If the eeg record reveals evidence of very small and very fast waves in a person that otherwise appears to be asleep, and other data indicates the person's eyes are moving back and forth but the rest of the body is still, you are likely to conclude that the sleeping person is in

You are likely to conclude that the sleeping person is in REM if the EEG record reveals evidence of very small and very fast waves in a person that otherwise appears to be asleep, and other data indicates the person's eyes are moving back and forth but the rest of the body is still.

A distinct period of sleep in mammals and birds, characterized by unsystematic movement of the low muscle tone throughout the body, eyes, and the propensity of the sleeper to dream vividly is called REM.