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Some relations between auditory function and intracranial lesions with particular reference to lesions of the cerebellopontine angle were elicited by Goodman249 in a study of 18 patients on whom neurosurgical or neurologic data were available; these were compared with those for lesions of the cochlea. In cochlear disorders there is a discrimination loss for speech that is characteristically severe relative to a measured threshold loss for tones, but in intracranial lesions there is severe discrimination loss for speech that appears independent of the threshold loss for pure tones. The threshold loss will vary from normal sensitivity to severe loss (total loss of sensitivity for pure tones was excluded), whereas discrimination loss for speech will vary from severe to total. In intracranial lesions, severity of the discrimination loss for speech is not necessarily directly proportional to the severity of the threshold loss for tones.
PROCTOR B, Portmann M, Bozzi E, Szpunar J, Pick E. Chronic Progressive Deafness, Including Otosclerosis and Diseases of the Internal Ear: Summaries of the Bibliographic Material Available for 1957. Arch Otolaryngol. 1960;72(5):632–699. doi:10.1001/archotol.1960.00740010644010
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