Adenosine builds up in the brain during prolonged wakefulness (homeostatic sleep drive) and excites the VLPO, promoting sleep onset. The Thalamocortical Loop
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.
. These slow waves must occupy (6 seconds) of a 30-second epoch. eeg and sleep physiology ppt
: A clean, four-row waveform comparison chart showing Beta, Alpha, Theta, and Delta waves side-by-side. Frequency Range Primary Associated State Beta (β) Low (< 20 µV) Active thinking, concentration, alert wakefulness. Alpha (α) 8 – 13 Hz Medium (20-60 µV)
Marked by an increase in high-frequency power (gamma and beta activity) during NREM sleep, showing cortical hyperarousal. Adenosine builds up in the brain during prolonged
Characterized by sleep spindles (12-15 Hz bursts) and K-complexes (high-amplitude waves). D. NREM Stage 3 (N3) - Slow Wave Sleep (SWS)
Most educational presentations on this topic, such as those found on Slideshare and SlideServe , cover the following standard elements: Frequency Range Primary Associated State Beta (β) Low
: Prominent during drowsiness and light sleep (Stage N1).