Noise Exposure and its Effects

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Abstract
Cochlear cell damage in the wake of broad-band noise stimulation has been found to be widespread throughout the length of the basilar membrane. This appears to be the case not only with experimental animals, but is also noted in post-mortem specimens of human ear tissues. The speculation is offered that pure-tone hearing tests do not fully depict the status of the cochlear end organ in that greater damage may exist than in apparent from the audiometric findings. It is suggested that signal-to-noise ratio test techniques provide informative supplementary evidence pertaining to the degree of cochlear destruction caused by noise exposure. Kokleær celleskade efter stimulation med bredbåndstøj er fundet spredt i hele basilarmem-branens långde – både hos forsøgsdyr og i sektionspræparater af humane ører. Den teori fremsættes, at det almindelige toneaudiogram ikke fuldt aftegner cochleas status, idet der kan eksistere større skade end audiometrifundene lader formode. Formentlig vil en prøveteknik med bestemmelse af diskriminationsevnen under varierende signallstøiforhold give supplerende oplysning med hensyn til graden af kokleær skade fordrsaget af støjexposition.

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