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EEG

Parts of a normal EEG

QuestionAnswer
Alpha frequency 8-12 Hz
Beta frequency > 12 Hz
Theta frequency 4 to 7 Hz
Delta frequency < 4 Hz
Alpha Rhythm 8-12 Hz, 20-70 microvolts, occipital, blocks on eye opening
Stage I non-REM sleep Alpha drop out, diffuse slowing, vertex waves
Stage II non-REM sleep Vertex waves, sleep spindles
Slow wave sleep > 25% delta, > 75 microvolts, sleep spindles
REM sleep low voltage, mixed frequencies, usually alpha, rapid eye movements, no myogenic artifacts
Electroencephalography graphic representation of the difference in voltage between two different cerebral locations in time.
Volume conduction the process of current flow through the tissues between the electrical generator and the recording electrode
EEG source Both excitatory postsynaptic potentials (EPSPs) and inhibitory postsynaptic potentials (IPSPs) contribute to the synaptic activity recorded as EEG
Created by: dlardizabal
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