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Brain-stem auditory-evoked potentials recorded directly from human brain-stem and thalamus
Brain : a Journal of Neurology
|December 1, 1981
Summary
Brain-stem auditory-evoked potentials (BAEPs) were mapped using intracranial and scalp electrodes. Findings pinpoint specific brain regions generating distinct BAEP components, crucial for interpreting far-field potentials.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Neurosurgery
Background:
- Brain-stem auditory-evoked potentials (BAEPs) are essential for assessing auditory pathway integrity.
- Understanding the intracranial origins of scalp-recorded BAEPs is critical for accurate neurodiagnosis.
Purpose of the Study:
- To precisely localize the generation sites of scalp-recorded BAEP components using intracranial recordings.
- To investigate the relationship between intracranial and far-field BAEPs in neurosurgical patients.
Main Methods:
- Recording BAEPs from surface electrodes on the scalp, VIIIth nerve, medulla, pons, midbrain, cortex, and depth electrodes in the thalamus and ventricles.
- Utilizing a movable electrode for precise intracranial potential mapping.
- Analyzing amplitude changes and latency shifts of BAEP components relative to electrode position.
Main Results:
- Scalp BAEPs within 10 ms consist of a slow positive wave, a negative wave, and superimposed wavelets.
- Wave I originates from the distal VIIIth nerve, Wave V from the midbrain (inferior colliculus), and Wave VI from the medial geniculate body.
- Rapid intracranial amplitude changes were observed in the brain-stem, with slower changes rostrally, indicating potential overlap.
Conclusions:
- Specific intracranial sources were identified for major scalp BAEP components.
- The overlap of potentials and distance-dependent latency shifts necessitate careful interpretation of intracranial recordings for far-field potential origins.