18
19
Ionic concentrations in neurons
Generalities
Awake: outward focus
Asleep
OR concentration
Awake: inward focus
Sleepy, spaced out
10 20
Dynamic changes
in frequency
power over time
Frequency (H z)
Power (dB)
Eyes open
Complexity of on-going EEG spectral power
EEG is generated by synchronous patches
EEG sources can be separated mathematically
Independent
component
analysis
(ICA)
separates
mixed EEG
signals at
the
scalp into
temporally
independent
time
courses
Makeig & Onton,
“ERP Features and
EEG Dynamics: An ICA
Perspective” in
Oxford Handbook of Event-
Related Potential Components
theta (4-7 Hz) is a normal frequency for frontal
midline region
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