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: High-frequency, low-voltage waves characteristic of an awake, alert brain.
Alpha waves drop below 50% of the epoch. They are replaced by low-amplitude, mixed-frequency theta waves (4–7 Hz). Vertex sharp waves may appear at the end of the stage. EOG: Slow, rolling eye movements. EMG: Muscle tone begins to decrease. Stage N2 (Stable NREM Sleep)
Distinct bursts of 11–16 Hz activity (most commonly 12–14 Hz) lasting at least 0.5 seconds. They are generated by the thalamic reticular nucleus.
Title: EEG and Sleep Physiology: The Cortical Architecture of Nocturnal Rest eeg and sleep physiology ppt
Electroencephalography (EEG) is the gold standard for monitoring brain activity and the cornerstone of sleep medicine. Whether you are preparing a lecture, a clinical seminar, or a slide deck, understanding the intersection of EEG and sleep physiology is essential. 1. Core Principles of EEG in Sleep Medicine
The brain controls the sleep-wake cycle through a delicate interplay of various neurotransmitters and nuclei.
The regulation of sleep relies on the interaction of two core processes: Vertex sharp waves may appear at the end of the stage
Sharp, biphasic waves with an initial negative high-voltage peak followed by a slower positive deflection. They must last at least 0.5 seconds and are maximal over frontal regions. Stage N3 (Deep / Slow-Wave Sleep)
Absent eye movements; delta wave breakthrough can sometimes cause artifactual deflections in EOG channels. EMG: Low to moderate tonic muscle activity. 5. Stage REM (Rapid Eye Movement) - Paradoxical Sleep
Understanding Sleep Architecture: A Guide to EEG and Sleep Physiology Stage N2 (Stable NREM Sleep) Distinct bursts of
N1 is the lightest stage of sleep, often called drowsiness. It is a brief transitional period lasting only 1 to 7 minutes. The defining EEG features are the dropout of alpha activity and the emergence of low-amplitude (4–7 Hz). Physiologically, slow rolling eye movements (SREMs) appear, and heart rate begins to slow. If awakened from N1, a person often feels as though they were not actually asleep.
Placed on the chin to monitor muscle atonia, a defining feature of REM sleep. 2. Neurobiology of the Sleep-Wake Cycle
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