C Wennmo

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The peak velocities of saccades and fast phases of nystagmus were examined and compared in 20 healthy subjects. The peak velocities of both types of eye movements increased with increase of amplitudes. The saccades were found to be fastest in light, slower in darkness and slowest behind closed eyelids. The peak velocities of the quick phases of optokinetic(More)
Thirty patients, primarily diagnosed as having vestibular neuronitis, were investigated with a test battery consisting of neuro-otological, neuro-ophthalmological, neurological examinations and electro-oculography. Initial routine examination failed to reveal involvement of structures outside the vestibular nerve, whereas neurological evaluation and(More)
We report a quantitative analysis of eye movement disturbances in patients with isolated cerebellar disorders and patients with cerebellar disorders and concomitant brainstem involvement. The most characteristic abnormalities in the exclusively cerebellar patients were increased velocities of the slow phases of vestibular nystagmus induced by rotation in(More)
Vertigo is a common symptom after head injuries, though often overlooked in the acute stage due to other concomitant manifestations. According to previous investigations the mechanisms of injury to the vestibular system cannot be defined as clearly as for the auditory system. Twenty patients with temporal bone fractures were reviewed and later re-examined.(More)
The maximum velocity gain of smooth pursuit and optokinetic, vestibular, and optovestibular slow phases was examined in 15 patients with pontine, 10 with medullary, 10 with cerebellar, and 5 with combined cerebello-brain stem disorders. Marked dissociations were observed between smooth pursuit and optokinetic slow phases, especially in medullary disease. A(More)
Five patients with a disturbance of their preprogramming of speech (dyspraxia of speech) were exposed to a comprehensive eye-motor test-battery. The saccades were found hypometric and inaccurate with irregular intervening pauses. The finding was interpreted as due to an extension of lesions from frontal cortical speech areas into visual motor cortex(More)
  • C Wennmo
  • 1988
Quantitative studies of vertical saccades are sparse, due to a lack of reliable recording techniques. In this study, electro-oculographic (EOG) and photo-electronystagmographic (PENG) techniques showed that up-directed saccades were faster than down-directed ones. In the EOG recording, however, the velocity of the up-directed saccade was correlated to the(More)
The number of saccades, vestibular gain and visual suppression as a function of smooth pursuit gain were determined in 10 cerebellar cases. Visual suppression increased and the number of saccades decreased with increasing smooth pursuit gain while a high vestibular gain was found in most cases but without relation to the gain of smooth pursuit. An eye-motor(More)
Mean peak velocity and accuracy of vertical saccades were measured in 15 patients with disorders in the brain stem and in 12 normal subjects. (1) In the normal group up-directed saccades were faster than down-directed and the velocity of the saccade was not dependent on the age of the subject. Up-saccades were faster whether electro-oculography or(More)