File:Automated Auditory Brainstem Response.jpg
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Automated Auditory Brainstem Response
(AABR) uses a stimulus which is delivered through earphones and detected by scalp electrodes.
The infant test takes between 8 to 20 minutes and has a sensitivity 96-99%, and unlike other childhood auditory testing, does not require a subject response. The basis of a neonatal hearing test that uses a trigger stimulus delivered through earphones and subsequent brain electrical activity then detected by scalp electrodes. Then by computer analysis, averaging all the electrical activity following the trigger, peaks emerge reflecting signal passage activity through brain stem nuclei in the hearing central neural pathway.
An increased absolute latency has been seen to occur in premature infants (preterm birth) related to the decreased myelination affecting the electrical conduction delays up to the brainstem.
Waves I and II - arise ipsilaterally to the stimulus and reflect the action potential of the auditory nerve.
Waves III, IV and V - receive contralateral inputs.
Cite this page: Hill, M.A. (2024, April 27) Embryology Automated Auditory Brainstem Response.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Automated_Auditory_Brainstem_Response.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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