What technique of measuring brain responses requires that the individual lay still inside a machine that uses a magnetic field to record changes in blood flow and oxygen use?

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The technique of measuring brain responses that requires an individual to lay still inside a machine that uses a magnetic field to record changes in blood flow and oxygen use is fMRI (functional magnetic resonance imaging). EEG (electroencephalogram) measures electrical activity in the brain and does not require an individual to lay still within a machine. EKG (electrocardiogram) measures electrical activity in the heart, not the brain. PET (positron emission tomography) uses a radioactive tracer to measure brain activity, but does not rely on magnetic fields.

What Technique of Measuring Brain Responses Requires That the Individual