Auditory Evoked Responses (AERs)
Thalı́a Harmony · 2021
In 1938, Loomis, Harvey, and Hobart reported that a response to auditory stimulation could be observed in the raw EEG during sleep. In order to simplify the discussion of responses to auditory stimuli, early Auditory Evoked Responses components and their clinical applications are discussed first, then the middle and late components, and finally the excitability cycle and the fre quency following response. Hecox and Galambos described the normal relationship between signal intensity and BAER characteristics. BAERs are extremely useful in the diagnosis of retrocochlear or brainstem lesions. Stockard and Rossiter recorded the BAERs in over 100 neurological patients and correlated the abnormalities of each component with postmortem or radiological localization of different brain-stem lesions. Analysis of the subject population and procedures revealed several variables that were not distributed uniformly across age—namely, rearing status, race, and equipment used for a data collection.