Permanent Threshold Shift Associated With Overamplification by Hearing Aids Humes and Jesteadt have proposed that the Modified Power Law (MPL) provides a means of predicting permanent threshold shift (PTS) due to noise exposure in subjects with preexisting sensorineural hearing loss. Data concerning PTS attributed to overamplification by hearing aids in 8 children with severe sensorineural hearing loss were used ... Research Article
Research Article  |   April 01, 1991
Permanent Threshold Shift Associated With Overamplification by Hearing Aids
 
Author Affiliations & Notes
  • John H. Macrae
    National Acoustic Laboratories Chatswood, Australia
  • Requests for reprints should be sent to John Macrae, Ph.D. National Acoustic Laboratories, 126 Greville Street, Chatswood NSW 2067, Australia.
Article Information
Hearing / Research Articles
Research Article   |   April 01, 1991
Permanent Threshold Shift Associated With Overamplification by Hearing Aids
Journal of Speech, Language, and Hearing Research, April 1991, Vol. 34, 403-414. doi:10.1044/jshr.3402.403
History: Received March 6, 1990 , Accepted July 12, 1990
 
Journal of Speech, Language, and Hearing Research, April 1991, Vol. 34, 403-414. doi:10.1044/jshr.3402.403
History: Received March 6, 1990; Accepted July 12, 1990

Humes and Jesteadt have proposed that the Modified Power Law (MPL) provides a means of predicting permanent threshold shift (PTS) due to noise exposure in subjects with preexisting sensorineural hearing loss. Data concerning PTS attributed to overamplification by hearing aids in 8 children with severe sensorineural hearing loss were used to evaluate the MPL hypothesis. The excessive amplification was partly due to use by the children of very high volume-control settings instead of mid-range volume-control settings. The PTS tended to be flat across frequency. Its course in time was a miniature version of the time course of PTS that would be induced by a similar noise exposure in a person with normal hearing. It began to occur soon after the start of hearing aid use and its rate of development was slower than that which would occur in a person with normal hearing. The growth of PTS could be predicted from the estimated real ear output levels of the children’s hearing aids by means of the MPL combined with the logarithmic equation proposed by Kraak for predicting the effect of noise exposure on hearing.

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