consciousness Flashcards
electroencephalography: define the main EEG rhythms which identify different levels of arousal
how are levels of arousal monitored
electroencephalography
EEG rhythms in sleep vs normal waking consciousness
sleep: delta waves slowest (up to 4Hz), theta (4-8 Hz), alpha (8-13 Hz), Beta (13-30 Hz) in normal waking consciousness; alpha is sign of healthy brain activity when eyes closed, and is lost and EEG becomes slower (theta and delta) in brain disorders
what are higher frequency neural oscillations (gamma approx 40 Hz) associated with
creation of conscious contents in focus of mind’s eye, via thalamo-cortical feedback loops
EEG waves: awake
beta waves (flat)
EEG waves: drowsy, relaxed
alpha waves (flat)
EEG waves: stage N1 sleep
theta waves
EEG waves: stage N2 sleep
sleep spindles
EEG waves: stage N3 sleep
delta waves (largest amplitude)
EEG waves: REM sleep
fast, random
diagram of EEG waves