01987nas a2200205   4500008004100000022001400041245008200055210006900137260001200206300001200218490000600230520135500236653003701591100002401628700002201652700001901674700002001693700002101713856004701734       1984                        eng d  a0196-070900aPsychoacoustic and electrophysiologic effects of partial eighth nerve damage.0 aPsychoacoustic and electrophysiologic effects of partial eighth   c02/1984  a43–480 v53 aThe authors present psychoacoustic and electrophysiologic data concerning a patient with partial damage to the auditory nerve, presumably from a dilated arterial vessel. The lesion was described and documented during neurosurgery for vestibular nerve decompression. Pure tone thresholds, psychoacoustical tuning curves, speech reception ability for spondaic words, maximum word recognition performance for monosyllabic NU-6 word lists, and performance on the synthetic sentence identification test in the ipsilateral and contralateral competing message modalities were normal. Findings consistent with eighth nerve dysfunction, absent contralateral acoustic reflexes, absent or unrecognizable early evoked potentials occurring in the first 10 msec, brainstem auditory evoked potentials (BAEPs), and slight rollover of the performance intensity function for monosyllabic words were obtained on the involved side. In spite of the grossly abnormal BAEPs, two late, presumably cortical, auditory evoked potential components, which occur in the 60 to 250-msec range–vertex potential and T complex–were present and normal. The findings indicate that the perceptual processes needed for speech reception and recognition and for the appearance of later, presumably cortical-evoked potentials can be preserved despite partial damage to the auditory nerve.10aVestibulocochlear Nerve Diseases1 aCacace, Anthony, T.1 aGoldstein, J., C.1 aParnes, S., M.1 aSatya-Murti, S.1 aWolpaw, Jonathan  uhttp://www.ncbi.nlm.nih.gov/pubmed/6534193