Which of the following reveals the electrical activity of the brain by producing a record of brain waves?

Question

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An electroencephalograph (EEG) produces a record of brain waves by measuring the electrical activity of the brain. MR (magnetic resonance) and CT (computed tomography) scans create images of the brain but do not measure electrical activity. PET (positron emission tomography) scans measure brain activity by detecting the uptake of a radioactive tracer, but do not produce a record of brain waves.

Which of the Following Reveals the Electrical Activity of the Brain