Vitamin A deficiency and its relation to hearing.

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Abstract
Rabbits were used to discover in what way a vit. A-free diet would affect the auditory mechanism of a young animal. Behavioral responses and electrical responses of the cochlea and auditory nerve were used to test the auditory impairment. These measurements were followed by a histological examination to determine the extent of anatomical change. Behavioral responses gave no evidence of a loss of hearing. The electrical responses of the cochlea showed no difference between normal animals and those deficient in vit. A. The range of response for both intensity and frequency remained the same. Records of nerve activity as observed at the round window appeared the same for both exptl. and control animals. No anatomical changes were produced in the cochleas of the animals except for a moderate degree of serous labyrinthitis.