Some Recent Work on Auditory Adaptation and its Relationship to the Loudness Recruitment Phenomenon

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Abstract
An account is given of an exptl. study of certain loudness changes caused by adaptation of the hair cell responses to pure tone stimulation. Two outstanding characteristics of the adapted state are defined: "on-effect normality" and "relapse." Both resemble very closely those described by Matthews in the case of adaptation occurring in the muscle stretch receptors of the frog. Further studies in a number of human subjects show that both of these characteristics are exhibited regularly by the unadapted hair cell responses of individuals suffering from degenerative changes of the hair cells. These studies appear to establish a very close similarity between "on-effect normality" occurring in the case of the adapted normal sense organ and the phenomenon of loudness recruitment, as demonstrated by the alternate binaural loudness balance procedure of Fowler in the case of the unadapted but diseased sense organ. The exptl. findings are considered to favor the view that loudness recruitment is one element of a complex disturbance of cochlear function due to disease or injury of specific elements of the cochlear sensory apparatus, namely the hair cells of Corti''s organ.

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