Auditory Brainstem Response (ABR)


Auditory brainstem response (ABR), are routinely used in the field of neurological and otological investigation. Non-invasive electrophysiology technique based on the principle of electroencephalography (EEG), ABR provide objective information, reproducible in the hearing function from the cochlea to the brainstem. They help to reveal the electrical activity of peripheral auditory pathways, through the application of acoustic stimulation (usually a click), in the overall activity of the EEG.


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There are two different types of auditory evoked potential tests.

The ABR latency are widely used to explore the nerve conduction in the auditory pathways. The dysfunction auditory pathways are highlighted by analyzing a time signal during tests at fixed intensity (greater than 80 dB HL). Typical ABR tracings consist of several waves numbered I to V. In the situation of ABR latency (neurological testing), the waves I, III and V must be clearly identified in a context of normality, with a variability from presence for waves II and IV. These waves should appear in a range of normality. Any lengthening from the latency for waves suspects a conduction disorder and suggests further investigation.

Moreover, applying acoustic stimuli of decreasing intensity, the ABR threshold can objectify the auditory threshold of each ear. Determining the auditory threshold is identified at the disappearance of wave V.


Echodia devices allowing  ABR measurements: ELIOS and BABYSCREEN.