Eeg And Sleep Physiology Ppt ((free)) Jun 2026

Understanding the intricate micro-architecture of sleep requires objective, high-resolution measurement. Electroencephalography (EEG) serves as the gold standard methodology for translating these underlying neurophysiological shifts into quantifiable, visual waveforms.

13–30 Hz low-amplitude, high-frequency waves during active mental concentration or when eyes are open. Stage N1 (Light NREM Sleep)

| Band | Frequency | Associated State | | :--- | :--- | :--- | | | 0.5–4 Hz | Deep, dreamless sleep (N3); slow-wave sleep | | Theta (θ) | 4–8 Hz | Light sleep, drowsiness, deep relaxation, memory encoding | | Alpha (α) | 8–13 Hz | Wakeful relaxation, eyes closed, calm with mental inactivity | | Beta (β) | 13–30 Hz | Active wakefulness, alert concentration, problem-solving | | Gamma (γ) | > 30 Hz | Higher cognitive processing, focused attention | eeg and sleep physiology ppt

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Sleep is a dynamic, active biological process essential for human survival, cognitive function, and metabolic health. Far from a state of simple inactivity, the sleeping brain undergoes highly organized, predictable cycles of electrical and physiological activity. Stage N1 (Light NREM Sleep) | Band |

Muscle atonia. Motor neurons are actively inhibited to prevent the physical acting out of dreams. 5. Clinical Anomalies and Sleep Disorders

Sleep studies (polysomnography) use EEG alongside other measurements to diagnose: Sleep Apnea Narcolepsy Parasomnias (e.g., night terrors, sleepwalking) Motor neurons are actively inhibited to prevent the

Driven by neurotransmitters like acetylcholine, norepinephrine, serotonin, dopamine, and histamine. Orexin (hypocretin) neurons stabilize this awake state.

Process C is an internal, biological clock operating on a roughly 24-hour cycle.

Sleep is divided into two major types:

How does the brain know when to sleep? Two systems interact: