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Latency-Intensity Functions in Detection of Cochlear and Retrocochlear Abnormality

Alfred C. Coats, MD

Arch Otolaryngol. 1978;104(12):709-717.

Abstract
• Latency-intensity (L-I) functions for (1) the auditory nerve action potential (AP) N₁ peak, (2) the brain stem evoked response (BER) V peak, and (3) the N₁-V interval were related to hearing level and lesion location. The AP L-I curves tended to steepen with increasing 4 to 8 kHz hearing level. This relationship was identical for cochlear and retrocochlear ears, except for a few retrocochlear ears with "inappropriate AP preservation." Both high-frequency cochlear loss and retrocochlear abnormality prolonged peak V latency, but retrocochlear abnormality generally prolonged it more. Among cochlear-loss ears, as 4 to 8 kHz hearing levels increased, N₁-V intervals decreased and L-I curve slopes increased. In contrast, retrocochlear abnormality greatly prolonged N₁-V intervals. As a retrocochlear sign, N₁-V prolongation was slightly more reliable than V prolongation.

(Arch Otolaryngol 104:709-717, 1978)

Author Affiliations
From the Departments of Otorhinolaryngology and Communicative Sciences and Neurology (Neurophysiology), Baylor College of Medicine, Houston.

Footnotes
Accepted for publication April 1, 1978.

Reprint requests to Institute of Otorhinolaryngology and Communicative Disorders, Neurosensory Center of Houston, 6501 Fannin St, Houston, TX 77030 (Dr Coats).

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