Eeg And Sleep Physiology Ppt Jun 2026

Frequent micro-arousals (abrupt shifts to higher EEG frequencies) often caused by Sleep Apnea or Periodic Limb Movement Disorder (PLMD).

Stage N2 is the first true "sleep" signature and accounts for 45–55% of total sleep time in adults. The EEG is characterized by the presence of two specific transient events superimposed on a background of theta waves:

Introduction to Sleep Regulation (Process C & Process S) Slide 4: Polysomnography (PSG) Components (EEG, EOG, EMG) eeg and sleep physiology ppt

Throughout the night, sleep progresses through a series of cycles, each lasting about 90-100 minutes. A typical night's sleep will include 4 to 6 of these cycles. The architecture of a sleep cycle changes overnight: early cycles contain proportionally more N3 deep sleep, while later cycles have a greater proportion of REM sleep, which tends to become longer and more frequent towards morning.

Driven by neurotransmitters like acetylcholine, norepinephrine, serotonin, dopamine, and histamine. Orexin (hypocretin) neurons stabilize this awake state. A typical night's sleep will include 4 to 6 of these cycles

: High-quality PPTs provide side-by-side snapshots of 30-second EEG "epochs," allowing you to see the distinct transition from high-frequency Beta waves (wakefulness) to the Delta waves (deep sleep) and Sawtooth waves (REM).

Prominent in the occipital region when a person is awake but relaxed with their eyes closed. Orexin (hypocretin) neurons stabilize this awake state

As the subject relaxed with eyes closed, the EEG showed a steady, rhythmic "alpha" wave (8–13 Hz). But then, something shifted. The alpha waves began to break apart and disappear. Normal EEG Waveforms - StatPearls - NCBI Bookshelf 3 Aug 2025 —

Growth hormone is released, tissue repair occurs, and the glymphatic system clears metabolic waste from the brain. EOG: No eye movements. EMG: Low muscle tone. 5. Stage R (REM Sleep)

An EEG captures the summed postsynaptic potentials from thousands of cortical neurons firing in a synchronized fashion. This activity is recorded via electrodes placed on the scalp, providing a non-invasive measure of brain function.

Your PPT should highlight how the body's autonomous systems change outside of the brain.