Eeg And Sleep Physiology Ppt Jun 2026

Tracks eye movements, critical for identifying Rapid Eye Movement (REM) sleep.

To initiate sleep, the wake-promoting circuits must be inhibited.

REM (Rapid Eye Movement) Sleep Content:

(0.5–2 Hz). This is the period of physical restoration and hormonal regulation. REM Sleep: eeg and sleep physiology ppt

To monitor brain electrical activity and determine sleep stages.

Electrodes placed on the scalp detect tiny voltage fluctuations.

Driven by neurotransmitters like acetylcholine, norepinephrine, serotonin, dopamine, and histamine. Orexin (hypocretin) neurons stabilize this awake state. Tracks eye movements, critical for identifying Rapid Eye

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).

The thalamus acts as the gatekeeper to the cerebral cortex. During wakefulness, thalamic neurons fire continuously, allowing sensory information to reach the cortex. During non-rapid eye movement (NREM) sleep, these neurons switch to a bursting, rhythmic mode. This hyperpolarization disconnects the cortex from the external environment, generating characteristic sleep EEG waveforms like spindles and slow waves. 3. EEG Waveforms: The Language of the Brain

Sleep EEGs are vital for diagnosing various disorders by tracking abnormal brain waves, breathing, and movement: Neurotech EEG Sleep Apnoea: This is the period of physical restoration and

The EEG is invaluable for diagnosing various sleep disorders:

A normal night of sleep consists of 4 to 6 cycles of these stages, each lasting roughly 90 to 110 minutes. Wakefulness (W)