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A functional measure of brain activity: brain stem transmission time
Electroencephalography and Clinical Neurophysiology
|October 1, 1979
Summary
Brain stem transmission time (BTT) measures auditory nerve and brain stem responses. This diagnostic tool is reliable across various stimulus conditions, making it valuable for neurological assessments.
Area of Science:
- Neuroscience
- Audiology
- Clinical Diagnostics
Background:
- Surface-recorded auditory nerve and brain stem responses are crucial for diagnosing auditory and neurological conditions.
- Assessing the waveform of these responses is important for neurological diagnosis.
Purpose of the Study:
- To introduce and validate brain stem transmission time (BTT) as a measure of auditory brain stem response waveform.
- To evaluate BTT's utility as a functional test of brain stem activity.
Main Methods:
- Defined BTT as the interval between the auditory nerve response (earlobe-negative wave) and the inferior colliculus response (earlobe-positive wave).
- Analyzed BTT in relation to age, click intensity, conductive hearing loss, click rate, and click frequency.
Main Results:
- BTT is longest in neonates and reaches adult values around 3 years of age.
- BTT demonstrates relative independence from click intensity, conductive hearing loss, and click frequency.
- BTT remains stable across different stimulus rates, except at very high rates.
Conclusions:
- BTT is a reliable measure for assessing brain stem auditory pathway function.
- The stability of BTT across various stimulus conditions makes it a robust diagnostic tool for neurological evaluation.