The various stages of sleep are easily distinguished by
A) visible changes in respiration.
B) changes in motor movements involving speech.
C) changes in the electrical activity of the brain.
D) changes in consciousness.
E) the quality and quantity of dreams.

Question

Quizplus · Accepted Answer

The various stages of sleep are distinguished by changes in the electrical activity of the brain, which can be measured with an electroencephalogram (EEG). The different stages of sleep show distinct patterns of brain activity, so monitoring a person's brain waves during sleep can reveal which stage of sleep they are in.

The Various Stages of Sleep Are Easily Distinguished by