What describes stimulation or detection of electrical activity in the brain using an electrode?

• A. Electrical Stimulation of the Brain (ESB)
• B. Electroencephalography (EEG)
• C. Magnetoencephalography (MEG)
• D. Functional MRI (fMRI)

Answer: (A)

The main idea here is using an electrode to influence or measure brain activity directly. Electrical Stimulation of the Brain is the method that explicitly describes applying electrical impulses to brain tissue via implanted electrodes, and it can also involve monitoring the brain’s electrical responses. That direct, electrode-based approach is what sets this option apart from the others: EEG uses scalp electrodes just to record electrical activity, MEG detects brain activity through magnetic fields with sensors outside the head, and fMRI tracks changes in blood flow rather than electrical signals. So the electrode-focused description best matches electrical stimulation of the brain.