University of Twente Student Theses

Towards objectifying spectral resolution in cochlear implant users : comparison of subjective and objective spectral ripple discrimination thresholds in normal hearing adults using the acoustic change complex.

Beijersbergen van Henegouwen, D.G. and Geesken, R.J. and Gelpke, C. and Hofma, C.G. (2021) Towards objectifying spectral resolution in cochlear implant users : comparison of subjective and objective spectral ripple discrimination thresholds in normal hearing adults using the acoustic change complex.

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Abstract:	Previous studies have found a correlation between spectral ripple discrimination and speech perception in cochlear implant (CI) users.[1][2] For this reason, spectral ripples are a promising tool for fitting of the CI. Nowadays, CI fitting depends on the cooperation of the user. However, not every CI user is capable of providing the needed feedback, such as young children and mentally retarded users. To this end, an objective means of fitting is desirable. In this research, we aim to investigate the relationship between subjective and objective spectral resolution in normal hearing listeners (n = 14) using spectral ripples. The subjective test consisted of a single-stimulus yes/no task. The subjective threshold was interpolated from the psychometric curve at 70% correct. The objective test consisted of electroencephalogram (EEG) measurements of the participant, while they were presented with repeating spectral ripple stimuli. The objective threshold was defined as the lowest ripple density at which an acoustic change complex was visible in the EEG. Discrimination thresholds as obtained with both methods were compared. Mean subjective threshold was significantly higher than the mean objective threshold but an insignificant, very weak correlation was found between the two values (r = 0.114, p value = 0.698). Our findings contradict previous studies that found a correlation between objective and subjective spectral ripple discrimination thresholds in CI users and normal hearing adults. We suggest future research should focus on investigating the correlation in CI users.
Item Type:	Essay (Bachelor)
Faculty:	TNW: Science and Technology
Subject:	44 medicine
Programme:	Technical Medicine BSc (50033)
Link to this item:	https://purl.utwente.nl/essays/86433
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