PTA is a behavioural test used to establish the hearing threshold, the softest sound that can be perceived in a controlled environment.
Tympanometry records changes in middle ear immittance with varying air pressure in the ear canal. It is a test used to detect disorders of the middle ear.
ABR is generated from auditory nerve, subsequent fibre tracts and nuclei within the auditory brainstem pathways. Sounds are introduced through the earphones to the patients’ ear, and a few electrodes are attached to the patient to record the response.
ASSR are brain response elicited by continuous steady-state modulated tonal acoustic stimuli. It is an objective frequency-specific hearing assessment which can be used to obtain detailed hearing sensitivity and auditory status in difficult to test patients.