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Biomedical subjects

C W Stockwell

Publications and source records attributed to C W Stockwell.

24 records · Page 2Linked to original sources
PubMedDate not supplied

Computer simulation of fixation suppression of vestibular nystagmus in normal persons.

Fixation suppression of vestibular nystagmus was tested in normal humans during passive, nonperiodic angular rotation. The eye movement responses of the subjects were simulated using a simple mathematical model of visual-vestibular interaction. Agreement between observed and simulated responses was reasonably close, indicating that the model is a realistic representation of the physiologic mechanisms involved. The model was then used to assess the relative contributions of the pursuit and optokinetic systems to fixation suppression. It showed that, under these testing conditions, fixation suppression is mediated almost entirely by the pursuit system.

Acoustic Stimulation↗
PubMedDate not supplied

A method for evaluating vestibular control of posture.

Tests that measure the patient's ability to control his posture generally have failed to yield clinically useful information about vestibular function. The primary reason for this failure is that postural control does not depend on vestibular function when visual and proprioceptive cues are available. To test vestibular function, one should use a procedure that forces the patient to rely on vestibular cues by eliminating cues from these other sensory systems. Such a procedure is described. Vision is eliminated by eye closure, and proprioceptive cues are minimized by rotating the supporting surface to null changes in ankle angle. Data are presented which show that postural responses are complex, but that they appear to conform to the pattern originally observed by Nashner. A method potentially capable of separately evaluating semicircular canal and otolith function is described.

Ankle Joint↗
PubMedDate not supplied

Posturography.

Posturography is a method of measuring a patient's ability to control his balance. Currently available testing techniques may be useful to otologists, although they have not been shown to yield information beyond that obtained from other diagnostic procedures. More powerful techniques are under development, but methodologic problems remain, and none is yet ready for routine clinical use.

Cerebellum↗