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EEG (electroencephalogram) recording of the electrical activity of the brain
used to diagnose epilepsy and other brain disorders
hair, scalp, skull EEGs can be technically difficult due to interference from these three
things
frequency and amplitude EEG measures these two things
alpha, beta, delta, theta types of brain wave patterns
alpha waves relaxed, closed eyes
8-13 Hz
most common in adults
beta alert, open eyes
13-30 Hz