Saccades and the quick phase of nystagmus.

Abstract Quick phases of vestibular nystagmus and saccades were compared on the basis of the shape of their time courses and their amplitude-duration relationships in the alert intact monkey. Both rapid movements are almost identical when nystagmus is induced naturally by rotation. Visual field structure, illumination and darkness affect the speed of both types of movements similarly. This indicates that the same pre-motor neural circuit probably creates both saccades and quick phases. When nystagmus is created artificially (e.g. caloric or electrical stimulation) the quick phases are quite abnormal; their speed being reduced by a factor of two to three.

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