Highly diminished muscle tone; no eye movements. Rapid Eye Movement (REM) Sleep
Low-voltage, mixed-frequency "sawtooth" waves. The brain looks metabolically similar to a wakeful state. EOG: Rapid, phasic eye movements.
Disappearance of the alpha rhythm, replaced by low-amplitude, mixed-frequency (LAMF) activity, predominantly in the theta band (4–7 Hz).
Sleep systems use pairs of electrodes to measure voltage differences, filtering out environmental noise. eeg and sleep physiology ppt
6. Slide-by-Slide Outline for an "EEG and Sleep Physiology" Presentation
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Sleep EEGs are vital for diagnosing various disorders by tracking abnormal brain waves, breathing, and movement: Neurotech EEG Sleep Apnoea: Highly diminished muscle tone; no eye movements
Marked by an increase in high-frequency power (gamma and beta activity) during NREM sleep, showing cortical hyperarousal.
Low-voltage, mixed-frequency EEG (predominantly Beta waves).
Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, inhibited sensory activity, and inhibition of nearly all voluntary muscles. EOG: Rapid, phasic eye movements
Dominated by alpha rhythm (8–12 Hz) in the occipital channels when eyes are closed. If eyes are open, the EEG shows low-voltage, mixed-frequency beta activity (13–30 Hz).
Sleep studies (polysomnography) use EEG alongside other measurements to diagnose: Sleep Apnea Narcolepsy Parasomnias (e.g., night terrors, sleepwalking)
Sleep is not merely an off-state of the brain but a dynamic, highly regulated physiological process essential for cognitive function, physical restoration, and overall health. While the average person sleeps for roughly a third of their life, the mechanisms governing this state have remained a profound mystery for much of modern science. We now understand that sleep disorders and insufficient rest are linked to an increased risk of cardiovascular disease, obesity, diabetes, and neurodegenerative diseases like dementia. To truly understand sleep, we must observe the electrical language of the brain, primarily through the .
In clinical sleep medicine, EEG is integrated into a broader diagnostic test called a polysomnogram. A standard PSG simultaneously records multiple physiological parameters: