A researcher places closely spaced electrodes on her participants' heads in order to study brain activity. She is using the ________ technique.

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Electroencephalography (EEG) is a technique that involves placing electrodes on the scalp to measure electrical activity in the brain. It is commonly used to study brainwave patterns associated with different states of consciousness, such as waking, sleeping, and dreaming. The other options listed (PET, fMRI, EMG) involve different imaging techniques that do not use electrodes on the scalp.

A Researcher Places Closely Spaced Electrodes on Her Participants' Heads