(A fourth type of brain wave, called delta, is seen during deep sleep). Theta waves are often seen during times of drowsiness, daydreaming or during light sleep, but can also occur during thoughtless, restless overactivity. Beta waves are present when a person is interacting with the surrounding environment, and is concentrating, thinking, or solving problems. Alpha waves are seen when a person is in a relaxed state, and not actively thinking or interacting with one’s environment. There are several frequencies of brain waves when we are awake these are called alpha (medium), beta (fast), and theta (slow) waves. When the results of an EEG measurement are analyzed, scientists are able to identify certain brain wave patterns recorded by the machine. The human brain emits electrical activity in waves that can be measured by a device called an electroencephalograph (EEG).
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