Modulation masking produced by a low-frequency pure tone
Hearing Research, ISSN: 0378-5955, Vol: 424, Page: 108596
2022
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Article Description
An intense low-frequency tone can affect the perception of amplitude modulation (AM) applied to a high-frequency carrier. Here, thresholds for detecting AM of a 3000-Hz carrier were measured in the presence of a 50-Hz pure tone at 91 dB SPL. When the carrier was presented at 20 dB sensation level (SL), the thresholds were higher than in the absence of the 50-Hz tone, increased when the AM frequency was increased from 20 to 100 Hz, and did not show a maximum near 50 Hz, as would be expected if the effect of the 50-Hz tone resulted from modulation detection interference. When the AM frequency was fixed at 50 Hz, the AM detection thresholds showed a minimum when the phase of the AM was 90° ahead of the phase of the 50-Hz tone (denoted Δ φ = 90°) and a maximum for Δ φ = 270°. To assess the role of the outer hair cells (OHCs), AM detection thresholds were measured as a function of Δ φ using SLs of 20 and 50 dB for normal-hearing participants and 20 dB for hearing-impaired participants. It was assumed that the latter would have impaired OHC function. The pattern of the results was similar across SLs and groups: AM detection thresholds were 8–10 dB lower for Δ φ = 90° than for Δ φ = 270° in all cases. This suggests that the OHCs do not play a large role in these effects and supports the idea that the low-frequency tone biases the responses of inner hair cells tuned to high frequencies.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0378595522001642; http://dx.doi.org/10.1016/j.heares.2022.108596; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85136158461&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/35998529; https://linkinghub.elsevier.com/retrieve/pii/S0378595522001642; https://dx.doi.org/10.1016/j.heares.2022.108596
Elsevier BV
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