In Preparing a Patient for an EEG, which instruction is essential for the baseline reading?

• A. Remain absolutely motionless during the baseline reading
• B. Stand up and move during the baseline reading
• C. Close the eyes and blink rapidly during the baseline
• D. Listen to music during the baseline

Answer: (A)

An EEG baseline aims to capture the brain’s resting electrical activity with as little interference as possible. Staying absolutely motionless is essential because movement from the body, face, or even slight shifts in posture creates electrical artifacts that distort the tracing and hide the true resting patterns. If the patient stands or moves, the baseline becomes full of artifacts and isn’t reliable. Eyes closing, blinking, or listening to music would either introduce artifacts or alter brain activity, changing the reading from a true resting state. Therefore, the key instruction is to remain motionless during the baseline.