Maxwell is a participant in a research study aimed at understanding how the brain responds to prolonged periods of isolation. after spending several hours in a room alone, maxwell undergoes a(n) procedure; a method that measures the brain’s electrical activity using electrodes placed on the scalp.

Electroencephalography

Explanation:

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question Maxwell is undergoing a Electroencephalography. This is a procedure which like mentioned in the question is a method used in order to graph all the electrical activity happening in the brain and is done through electrodes attached to the scalp.

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d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."