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Original Article

Effect of Orientation to the Gravitational Vertical on Nystagmus Following Rotation About A Horizontal Axis

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Pages 517-526 | Received 15 Nov 1965, Published online: 08 Jul 2009
 

Abstract

Following clockwise rotation at 60°/sec about a horizontal cephalo-caudal axis the rate of decay of nystagmic eye movements, produced by an impulsive deceleration, was significantly greater than when the axis of rotation was vertical. The direction of the gravitational acceleration when normal to the axis of rotation had no consistent effect on the time constant of decay, though the angular velocity of nystagmus was greater in the 0° and 90° positions than at 180° and 270° and accounted for the larger nystagmus output in the former positions. Hypothetical mechanisms by which a linear acceleration may modify post-rotational responses are discussed.

Nach Rechtsdrehung von 60°/sec urn einc horizontalc cephalo-caudale Achse war die Abnahmerate nystagmischer Augenbcwegungen, hervorgerufen durch plötzliches Abbremsen, wesentlich grosser als nach Drehung um eine vertikale Achsc. Die Richtung der Gravitationsbeschleunigung im Winkel von 90° zur horizontalen Drehachse hatte keine bemerkenswerte Auswirkung auf die Zeitkonstante der Abnahme des Nystagmus, obgleicli die Winkelgeschwindigkeit in den Positionen von 0° und 90° grösser war als in den Positionen von 180° und 270°, weshalb sie für die grössere Gesamtamplitude des Nystagmus in den erstgenannten Stellungen verantwortlich zu machen ist. Es werden hypothetische Mechanismen besprochen, bei denen eine lineare Beschleunigung post-rotationale Reaktionen verändern kann.

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