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evoked response

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e·voked response (-vkt)
n.
An alteration in the electrical activity of a particular part of the nervous system as a result of receiving a sensory stimulus.

evoked response
a technique for the detection of low amplitude electrical activity in response to stimuli for the purpose of evaluating sensory mechanisms. Called also evoked potential.

brainstem auditory evoked response (BAER)
variations in electromyographic or electroencephalographic recordings in response to sound stimuli. Used to evaluate brainstem lesions and hearing in dogs.
visual evoked response r's
electrical potentials to flash or pattern displays that are recorded over the occipital lobe region.

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Brain-stem evoked response waveform variation associated with recurrent otitis media.
Known as the auditory brain stem evoked response, the $35,000 machine sends soft sounds to a baby's ears, and the brain response is then passed via electrodes into a laptop computer for hearing analysis.
I would probably try other tests, including evoked responses and examinations of fluid obtained by spinal tap.
 
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