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...

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Main Authors:	Rahmat, Sarah, O’Beirne, G.A
Format:	Conference or Workshop Item
Language:	English
Published:	2014
Subjects:	RF Otorhinolaryngology
Online Access:	http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/4/49093new.pdf

id	iium-49093
recordtype	eprints
spelling	iium-490932018-06-11T02:28:27Z 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 Conference or Workshop Item 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
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	RF Otorhinolaryngology
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
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.
format	Conference or Workshop Item
author	Rahmat, Sarah O’Beirne, G.A
author_facet	Rahmat, Sarah O’Beirne, G.A
author_sort	Rahmat, Sarah
title	The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
title_short	The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
title_full	The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
title_fullStr	The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
title_full_unstemmed	The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function
title_sort	use of a fast method of recording schroeder phase masking function for measuring nonlinear cochlear function
publishDate	2014
url	http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/ http://irep.iium.edu.my/49093/4/49093new.pdf
first_indexed	2023-09-18T21:09:27Z
last_indexed	2023-09-18T21:09:27Z
_version_	1777411154765676544

The use of a fast method of recording Schroeder phase masking function for measuring nonlinear cochlear function

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