Cortical auditory evoked potential time-frequency growth functions for fully objective hearing threshold estimation

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dc.contributor.authorMao, Darren
dc.contributor.authorInnes-Brown, Hamish
dc.contributor.authorPetoe, Matthew
dc.contributor.authorWong, Yan
dc.contributor.authorMcKay, Colette
dc.date.accessioned2019-12-09T00:52:23Z
dc.date.available2019-12-09T00:52:23Z
dc.date.issued2018-12
dc.description.abstractCortical auditory evoked potential (CAEPs) thresholds have been shown to correlate well with behaviourally determined hearing thresholds. Growth functions of CAEPs show promise as an alternative to single level detection for objective hearing threshold estimation; however, the accuracy and clinical relevance of this method is not well examined. In this study, we used temporal and spectral CAEP features to generate feature growth functions. Spectral features may be more robust than traditional peak-picking methods where CAEP morphology is variable, such as in children or hearing device users. Behavioural hearing thresholds were obtained and CAEPs were recorded in response to a 1 kHz puretone from twenty adults with no hearing loss. Four features, peak-to-peak amplitude, root-mean-square, peak spectral power and peak phase-locking value (PLV) were extracted from the CAEPs. Functions relating each feature with stimulus level were used to calculate objective hearing threshold estimates. We assessed the performance of each feature by calculating the difference between the objective estimate and the behaviourally-determined threshold. We compared the accuracy of the estimates using each feature and found that the peak PLV feature performed best, with a mean threshold error of 2.7 dB and standard deviation of 5.9 dB across subjects from behavioural threshold. We also examined the relation between recording time, data quality and threshold estimate errors, and found that on average for a single threshold, 12.7 minutes of recording was needed for a 95% confidence that the threshold estimate was within 20 dB of the behavioural threshold, using the peak-to-peak amplitude feature, while 14 minutes is needed for the peak PLV feature. These results show that the PLV of CAEPs can be used to find a clinically relevant hearing threshold estimate. Its potential stability in differing morphology may be an advantage in testing infants or cochlear implant users.en_US
dc.description.sponsorshipDarren Mao was supported by an Australian Government Research Training Program Scholarship. Colette McKay was supported by a Veski innovation fellowship. Hamish Innes-Brown was supported by a National Health and Medical Research Council (Australia) Early-Career Research Fellowship.The Bionics Institute acknowledges the support it receives from the Victorian Government through its Operational Infrastructure Support Program.en_US
dc.identifier.citationMao, D., H. Innes-Brown, M. A. Petoe, Y. T. Wong, and C. M. McKay. 2018. Cortical auditory evoked potential time-frequency growth functions for fully objective hearing threshold estimation. Hearing Research. 370: 74-83.en_US
dc.identifier.issn0378-5955
dc.identifier.urihttp://repository.bionicsinstitute.org:8080/handle/123456789/372
dc.language.isoenen_US
dc.publisherElsevier, Inc.en_US
dc.subjectHearing thresholden_US
dc.subjectObjective audiometryen_US
dc.subjectElectroencephalographyen_US
dc.subjectSpectral analysisen_US
dc.subjectPhase-locking valueen_US
dc.subjectGrowth functionsen_US
dc.titleCortical auditory evoked potential time-frequency growth functions for fully objective hearing threshold estimationen_US
dc.typeArticleen_US
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