Lesions Localized to the Eighth Nerve and Abnormal Threshold Adaptation

Abstract

A group of 5 patients was studied in each of whom a lesion was produced during a neurosurgical procedure in which damage was limited to the fibers of the eighth nerve. Preoperative and postoperative studies of ATA would indicate that in those patients the ATA was specifically related to the conductive function of the eighth nerve fibers. Other studies have shown that ATA can be produced by lesions of higher order neurons (see Parker et al., 1962, 1968). Extent of ATA in these lesions can be independent of threshold sensitivity and discrimination score.