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July 1972

Central Auditory Deficits After Temporal Lobectomy

Author Affiliations

New Orleans
From the departments of physiology (Dr. Berlin), otorhinolaryngology (Drs. Berlin and Lowe-Bell), and the Division of Neurosurgery, department of surgery (Drs. Jannetta and Kline), Louisiana State University School of Medicine, Kresge Hearing Research Laboratory of the South, New Orleans. Dr. Jannetta is currently at the University of Pittsburgh School of Medicine.

Arch Otolaryngol. 1972;96(1):4-10. doi:10.1001/archotol.1972.00770090042003

Dichotic simultaneous and time-staggered speech perception data from four patients with temporal lobectomies are compared to results from over 100 normals. In these tests, two different nonsense syllables are given in competition, one to each ear. The syllables are presented simultaneously, then with time separations ranging from 15 to 500 msec. With simultaneous onset, normals showed right ear superiority; with time separations of 30 to 90 msec, normals showed a "lag effect," ie, better scores for the trailing stimulus. In sharp contrast, temporal lobectomy patients showed poorer contralateral ear function than ipsilateral ear function, and no lag effect. Comparing preoperative and postoperative scores, we see that postoperatively there is additional degradation of contralateral ear scores and enhanced ipsilateral ear function in dichotic listening. Patients with both left and right temporal lobectomies behaved similarly in this respect.

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