The EEG is characterized by two primary dimensions:
It provides crucial insights into brain activity changes, distinguishing between waking, non-REM (NREM), and REM (Rapid Eye Movement) sleep. 2. EEG Rhythms and Brain Waves
): Prominent in the posterior head regions during relaxed wakefulness with eyes closed. Theta Waves (
Electroencephalography (EEG) is the gold standard for monitoring brain activity. When applied to sleep physiology, EEG transforms invisible neural patterns into a structured visual map of human rest. Understanding this relationship is essential for clinicians, researchers, and students studying polysomnography (PSG). eeg and sleep physiology ppt
The electroencephalogram (EEG) is a fundamental tool in sleep medicine. It records the brain’s electrical activity non-invasively, allowing researchers and clinicians to characterize the different stages of sleep. This report outlines the physiological basis of sleep, the distinct EEG patterns associated with each stage, and the clinical relevance of these findings.
Tracks eye movements (crucial for identifying REM).
Relaxed wakefulness with eyes closed (attenuates when eyes open). 4 – 7 Hz Drowsiness, light sleep, and deep relaxation. Delta ( ) 0.5 – 3.5 Hz Deep, slow-wave sleep; high amplitude ( 3. The Architecture of Sleep: Macro and Micro The EEG is characterized by two primary dimensions:
Muscle tone begins to relax, heart rate begins to slow, and slow rolling eye movements can be seen. 😴 Slide 6: NREM Stage 2 (N2) – True Sleep EEG & Sleep | PPTX - Slideshare
: Persistent muscle activity during REM sleep on the EMG channel. This is the hallmark diagnostic feature of REM Sleep Behavior Disorder (RBD), a condition strongly linked to neurodegenerative diseases like Parkinson's. Presentation Delivery Tips for Presenters
Dominated by high-amplitude (>75 microvolts), slow delta waves making up more than 20% of an epoch (a standard 30-second window of sleep recording). REM Sleep (R Stage) Theta Waves ( Electroencephalography (EEG) is the gold
: A standardized method to ensure reproducible electrode placement across different skull shapes.
Use a consistent color palette across your slides (e.g., Light Blue for N1, Dark Blue for N2, Purple for N3, and Red for REM).
: Low-voltage, mixed-frequency background waves. You will often see unique "sawtooth waves" —triangular, jagged 2–6 Hz runs that precede bursts of eye movements.
: Disruptions in this architecture point directly to sleep disorders like insomnia, apnea, or depression.
Before the advent of EEG, sleep was considered a monolithic state of rest. In 1953, the discovery of Rapid Eye Movement (REM) sleep by Aserinsky and Kleitman at the University of Chicago revolutionized our understanding of the brain. For the first time, researchers demonstrated that the brain undergoes a predictable, cyclic pattern of activity throughout the night, alternating between REM and Non-REM (NREM) periods.