Nystagmus Responses during Rotation about a Tilted Axis,

Stockwell, Charles W.; Turnipseed, Gene T.; Guedry, Fred E.

doi:10.21236/ad0726172

1971

DOI: 10.21236/ad0726172

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Nystagmus Responses during Rotation about a Tilted Axis,

Charles W. Stockwell¹,

Gene T. Turnipseed²,

Fred E. Guedry³

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Cited by 10 publications

(1 citation statement)

References 16 publications

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“…A) SCY data. B) Rotational chair velocity(8).140 sec at Harvard Libraries on July 20, 2015 aor.sagepub.com Downloaded from…”

mentioning

confidence: 99%

Off-Vertical Axis Rotation: A Test of the Otolith-Ocular Reflex

Furman¹,

Schor²,

Schumann³

1992

Ann Otol Rhinol Laryngol

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The vestibulo-ocular reflex was studied via off-vertical axis rotation (OVAR) in the dark. The axis of the turntable could be tilted from vertical by up to 30 degrees. Eye movements were measured with electro-oculography. Results from healthy asymptomatic subjects indicated that 1) a reliable otolith-induced response could be obtained during constant velocity OVAR using a velocity of 60 degrees/s with a tilt of 30 degrees; 2) constant velocity OVAR rotation was nausea-producing and, especially if subjects were rotated in the dark about an earth-vertical axis prior to being tilted, disorienting; and 3) sinusoidal OVAR produced minimal nausea; the eye movement response appeared to be the result of a combination of semicircular canal and otolith components. We conclude that OVAR has the potential of becoming a useful method for clinically assessing both the otolith-ocular reflex and semicircular canal-otolith interaction.

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“…A) SCY data. B) Rotational chair velocity(8).140 sec at Harvard Libraries on July 20, 2015 aor.sagepub.com Downloaded from…”

mentioning

confidence: 99%

Off-Vertical Axis Rotation: A Test of the Otolith-Ocular Reflex

Furman¹,

Schor²,

Schumann³

1992

Ann Otol Rhinol Laryngol

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Otolith—Ocular responses in familial episodic ataxia linked to chromosome 19p

Furman

1997

Annals of Neurology

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We evaluated several members of a family with episodic ataxia type 2 linked to chromosome 19p by using a battery of vestibulo-ocular reflex (VOR) tests. Testing focused on the otolith-ocular reflex and semicircular canal-otolith interaction. Our aims were to improve understanding of the structures important for the VOR and to define further the range of vestibulo-ocular, in particular otolith-ocular, manifestations within a family with episodic ataxia. Ocular motor, semicircular canal-ocular, and semicircular canal-otolith interaction assessments suggested impairment of the vestibulo-cerebellum (ie, the flocculonodular lobe); the brainstem appeared to be relatively spared. Eye movements during constant velocity off-vertical axis rotation (OVAR), a pure otolith stimulus, indicated that the modulation component of the response was normal whereas the bias component was reduced or nearly absent. Based on these data, it appears that the cerebellum is not responsible for the generation of the modulation component of the response to OVAR. However, the bias component appears to depend on the caudal midline cerebellum.

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Nystagmus induced by off-vertical rotation axis in the cat

1988

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1) In the alert cat, nystagmus induced by off-vertical axis rotation (OVAR) was recorded following steps in head velocity or ramps of velocity at constant acceleration below canal threshold. Dependence of nystagmus characteristics on tilt angle of rotation axis and head velocity was studied. Similar results were obtained with both types of stimulation. 2) Mean and modulation amplitude of horizontal eye velocity increased with tilt angle in the range 0-30 degrees. 3) Both variables increased also with head velocity, but with different trends, probably because they are set by different mechanisms. When head rotational velocity was increased above 80 degrees/s, mean eye velocity progressively decreased to zero. 4) In spite of variations from one animal to another, some regularity was observed in the phase of eye velocity modulation. In several cases, a reduction in phase lead of eye velocity with respect to conventional origin of phases (nose-down position) was observed when head velocity increased. 5) Time constant of post-OVAR nystagmus decreased with the tilt angle of the rotation axis from gravity, but not with the orientation of the head with respect to rotation axis. 6) The results could be accounted for by a general equation describing the vestibulo-ocular reflex, provided that estimates of kinematic variables of head movement (head rotational and translational velocities), and visual target distance could be computed by the Central Nervous System.

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Nystagmus Responses during Rotation about a Tilted Axis,

Cited by 10 publications

References 16 publications

Off-Vertical Axis Rotation: A Test of the Otolith-Ocular Reflex

Off-Vertical Axis Rotation: A Test of the Otolith-Ocular Reflex

Otolith—Ocular responses in familial episodic ataxia linked to chromosome 19p

Nystagmus induced by off-vertical rotation axis in the cat

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