Waveform | Frequency (Hz) | Amplitude | Associated Clinical State -----------|----------------|-----------------|--------------------------------- Beta (β) | 13 – 30 Hz | Low (< 20 µV) | Active thinking, focus, eyes open Alpha (α) | 8 – 12 Hz | Medium (20-60µV)| Relaxed wakefulness, eyes closed Theta (θ) | 4 – 7 Hz | Variable | Light sleep (N1, N2), drowsiness Delta (δ) | 0.5 – 4 Hz | High (> 75 µV) | Deep sleep (N3 / Slow-Wave Sleep) Specialized Sleep Waveforms
High-amplitude peaks often triggered by environmental stimuli. Stage N3 (Deep Sleep):
Visualizing Sleep Architecture: The Sleep Cycle and Hypnogram
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Content: Alpha rhythm criteria for Wake; LAMF and vertex sharp waves for N1 transition.
Tie the physiology back to clinical practice to keep your audience engaged.
Delta waves must constitute more than 20% of a 30-second epoch to score it as N3. Stage R (REM Sleep) Waveform | Frequency (Hz) | Amplitude | Associated
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Electroencephalography measures the postsynaptic potentials of thousands of pyramidal neurons oriented perpendicularly to the scalp surface. In sleep medicine, EEG is paired with other physiological sensors to form a montage, which includes:
This comprehensive guide breaks down the essential concepts of sleep physiology and EEG patterns, structured perfectly for medical students, researchers, or professionals looking to build a high-quality presentation (). 1. Introduction to Sleep Physiology If you share with third parties, their policies apply
Generally, as we descend into deeper sleep, the frequency of brain waves decreases , while their amplitude increases .
An effective PPT on sleep physiology must include a visual or descriptive breakdown of standard EEG frequencies. Brain waves are categorized by their frequency (Hertz, or cycles per second) and amplitude:
Caused by a profound loss of orexin-producing neurons. Clinically, it manifests as Sleep-Onset REM Periods (SOREMPs) , where the patient bypasses NREM sleep and plunges directly into REM within 15 minutes of sleep onset. Parasomnias:
Characterized by slow waves (delta waves) with a frequency of 0.5 to 2 Hz and a peak-to-peak amplitude greater than 75 µV. To score an epoch as N3, these slow waves must constitute at least 20% of the 30-second window.