Abstract
Eighteen adults ranging in age from 25 to 55 years and having a high‐frequency sensorineural hearing loss presumably due to noise exposure served as subjects in this study. Despite normal hearing thresholds (0–10 dB HL) from 500 through 2000 Hz in all subjects, some subjects in this study reliably exhibited abnormal performance on masking patterns obtained in the region of normal hearing (eg., 1000 Hz masker at 85 dB SPL). This same subgroup of subjects exhibited considerably poorer performance on word‐recognition tests administered in quiet and in noise. Measurement of hearing thresholds in the transition region of the hearing loss in the presence of low‐level low‐pass noise in some of the subjects in this subgroup suggests that the observed abnormality of masking patterns may be an indication of invalid hearing thresholds rather than abnormal “upward spread of masking.” [Work supported by the National Institute of Occupational Safety and Health.]
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