Dr. Robert Tait McKenzie: a man for all seasons.
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Canada↗
Biomedical subjects
S A Davidson
Publications and source records attributed to S A Davidson.
A clinically feasible method for determining frequency resolution.
Psychophysical tuning curves were generated by normally hearing and hearing-impaired subjects using two methods; a detailed laboratory method and a Bekesy method proposed as suitable for clinical use. The two methods were compared for stability, the amount of masking produced and the pattern of the masking functions. The two measures of frequency resolution were found to be equally reliable and showed the same range of repeatability as simple pure tone thresholds. The patterns of the masking functions were similar regardless of the method used. However, the absolute amounts of masking indicated with each method were significantly different, with more masking obtained when the clinical method was used.
Adult↗
Hearing aid selection for the elderly: consideration of central aging effects.
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Aged↗
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↗