Section 6 Electroencephalogram (EEG), Wakefulness and sleep
Section 6 Electroencephalogram (EEG), Wakefulness and Sleep
I. Electroencephalogram (EEG) 1. Brain Waves
I. Electroencephalogram (EEG) 1. Brain Waves
Brain Waves State of the brain o normal brain function involves continuous electrical activity o Patterns of neuronal electrical activity recorded are called brain waves o Brain waves change with age, sensory stimuli, brain disease. and the chemical state of the body o An electroencephalogram(EEG)records this activity o EEGs can be used to diagnose and localize brain lesions tumors, infarcts, infections, abscesses, and epileptic lesions o a flat EEG(no electrical activity) is clinical evidence of death
Brain Waves: State of the Brain ⚫ Normal brain function involves continuous electrical activity ⚫ Patterns of neuronal electrical activity recorded are called brain waves ⚫ Brain waves change with age, sensory stimuli, brain disease, and the chemical state of the body ⚫ An electroencephalogram (EEG) records this activity ⚫ EEGs can be used to diagnose and localize brain lesions, tumors, infarcts, infections, abscesses, and epileptic lesions ⚫ A flat EEG (no electrical activity) is clinical evidence of death
The eEG be recorded with Scalp electrodes through the unopened skull or with electrodes on or in the brain Blink artifacts Time(sec) 2 3 4 5 6 8 9 wrwywwwMv-nMmw www灬 wwlwywAnMh WON AA wwww Electrode Alpha rhythms Beta rhythms positions A normalEEg
The EEG be recorded with Scalp electrodes through the unopened skull or with electrodes on or in the brain. A normal EEG
Electroencephalogram(EEG) Copyright e The MeGraw-Hill Companies, Inc, Permission required for reproduction or display ● Measures synaptic potentials Alpha任 produced at cell bodies and Beta Hwrwwm个以的 dendrites Create electrical currents Theta HwunnMMn/M ● Used clinically diagnose epilepsy and brain death Delta 1 sec
Electroencephalogram (EEG) ⚫ Measures synaptic potentials produced at cell bodies and dendrites. – Create electrical currents. ⚫ Used clinically diagnose epilepsy and brain death