Speech Pathology and Audiology Commons^™

Objective Measurement Optimization In Early Hearing Detection And Intervention, Matthew J. B. Urichuk

Electronic Thesis and Dissertation Repository

Following the fitting of amplification devices, outcomes need to be evaluated to determine benefit of intervention. Objective measurements, which generally require rapid acoustic or electrophysiological measurement without active participation of the individual, are one subset of evaluation methods.

This thesis aimed to improve the reliability, accuracy, and efficiency of a subset of objective outcome measurements: the speech-evoked Envelope Following Response (EFR), and the wideband real-ear-to-coupler-difference (wRECD), which are used in hearing aid validation and verification respectively.

The speech-evoked EFR, a neural response reflecting phase-locked activity to the envelope of a speech stimulus, can be detected using a variety of statistical …

Evaluation Of Auditory Evoked Potentials As A Hearing Aid Outcome Measure, Vijayalakshmi Easwar

Electronic Thesis and Dissertation Repository

This thesis aimed to explore the applicability of Cortical Auditory Evoked Potentials (CAEPs) and Envelope Following Responses (EFRs) as objective aided outcome measures for use in infants wearing hearing aids. The goals for CAEP-related projects were to evaluate the effect of speech stimulus source on CAEPs, non-linear hearing aid processing on tone-evoked CAEPs, and the effect of inter-stimulus intervals on non-linear hearing aid processing of phonemes. Results illustrated larger amplitude CAEPs with shorter latencies for speech stimuli from word-medial positions than word-initial positions, and no significant effect of the tone burst onset overshoot due to non-linear hearing aid processing. Inter-stimulus …