Brainstem response audiometry in the determination of low-frequency hearing loss : a study of various methods for frequency-specific ABR-threshold assessment

The aim of this study was to explore the possibilities to make such a two-point ABRaudiogram. After a review of literature, two methods were considered to be suitable for obtaining a low-frequency-specific ABR. In the first place, the low-frequency specificity of the click stimulus masked with high-pass noise (Chapters ill and V) and subsequently, the low-frequency specificity of the brief tonal stimulus (Chapter IV and V) was studied. Finally, the highfrequency- specificity of the standard click-evoked ABR-threshold was reevaluated, as both points of a two point ABR-audiogram should preferably have the same degree of frequency specificity