The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
Background: A difference in masked thresholds at different scalar factors of the Schroeder masker (the "phase effect") can be observed in normal hearing listeners (Lentz & Leek, 2001). This was believed to be due to intact cochlear non-linearity, but recent findings have suggested a po...
| Main Authors: | , |
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| Format: | Proceeding Paper |
| Language: | English |
| Published: |
2014
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| Online Access: | http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/4/49093new.pdf |
| _version_ | 1848783399793197056 |
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| author | Rahmat, Sarah O’Beirne, G.A |
| author_facet | Rahmat, Sarah O’Beirne, G.A |
| author_sort | Rahmat, Sarah |
| building | IIUM Repository |
| collection | Online Access |
| description | Background: A difference in masked thresholds at different scalar factors of the Schroeder masker (the "phase effect") can be observed in normal hearing listeners (Lentz & Leek, 2001). This was believed to be due to intact cochlear non-linearity, but recent findings have suggested a possible contribution of a more central mechanism, presumably the medial olivary cochlear reflex (MOCR) (Wojtczak & Oxenham, 2010). We have recently developed a fast method for recording Schroeder phase masking functions which takes 8 minutes of testing time compared to 45 minutes using the conventional 3 AFC method. Our aim was to use this new method to study the mechanism underlying the phase effect.
Methods: 15 normal hearing and 15 sensorineural hearing loss (SNHL) participants were tested. Schroeder phase masking functions were measured at 250 Hz, 500 Hz, 1 kHz, 2 kHz at 45 dB and 75 dB masker levels in all participants, using both on-frequency and off-frequency masking.
Results: Phase effects were significantly reduced at low presentation levels and in participants with SNHL as compared to normal hearing participants (p<0.05), consistent with reduction of cochlear nonlinearity in those conditions. The phase effect was present in off-frequency masking and was significantly larger at 1 kHz and 2 kHz than at 500 Hz (p<0.05), supporting potential involvement of the MOCR which is active in off-frequency listening and shows strong effects at frequencies ≥ 1 kHz.
Conclusion: The findings were consistent with previous studies, suggesting that our fast method is a useful tool for recording Schroeder phase masking functions and investigating cochlear nonlinearity and the potential involvement of the MOCR in creating the phase effect, specifically at higher frequencies.
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| first_indexed | 2025-11-14T16:20:44Z |
| format | Proceeding Paper |
| id | iium-49093 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T16:20:44Z |
| publishDate | 2014 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-490932022-04-20T01:09:40Z http://irep.iium.edu.my/49093/ The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function Rahmat, Sarah O’Beirne, G.A RF Otorhinolaryngology Background: A difference in masked thresholds at different scalar factors of the Schroeder masker (the "phase effect") can be observed in normal hearing listeners (Lentz & Leek, 2001). This was believed to be due to intact cochlear non-linearity, but recent findings have suggested a possible contribution of a more central mechanism, presumably the medial olivary cochlear reflex (MOCR) (Wojtczak & Oxenham, 2010). We have recently developed a fast method for recording Schroeder phase masking functions which takes 8 minutes of testing time compared to 45 minutes using the conventional 3 AFC method. Our aim was to use this new method to study the mechanism underlying the phase effect. Methods: 15 normal hearing and 15 sensorineural hearing loss (SNHL) participants were tested. Schroeder phase masking functions were measured at 250 Hz, 500 Hz, 1 kHz, 2 kHz at 45 dB and 75 dB masker levels in all participants, using both on-frequency and off-frequency masking. Results: Phase effects were significantly reduced at low presentation levels and in participants with SNHL as compared to normal hearing participants (p<0.05), consistent with reduction of cochlear nonlinearity in those conditions. The phase effect was present in off-frequency masking and was significantly larger at 1 kHz and 2 kHz than at 500 Hz (p<0.05), supporting potential involvement of the MOCR which is active in off-frequency listening and shows strong effects at frequencies ≥ 1 kHz. Conclusion: The findings were consistent with previous studies, suggesting that our fast method is a useful tool for recording Schroeder phase masking functions and investigating cochlear nonlinearity and the potential involvement of the MOCR in creating the phase effect, specifically at higher frequencies. 2014-11-01 Proceeding Paper NonPeerReviewed application/pdf en http://irep.iium.edu.my/49093/4/49093new.pdf Rahmat, Sarah and O’Beirne, G.A (2014) The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function. In: Inner Ear Biology Workshop 2014, 1st-4th November 2014, Kyoto, Japan. (Unpublished) http://www.innerearbiology.eu/abstracts/IEB2014-AbstractBook-Kyoto.pdf |
| spellingShingle | RF Otorhinolaryngology Rahmat, Sarah O’Beirne, G.A The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function |
| title | The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
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| title_full | The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
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| title_fullStr | The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
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| title_full_unstemmed | The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
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| title_short | The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
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| title_sort | use of a fast method of recording schroeder phase masking function for measuring nonlinear cochlear function |
| topic | RF Otorhinolaryngology |
| url | http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/4/49093new.pdf |