Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation
Objective: To determine speech-perception-in-noise (with speech and noise spatially distinct and coincident) and bilateral spatial benefits of head-shadow effect, summation, squelch and spatial release of masking in adults with delayed sequential cochlear implants. Study design: A cross-sectional...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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AOSIS
2012-12-01
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| Series: | South African Journal of Communication Disorders |
| Subjects: | |
| Online Access: | https://sajcd.org.za/index.php/sajcd/article/view/21 |
| _version_ | 1819089170142855168 |
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| author | Ilze Oosthuizen De Wet Swanepoel Catherine van Dijk |
| author_facet | Ilze Oosthuizen De Wet Swanepoel Catherine van Dijk |
| author_sort | Ilze Oosthuizen |
| collection | DOAJ |
| description | Objective: To determine speech-perception-in-noise (with speech and noise spatially distinct and coincident) and bilateral spatial benefits of head-shadow effect, summation, squelch and spatial release of masking in adults with delayed sequential cochlear implants.
Study design: A cross-sectional one group post-test-only exploratory design was employed. Eleven adults (mean age 47 years; range 21 – 69 years) of the Pretoria Cochlear Implant Programme (PCIP) in South Africa with a bilateral severe-to-profound sensorineural hearing loss were recruited. Prerecorded Everyday Speech Sentences of The Central Institute for the Deaf (CID) were used to evaluate participants’ speech-in-noise perception at sentence level. An adaptive procedure was used to determine the signal-to-noise ratio (SNR, in dB) at which the participant’s speech reception threshold (SRT) was achieved. Specific calculations were used to estimate bilateral spatial benefit effects.
Results: A minimal bilateral benefit for speech-in-noise perception was observed with noise directed to the first implant (CI 1) (1.69 dB) and in the speech and noise spatial listening condition (0.78 dB), but was not statistically significant. The head-shadow effect at 180° was the most robust bilateral spatial benefit. An improvement in speech perception in spatially distinct speech and noise indicates the contribution of the second implant (CI 2) is greater than that of the first implant (CI 1) for bilateral spatial benefit.
Conclusion: Bilateral benefit for delayed sequentially implanted adults is less than previously reported for simultaneous and sequentially implanted adults. Delayed sequential implantation benefit seems to relate to the availability of the ear with the most favourable SNR. |
| first_indexed | 2024-12-21T22:03:40Z |
| format | Article |
| id | doaj.art-6af66527f8d644528df6744b6daf03a9 |
| institution | Directory Open Access Journal |
| issn | 0379-8046 2225-4765 |
| language | English |
| last_indexed | 2024-12-21T22:03:40Z |
| publishDate | 2012-12-01 |
| publisher | AOSIS |
| record_format | Article |
| series | South African Journal of Communication Disorders |
| spelling | doaj.art-6af66527f8d644528df6744b6daf03a92022-12-21T18:48:46ZengAOSISSouth African Journal of Communication Disorders0379-80462225-47652012-12-01591455210.4102/sajcd.v59i1.2121Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantationIlze Oosthuizen0De Wet Swanepoel1Catherine van Dijk2Department of Communication Pathology, University of PretoriaDepartment of Communication Pathology, University of Pretoria; Callier Center, School of Behavioral & Brain Sciences, University of Texas, Dallas, Texas, USA; Ear Science Institute Australia, Subiaco, Australia, and Ear Sciences Centre, School of SurgeryDepartment of Communication Pathology, University of PretoriaObjective: To determine speech-perception-in-noise (with speech and noise spatially distinct and coincident) and bilateral spatial benefits of head-shadow effect, summation, squelch and spatial release of masking in adults with delayed sequential cochlear implants. Study design: A cross-sectional one group post-test-only exploratory design was employed. Eleven adults (mean age 47 years; range 21 – 69 years) of the Pretoria Cochlear Implant Programme (PCIP) in South Africa with a bilateral severe-to-profound sensorineural hearing loss were recruited. Prerecorded Everyday Speech Sentences of The Central Institute for the Deaf (CID) were used to evaluate participants’ speech-in-noise perception at sentence level. An adaptive procedure was used to determine the signal-to-noise ratio (SNR, in dB) at which the participant’s speech reception threshold (SRT) was achieved. Specific calculations were used to estimate bilateral spatial benefit effects. Results: A minimal bilateral benefit for speech-in-noise perception was observed with noise directed to the first implant (CI 1) (1.69 dB) and in the speech and noise spatial listening condition (0.78 dB), but was not statistically significant. The head-shadow effect at 180° was the most robust bilateral spatial benefit. An improvement in speech perception in spatially distinct speech and noise indicates the contribution of the second implant (CI 2) is greater than that of the first implant (CI 1) for bilateral spatial benefit. Conclusion: Bilateral benefit for delayed sequentially implanted adults is less than previously reported for simultaneous and sequentially implanted adults. Delayed sequential implantation benefit seems to relate to the availability of the ear with the most favourable SNR.https://sajcd.org.za/index.php/sajcd/article/view/21bilateral benefit, cochlear implant, head shadow effect, sequential implantation, speech-perception-in-noise, squelch, summation |
| spellingShingle | Ilze Oosthuizen De Wet Swanepoel Catherine van Dijk Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation South African Journal of Communication Disorders bilateral benefit, cochlear implant, head shadow effect, sequential implantation, speech-perception-in-noise, squelch, summation |
| title | Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| title_full | Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| title_fullStr | Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| title_full_unstemmed | Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| title_short | Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| title_sort | speech perception in noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation |
| topic | bilateral benefit, cochlear implant, head shadow effect, sequential implantation, speech-perception-in-noise, squelch, summation |
| url | https://sajcd.org.za/index.php/sajcd/article/view/21 |
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