Trends In Amplification
نویسنده
چکیده
The aided threshold (and functional gain) has been used as a behavioral verification tool since the early 1960s to document the improvement in hearing sensitivity with hearing aid use. Clinicians judge the adequacy of amplification by examining if the aided threshold reaches a prescribed target value. The functional gain provided by the hearing aids, or the difference in audiometer dial readings between the unaided and the aided thresholds, was suggested to reflect gain for sounds presented at a conversational input level (Pascoe, 1975). The measurement of functional gain is needed because the coupler gain of a hearing aid is different from the gain that the wearer receives when it is worn. With the advent of probe microphone real-ear measurement (REM), the value of the behaviorally aided threshold measure is questioned (eg, Stelmachowicz et al., 2002). There may be many reasons for this change in practice. REM is an “objective” measure capable of reflecting the gain/output at different input
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