Eeg And Sleep Physiology Ppt
Sleep is a dynamic, highly organized, and active biological process essential for human survival, cognitive function, and metabolic homeostasis. Far from being a state of passive brain inactivity, sleep involves complex, bi-directional neural networks that orchestrate profound changes across the entire central nervous system.
Direct transition from wakefulness to REM sleep.
: A classic timeline graph (hypnogram) showing a healthy adult stepping down from Wake to N1, N2, N3, and cycling back up to REM.
Sleep is divided into five distinct stages (or four based on newer classifications) based on EEG patterns: Awake, N1 (NREM), N2 (NREM), N3 (NREM - Slow Wave Sleep), and REM. A. Wakefulness eeg and sleep physiology ppt
Visual: Side-by-side cropped raw EEG traces of a 14 Hz spindle burst and a high-voltage K-complex. Content: The 20% rule per epoch, amplitude, and 0.5–2 Hz frequency. Slide 9: Paradoxical REM Sleep
"The EEG is the Rosetta Stone of sleep physiology. It translates the silent electrical language of the thalamocortical network into readable stages that tell us about memory, metabolism, and mental health."
This stage represents "true" sleep. The EEG is characterized by Sleep Spindles (brief bursts of 11–16 Hz activity) and K-complexes Sleep is a dynamic, highly organized, and active
A healthy young adult spends roughly 5% of the night in N1, 50% in N2, 20% in N3, and 25% in REM. The first half of the night is dominated by deep slow-wave sleep (N3), while the second half contains longer periods of Rapid Eye Movement (REM) sleep. Slide 5: Non-REM Stage 1 (N1) – Transition to Sleep
As cellular metabolism occurs throughout the day, adenosine levels rise in the basal forebrain.
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Create a visual grid comparing Beta, Alpha, Theta, and Delta waves side-by-side.
The EEG records the electrical activity generated by the synchronous firing of thousands of cortical neurons. Electrodes placed on the scalp amplify these microvolt-level signals, translating them into wavy line patterns that reveal the functional state of the brain.
Measures brain electrical activity.