measuring brain activity

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10 Terms

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electrical activity of the brain

neural function depends on electrical events. electrical activity of neurons generates electrical field

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brain waves

electrical patterns observed

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alpha waves

in healthy, awake adults while resting with eyes closed during sleep. concentration on specific task

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beta waves

higher frequency than alpha waves. concentrating on task, under stress, or psychological tension

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theta waves

transiently during sleep in normal adults. observed in children and intensely frustrated adults

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delta waves

seen during sleep in all ages. seen in awake adults when damaged brain

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abnormal brain activity

electrical activity in cerebral hemispheres usually synchronized by a pacemaker that involves the thalamus

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asynchrony

may indicate localized damage or cerebral abnormality

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seizure

temporary cerebral disorder accompanied by an unusual neural activity. marked by change in pattern of electrical activity

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epilepsies

clinical conditions characterized by seizures that occur intermittently over period of time