The Effects of Sensorineural Hearing Impairment on Asynchronous Glimpsing of Speech
Fig 4
Masking release relative to unmodulated noise.
Mean masking release is plotted for modulated noise conditions relative to the unmodulated condition for hearing-impaired (HI; left panel) normal controls with stimulus presentation at either the same intensity (NH; middle panel) or same sensation level (NHSL; right panel). The difference in mean thresholds relative to the Unmod-M condition at 2, 4, 8, and 16 bands are plotted for the monaural asynchronous condition (Async-M; circles), the dichotic asynchronous condition (Async-D; triangles), the better of the dichotic control conditions (Control-D; bowties), and the mean of the synchronous conditions (Sync-M; dashed line). Error bars indicate standard error of the mean (n = 9 for HI group; n = 7 for NH group; n = 8 for NHSL group). The shaded region at the bottom of each panel indicates the range over which masking release might be accounted for by reductions in masker level associated with amplitude modulation (3.2 dB).