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40 Hz--middle latency auditory evoked response in comatose patients
Electroencephalography and Clinical Neurophysiology
|September 1, 1987
Summary
Brain-stem auditory evoked response (BAER) and 40 Hz auditory evoked response (40 Hz AER) were studied in comatose patients. Findings suggest a potential midbrain origin for the 40 Hz AER.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Clinical Neurophysiology
Background:
- Comatose patients often exhibit altered auditory processing.
- Auditory evoked responses (AERs) are valuable tools for assessing brainstem and cortical function.
- The generator of the 40 Hz AER remains debated, with potential midbrain involvement.
Purpose of the Study:
- To investigate the utility of Brain-stem auditory evoked response (BAER) and 40 Hz middle latency auditory evoked response (40 Hz AER) in comatose patients.
- To explore the concept of a midbrain generator for the 40 Hz AER.
Main Methods:
- Elicitation of BAER and 40 Hz AER in 12 comatose patients.
- Analysis of electrophysiological data to identify response characteristics.
Main Results:
- BAER and 40 Hz AER were successfully elicited in the studied comatose patients.
- The study provides data supporting the discussion on the midbrain origin of 40 Hz AER.
Conclusions:
- BAER and 40 Hz AER can be valuable electrophysiological measures in comatose patients.
- Evidence discussed supports the hypothesis of a midbrain generator for the 40 Hz AER, warranting further investigation.