Eeg And Sleep Physiology Ppt Online

Characterized by an Alpha rhythm (8–12 Hz) occupying more than 50% of the epoch in the occipital channels when eyes are closed. If eyes are open, low-amplitude, mixed-frequency beta activity dominates. EOG: Blinks, rapid eye movements, or reading eye movements. EMG: Relatively high, tonic muscle activity. 2. Stage N1 (Non-REM Stage 1) - Drowsiness / Transition

: When cropping EEG screenshots for your slides, use a clean 30-second epoch window. Ensure the gridlines are visible but faint so your audience can estimate time and amplitude.

In a clinical setting, we rarely look at EEG alone. Sleep is diagnosed using , a multi-parametric study that typically includes: eeg and sleep physiology ppt

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

Characterized by the appearance of two distinct neurophysiological markers: Characterized by an Alpha rhythm (8–12 Hz) occupying

: Crucial for detecting the alpha rhythm during wakefulness. Note: M1 and M2 refer to the mastoid processes behind the ears, used as neutral reference points. Slide 3: Fundamental EEG Waveforms

The transitions between wakefulness, NREM, and REM states are controlled by the interplay of several neurochemical systems. EMG: Relatively high, tonic muscle activity

N1 is the lightest stage of sleep, often called drowsiness. It is a brief transitional period lasting only 1 to 7 minutes. The defining EEG features are the dropout of alpha activity and the emergence of low-amplitude (4–7 Hz). Physiologically, slow rolling eye movements (SREMs) appear, and heart rate begins to slow. If awakened from N1, a person often feels as though they were not actually asleep.