I seek to learn from experts whether an audiometry could be best used in a case-control study to study persons with brain disorder to assess the hearing disability and its progression
Persons with neurological disorder need OBJECTIVE AUDIOMETRY. This can be achieved through the use of impedance audiometry, otoacoustic emissions and auditory brainstem response amongst others.
I agree with Immaculata and recommend also doing MLR& LLR as electrophysiologic central auditory tests and also CAPD test battery if you need psychoacoustic tests..