You are watching sleep researchers monitor the sleep of a normal adult. the participant is hooked up to an eeg. what brain waves would you observe as the person becomes drowsy and then enters the first stage of sleep?
a. alpha eventually replaced by delta
b. alpha eventually replaced by theta
c. delta eventually replaced by beta
d. delta eventually replaced by theta
e. alpha eventually replaced by beta

The correct answer is option b. "Alpha eventually replaced by theta".

Explanation:

Electroencephalogram (EEG) techniques allows researchers to monitor the phases of sleeping according of what brain waves are seen in the equipment. A normal adult connected to EEG will respond with alpha waves during a wakeful state. However, as the person becomes drowsy and enters to the first stage of sleep, the alpha waves will be eventually replaced by theta waves. Theta waves are the dominant waves during sleeping, and also could be seen during deep meditation.