Analysis of the Physical and Neurophysiological Principles, Underlying Vestibular Stimulation

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Abstract
At first, the time course of stimulus and that of excitation at the different levels of the peripheral and central vestibular system was studied comparatively, by sudden deflection and slow return of the cupula. Starting-point was the record of potential changes inside the hair-cell layer of the guinea pig''s cristae ampullares. When sudden, non-periodic mechanical events act as stimuli, the centers get a rather true image of the time course. This holds also for human beings. But the biological responses no longer correspond strictly if harmonic oscillations are applied. The amplitude and phase relations between stimulus and oculomotor responses were checked by pure sinusoidal retatory, optokinetic, proprioceptor, and electric stimulation, and the frequency characteristics were plotted and discussed.

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