Abstract
Pure-tone masking patterns were obtained using equivalent sensation levels (SLs) of a 500-Hz masking tone in both normal hearing and cochlear impaired subjects. When the level of the masker was set at a relatively low intensity (35 dB SL), the two groups yielded equivalent threshold shifts at all of the masked frequencies (125–8000 Hz in octave increments). However, when the masker level was increased to 55 dB SL, it was found that those cochlear impaired subjects who exhibited particular audiometric criteria below 2000 Hz (e.g., 20 dB HL threshold at 500 Hz) generally showed greater threshold shifts at 1000 and 2000 Hz, while those impaired subjects not meeting these criteria yielded masking patterns that differed in no essential manner from the normals. These results were evaluated relative to those studies that have used narrow-band noise to investigate the spread of masking phenomena in normal and pathological ears.
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