand.…”

Section: Recording and Data Processingmentioning

confidence: 99%

Response of the Human Vestibulo-Ocular Reflex System to Constant Angular Acceleration

Boumans¹,

Rodenburg²,

Maas³

1983

ORL

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“…The data were obtained from the study by Bou mans et al [10], and since the experimental method has already been described in that paper, only the main points are outlined here. The experiments were carried out on a group o f 7 healthy subjects.…”

Section: Vor Measurementsmentioning

confidence: 99%

“…Ta has different values for nystagmus and for sensation. The effect of the adaptation mechanism on cupulometric data was quantitatively described by Bou mans et al [6,7], The addition of an adapta tion term to the second-order model of cupu lar behaviour theoretically results in consid erable changes in the frequency characteris tics in the low-frequency region [8]. The dif ferent values of Ta for VOR and for sensation should also lead to different frequency char acteristics.…”

Section: Introductionmentioning

confidence: 97%

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

Rodenburg¹,

Boumans²,

Maas³

1985

ORL

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The influence of adaptation on the phase characteristic of both the vestibular-ocular reflex and the sensation of rotation is investigated. The experimental data can be described by a second-order model with an adaptation term. The adaptation time constant T_a is found to be 135 s for the vestibulo-ocular reflex while it has a much lower value, 47 s, for the sensation of rotation. The difference is only found in the low-frequency region.

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Visual vestibular interaction: vestibulo-ocular reflex suppression with head-fixed target fixation

Gauthier

Vercher

1990

Exp Brain Res

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In order to maintain clear vision, the images on the retina must remain reasonably stable. Head movements are generally dealt with successfully by counterrotation of the eyes induced by the combined actions of the vestibulo-ocular reflex (VOR) and the opto-kinetic reflex. We have studied how, in humans, the VOR gain (VORG) is modulated to provide appropriate eye movements in two situations: 1. fixation of a stationary object of the visual space while the head moves. This requires a visuo-vestibulo-ocular reaction to induce eye movements opposite in direction, and equal in velocity to head movements, and 2. fixation of an object moving with the head. Here, the visuo-vestibulo-ocular reaction should be totally suppressed. These two situations were compared to a basic condition in which, to induce "pure" VOR, the subjects (Ss) in darkness were not allowed a visual target. Eye movements were recorded in seated Ss during constant amplitude sinusoidal and pulse-like passive rotations applied around the vertical axis. Subjects were in total darkness (DARK condition) and performing mental arithmetic. Alternatively, they were provided with a small target, either stationary with respect to earth (earth-fixed target: EFT), or moving with them (chair-fixed-target: CFT). The sinusoidal rotation experiment was used as baseline for the ensuing experiments and yielded control data in agreement with the literature. In particular, rotation in the dark showed a VORG of 0.6. With, for example, 0.8 s passive pulse rotations, typical responses in all three visual conditions were rigorously identical during the first 150 to 180 ms. They showed a delay of about 16 ms of the eye behind the head with no significant difference between passive whole-body and passive head-alone rotations. In all conditions, once the eyes had started to move, a rapid increase in eye velocity was observed during 75 to 80 ms, after which, the average VORG was 0.9 +/- 0.15. During the following 50 to 100 ms, the gain remained around 0.9 in all three conditions. Beyond 180 ms, the VORG remained around 0.9 in DARK, increased slowly towards 1 or decreased towards zero in the EFT and CFT conditions, respectively. The time-course of these later events suggests that visual tracking mechanisms came into play to reduce retinal slip through smooth pursuit. Sinusoidal rotations, extensively used in VOR studies, do not seem to be a satisfactory stimulus to rapidly and precisely characterize VOR function, particularly in pathological cases. Our data suggest that rapid transient rotations are more appropriate.

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Frequency Response of the Human Vestibulo-Ocular Reflex System at Low Frequencies: The Effect of Adaptation

Cited by 4 publications

References 11 publications

Response of the Human Vestibulo-Ocular Reflex System to Constant Angular Acceleration

Response of the Human Vestibulo-Ocular Reflex System to Constant Angular Acceleration

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

Visual vestibular interaction: vestibulo-ocular reflex suppression with head-fixed target fixation

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