1 MCQs in Medicine for NEET PG
A 24-year-old medical student undergoes routine EEG screening as part of a neurology research study. The recording shows arciform, wicket-shaped waveforms at 10 Hz in the central head regions (C3 and C4 leads). The structure marked **A** in the diagram is identified. When the patient is asked to clench his right fist, the waveforms in the left central lead (C3) promptly attenuate and disappear. Which of the following best explains the physiological basis for this reactivity?
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