Brainwaves
A starting point for understanding neural rhythms, frequency bands, and the context behind a signal.
The starting point
Brain activity has patterns that can be described by their frequency. EEG records electrical activity, and those patterns vary with circumstances such as alertness and sleep. Our focus is on what a rhythm tells us—and what it does not.
Questions in focus
- What is a frequency band, and how are its boundaries defined?
- Where was a signal measured, and under what conditions?
- Does a reported change tell us anything about behavior or health?
Further context
- EEG: what the test measuresMedlinePlus · National Library of Medicine
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