Question

he ______ records electrical activity in the brain through electrodes placed on the outside of the skull.
functional magnetic resonance imaging (fmri)
magnetic resonance imaging (mri)
electroencephalogram (eeg)
positron emission tomography (pet)

Explanation:

• Functional magnetic resonance imaging (fMRI) measures brain activity by detecting changes in blood flow, not via electrodes on the skull.
• Magnetic resonance imaging (MRI) creates detailed images of the brain's structure using magnetic fields and radio waves, not for recording electrical activity with electrodes.
• Electroencephalogram (EEG) specifically records the electrical activity of the brain using electrodes placed on the scalp (outside the skull), matching the description in the question.
• Positron emission tomography (PET) uses radioactive tracers to show brain activity and metabolism, not electrodes on the skull.

Answer:

C. electroencephalogram (EEG)