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4 Cards in this Set

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I. Alpha

Calm, relaxed state of wakefulness.


Brain is "idle"


Low amplitude, slow, synchronous

Hitting the snooze alarm

II. Beta

Rhythmic, more irregular than alpha and higher frequency


Awake and mentally alert, as when we concentrate

What you should be doing right now

III. Theta

More irregular than beta


Common in children


Abnormal if present in adults who are awake

Common in children until age of 8 when they take on beta pattern

IV. Delta

High amplitude, low frequency


Deep sleep


RAS (reticular formation) is anesthetized


Indicates brain damage in awake adults