Which of the following occurs in the first stage of sleep?

A) Short runs of rhythmical responses of 12 to 16 hertz
B) An occasional sharp rise and fall in the amplitude of the entire EEG
C) Less regular and lower amplitude brain waves
D) A pattern of slow waves of 1 to 2 hertz

Brain Waves

Electrical patterns in the brain that can be measured and are indicative of various states of consciousness.

Amplitude

The peak value of a wave or signal which represents its maximum intensity or overall change.

EEG

Electroencephalography, a method used to record the electrical activity of the brain, often through electrodes placed on the scalp.