A relatively recent innovation in auditory evoked potentials is the narrowband CE-chirp, a sound stimulus designed to improve synchrony of evoked neural activity. This paper describes the key characteristics of ABR amplitude and latency, as well as signal-to-noise ratio for CE-chirp stimuli over a range of frequencies and levels, in comparison to conventional tonepip stimuli in the same group of individuals
A relatively recent innovation in auditory evoked potentials is the narrowband CE-chirp, a sound stimulus designed to improve synchrony of evoked neural activity. This paper describes the key characteristics of ABR amplitude and latency for CE-chirp stimuli over a range of frequencies and levels, in comparison to conventional tonepip stimuli in the same group of individuals.
Automated electrophysiological response detection is a key component of hearing screening programmes, and relies on balancing the time needed to complete the test, with appropriate statistical robustness in response detection. This article details a test strategy that may improve performance in ASSR detection by decreasing test time and increasing response detection rates.
This longitudinal study compares the accuracy of estimated hearing thresholds in hearing impaired infants using the ABR in the neonatal period, with the behavioural thresholds gathered at a later date when such behavioural testing became feasible. Agreement was around 10 dB for a 4 kHz tone-pip ABR and the corresponding behavioural threshold, and around 17 dB for the 1 kHz comparison.
The reality of hearing screening programmes is that recording conditions (noise levels) for measuring auditory evoked potentials can sometimes be less than ideal, and can change within a test session. This paper outlines the optimal settings of two key tools used for maximising the signal-to-noise ratio of auditory evoked potentials in a range of different noise levels.
These guidelines outline the equipment, preparation and procedures suitable for routine manual audiometry in adults and older children. These guidelines are widely followed in the UK. This and other resources are available for download at
This article describes the pathophysiology of BPPV, known as the most common of all complaints affecting the vestibular system. Principles of differential diagnosis of the sub-type of BPPV, the particular ear and semi-circular canal in question are also described, along with common corrective procedures used in the management of BPPV.
This article describes the basic principles and clinical application of rotational chair testing of the integrity of the horizontal vestibulo-ocular reflex. The sub components of the test are explained, as well as interpretation of the results.
This document contains proceedings from the WHO workshop, hosted with support from the Christoffel-Blindenmission (CBM) in Bensheim, Germany. The problems and needs for hearing aid provision, and audology training needs amongst of health workers in developing coutries across the six WHO regions were covered, and their conclusions presented.
This document outlines procedures for verification of the performance of a hearing aid (and ear mould) on a particular patient. Guidance is provided both for typical adults and children, and cases with added complexity such as with severe/profound losses, or those with a conductive component. These guidelines are widely followed in the UK. This and other resources are available for download at
These document outlines the aims of audiologic healthcare providers for their clients, and how the extent to which these aims are met might be demonstrated. Aims include the audiological assessment, hearing aid fitting, evaluation and follow-up.
This study aimed to determine the extent to which real-ear measurements are necessary in the fitting process of digital hearing aids, and the extent to which adjustments to the hearing aid settings are required in the verification process. The results showed 83% of aids met the desired performance after real-ear verification, compared with 63% before, supporting the need for these measures for more accurate fittings.
This study aims to document the extent to which a particular hearing device produces the performance to which the manufacturer states. Often the two will differ, for example due to manufacturer tolerances in components of the device, and the acoustical properties of the particular ear. The results showed that actual performance at some frequencies may be over 20 dB different than might be assumed from manufacturer guidelines.
This article outlines some of the limitations in real-ear measurements for verifying the fitting of a hearing aid, and a solution to at least some of these limitations in the form of ‘speech mapping’, i.e. documenting and visualising the audibility of sounds that are realistic to the hearing aid user, such as speech or music.
This article describes the advantages of incorporating hearing aid verification and validation process from the perspective of reducing the number of follow-up appointments that might be required for refitting/fine tuning, and from a consumer mobility and convenience perspective, improving satisfaction with the device.
From hearing screening to diagnostics and rehabilitation
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