### ASA 125th Meeting Ottawa 1993 May

## 4aPP12. Equal sensation functions in bilateral sensorineural-impaired
hearing.

**Rhona P. Hellman
**

**
Carol H. Meiselman
**

**
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*Auditory Perception Lab., Northeastern Univ., 360 Huntington Ave., Boston,
MA 02115
*

*
*
Equal sensation functions were generated for individuals and groups with
hearing losses ranging from 39 to 73 dB at the stimulus frequency. The
functions were obtained directly from conventional loudness matching, and
indirectly from magnitude estimation, magnitude production, and cross-modality
matching. The results of the direct and indirect loudness-level determinations
lie within a relatively narrow band. On the average, the intrasubject
variability across procedures ranges from 4 to 6 dB. The corresponding
intersubject variability has a mean value of 4.6 dB. Moreover, cross-modality
matches obtained for 36 listeners exhibit temporal stability for intersession
intervals as long as 5 years. Loudness functions constructed from the data are
better described by Zwislocki's [Handbook of Mathematical Psychology, 3--97
(1965)] proposed loudness equation than by either of the more widely applied
power-law modifications. [Work supported by the Rehab R&D Service of the VA and
by NIH.]