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NEUROLOGY 1985;35:983
© 1985 American Academy of Neurology

Release from central auditory competition in the split-brain patient

Frank E. Musiek, PhD, Alexander G. Reeves, MD and Jane A. Baran, PhD

Sections of Otolaryngology and Audiology (Dr. Musiek) and Audiology (Dr. Baran), Department of Surgery, and the Section of Neurdogy, Department of Medicine (Dr. Reeves), Dartmouth-Hitchcock Medical Center, Hanover, NH; and the Department of Communication Disorders (Dr. Baran), University of Massachusetts, Amherst, MA.

We used dichotic digits (DD), staggered spondaic words (SSW), and frequency patterns (PATT) to study central auditory function before and after two-stage callosotomy. Preoperatively, the patient demonstrated reduced scores bilaterally on all these tests, consistent with documented bilateral hemisphere lesions. After the first operation (sectioning the posterior half of the corpus callosum), the dichotic tests (DD and SSW) revealed the expected decrease in left-ear scores, but there was improvement on the right, perhaps because there was release from central auditory competition. Our findings also suggest that the "auditory" portion of the corpus callosum may be in the posterior half of this structure.

Address correspondence and reprint requests to Dr. Musiek, Dartmouth-Hitchcock Medical Center, 2 Maynard Street, Hanover, NH 03756.

Accepted for publication October 23, 1984.




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