Comparison of the effects of hearing aid harmonic distortion on performance scores for the MRHT and A PB--50/CM test.
The effects of two levels of hearing aid harmonic distortion (0.7 and 15.4%) on performance scores for the P-83 noise condition of the MRHT, and for a PB-50 word list embedded in a competing-message background (PB-50/CM) were compared with two groups each of 15 normal-hearing young adults. The effects of aided distortion were significantly greater for the PB-50/CM test indicating that the P-83 condition of the MRHT probably does not provide an acceptable standardized alternative to the use of an open-ended PB list in noise or in a competing message for which no standardized method exists.
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