Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Brainstem Auditory Evoked Responses

  • Flora M. HammondEmail author
  • Sheryl Katta-Charles
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_7


Auditory brainstem responses (ABR); Auditory brainstem response audiometry; Auditory evoked response (AER); BAER; Brainstem auditory evoked potentials (BAEP); Brainstem response (BSR)


Brainstem auditory evoked responses (BAER) test the function of the auditory nerve and auditory pathways of the brain by measuring the electrophysiologic responses to repeated clicks presented to each ear. The response time of electrical waves generated from different anatomical parts of the brain-ear system are plotted as summarized below (Lew et al. 2007):
  • Wave I: Cochlear nerve (CN VIII)

  • Wave II: Cochlear nucleus (CN VIII)

  • Wave III: Superior olivary complex

  • Wave IV: Lateral lemniscus

  • Wave V: Inferior colliculus

Waveform morphology and interwave differences are compared to healthy controls to establish abnormality in function along the auditory pathway. Unilateral delays suggest a lesion to cranial nerve VIII along its pathway or in the brainstem. BAER may be abnormal in acoustic...

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References and Readings

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Physical Medicine and RehabilitationIndiana University School of MedicineIndianapolisUSA