Threshold of octave masking as a tool to explain cochlear nonlinearity
Background and Aim: The threshold of octave masking test has been used to assess the growth rate of aural harmonics, the intercept point helped differentiate between normal-hearing individuals and sensorineural hearing loss due to noise exposure. With fewer literatures that have been documented, the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2021-01-01
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| Series: | Auditory and Vestibular Research |
| Subjects: | |
| Online Access: | https://avr.tums.ac.ir/index.php/avr/article/view/892 |
| _version_ | 1798028164425842688 |
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| author | Abishek Umashankar Lakshmanabharathi Ranganathan Pachaiappan Chandrasekaran Prashanth Prabhu |
| author_facet | Abishek Umashankar Lakshmanabharathi Ranganathan Pachaiappan Chandrasekaran Prashanth Prabhu |
| author_sort | Abishek Umashankar |
| collection | DOAJ |
| description | Background and Aim: The threshold of octave masking test has been used to assess the growth rate of aural harmonics, the intercept point helped differentiate between normal-hearing individuals and sensorineural hearing loss due to noise exposure. With fewer literatures that have been documented, there is a need to explore this test procedure, and hence the purpose of this research is to evaluate the utility of the threshold of octave masking (TOM) procedure in understanding the frequency selectivity and non-linear function of cochlea.
Methods: A total of 10 adults (20 ears) were considered for the test. The TOM test procedure was performed on the subjects where the subjects had to identify the presence of a maskee tone (1 kHz) in the presence of a masker tone (500 Hz) across 5 dB increment of masker tone until the subjects uncomfortable level. A line graph was drawn, extrapolated to identify the point of intercept, which is the threshold of octave masking.
Results: Results reveal that 17 ears did not have a linear growth but had a 10 to 20 dB gap after a particular maskee level. The intercept point of the initial two extreme points was relatively more than the intercept point of the extreme points at higher intensities.
Conclusion: Results from the present study have thrown light on the fact that TOM can be used as a test to measure the frequency selectivity along with the tests of psychophysical tuning curves, notched noise method, non-simultaneous masking, and other non-peripheral masking phenomena. |
| first_indexed | 2024-04-11T19:03:17Z |
| format | Article |
| id | doaj.art-c5b9018699e7452dbc24964b7adbe0c7 |
| institution | Directory Open Access Journal |
| issn | 2423-480X |
| language | English |
| last_indexed | 2024-04-11T19:03:17Z |
| publishDate | 2021-01-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | Auditory and Vestibular Research |
| spelling | doaj.art-c5b9018699e7452dbc24964b7adbe0c72022-12-22T04:07:53ZengTehran University of Medical SciencesAuditory and Vestibular Research2423-480X2021-01-0130110.18502/avr.v30i1.5308892Threshold of octave masking as a tool to explain cochlear nonlinearityAbishek Umashankar0Lakshmanabharathi Ranganathan1Pachaiappan Chandrasekaran2Prashanth Prabhu3Department of Audiology, All India Institute of Speech and Hearing, Mysuru, IndiaDepartment of Audiology, MERF Institute of Speech and Hearing (P) Ltd, Chennai, IndiaDepartment of Audiology, MERF Institute of Speech and Hearing (P) Ltd, Chennai, IndiaDepartment of Audiology, All India Institute of Speech and Hearing, Mysuru, IndiaBackground and Aim: The threshold of octave masking test has been used to assess the growth rate of aural harmonics, the intercept point helped differentiate between normal-hearing individuals and sensorineural hearing loss due to noise exposure. With fewer literatures that have been documented, there is a need to explore this test procedure, and hence the purpose of this research is to evaluate the utility of the threshold of octave masking (TOM) procedure in understanding the frequency selectivity and non-linear function of cochlea. Methods: A total of 10 adults (20 ears) were considered for the test. The TOM test procedure was performed on the subjects where the subjects had to identify the presence of a maskee tone (1 kHz) in the presence of a masker tone (500 Hz) across 5 dB increment of masker tone until the subjects uncomfortable level. A line graph was drawn, extrapolated to identify the point of intercept, which is the threshold of octave masking. Results: Results reveal that 17 ears did not have a linear growth but had a 10 to 20 dB gap after a particular maskee level. The intercept point of the initial two extreme points was relatively more than the intercept point of the extreme points at higher intensities. Conclusion: Results from the present study have thrown light on the fact that TOM can be used as a test to measure the frequency selectivity along with the tests of psychophysical tuning curves, notched noise method, non-simultaneous masking, and other non-peripheral masking phenomena.https://avr.tums.ac.ir/index.php/avr/article/view/892Threshold of octave maskingactive mechanismpassive mechanismnonlinearityfrequency selectivitypsychophysical tuning curves |
| spellingShingle | Abishek Umashankar Lakshmanabharathi Ranganathan Pachaiappan Chandrasekaran Prashanth Prabhu Threshold of octave masking as a tool to explain cochlear nonlinearity Auditory and Vestibular Research Threshold of octave masking active mechanism passive mechanism nonlinearity frequency selectivity psychophysical tuning curves |
| title | Threshold of octave masking as a tool to explain cochlear nonlinearity |
| title_full | Threshold of octave masking as a tool to explain cochlear nonlinearity |
| title_fullStr | Threshold of octave masking as a tool to explain cochlear nonlinearity |
| title_full_unstemmed | Threshold of octave masking as a tool to explain cochlear nonlinearity |
| title_short | Threshold of octave masking as a tool to explain cochlear nonlinearity |
| title_sort | threshold of octave masking as a tool to explain cochlear nonlinearity |
| topic | Threshold of octave masking active mechanism passive mechanism nonlinearity frequency selectivity psychophysical tuning curves |
| url | https://avr.tums.ac.ir/index.php/avr/article/view/892 |
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