Effects of hearing impairment and presentation level on masking period patterns for Schroeder-phase harmonic complexes

Masking period patterns (MPPs) for Schroeder-Phase harmonic complexes conta ining equal amplitude harmonics of a 100-ITz fundamental were determined fo r 5-ms tonal probes at 4000 and 1000 Hz. Maskers consisted of harmonics 2-5 0 (200-5000 Hz bandwidth) for 4000-Hz probes and harmonics 2-20 (200-2000 H z) for 1000-Hz signals. Masked thresholds were determined for probe onsets 153, 155.5, 158, 160.5, and 163 ms following masker onset (masker duration= 460 ms). Overall, results were similar for both probe frequencies. For list eners with normal hearing, MPPs for positive Schroeder-phase complexes mask ing 60 dB SPL probes were highly modulated and became flatter when probe le vel was increased to 80 dB SPL. MPPs were less modulated for listeners with sensorineural hearing loss than for normally hearing listeners at both 60 and 80 dB SPL probe levels. Thresholds in negative Schroeder-phase maskers were more similar across the two groups of listeners and across differences in probe position and probe level. The findings support an interpretation involving differences in the shape of the basilar-membrane waveform generat ed by each masker and possible influences of nonlinear cochlear processing on these internal responses. For normally hearing listeners, 60 dB SPL prob es were most difficult to detect when temporally positioned so that probe f requency and masker instantaneous frequency were closely matched. For 80 dB SPL probes and for hearing-impaired listeners, probes presented at these s ame positions were often more easily detected than probes at other position s. The latter result appears to involve benefit associated with in-phase ad dition of the probe to a portion of the masker similar to the probe in both frequency and phase. This benefit was reduced of entirely eliminated when probe phase was altered so that this in-phase addition did not occur. [S000 1-4966(00)05311-X].