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November 1969

Vestibular Accommodation Index: Clinical and Experimental Observations

Author Affiliations

Concepciön, Chile
From the Department of Otolaryngology, Clinical Hospital (Dr. DeLucci), and the Department of Physiology, School of Medicine, University of Concepción (Dr. Concha), Concepción, Chile.

Arch Otolaryngol. 1969;90(5):590-599. doi:10.1001/archotol.1969.00770030592012

ELECTRICAL stimulation of the ear began after the discovery of electric current, when in 1792 Volta1 reported a sensation of vertigo upon applying current to his head. Other investigators2-3 continued using electric current to stimulate the vestibular system until Brunings,4 in 1910, reported the difficulties and contradictions found by him and by earlier authors5-7 concerning the electrical stimulation of the vestibular apparatus remained. Since then this method has been considered as an auxilliary examination and of relatively little value.

In the present study, stimulating pulses were used in order to study vestibular excitability. Tissue excitability may be investigated by studying nervous accommodation. The accommodation is found by determining the excitation threshold, using exponentially increasing current obtained through RC circuits.

Figure 1 shows four exponentially increasing currents, where the RC values are 4, 20, 50, and 100 msec. As the RC value increases, the threshold rises, and

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