Physiology Ppt | Eeg And Sleep

"It is a common misconception that EEG records action potentials. It does not. Action potentials are too brief and asynchronous to be picked up by scalp electrodes. Instead, EEG records Post-Synaptic Potentials . Specifically, we are looking at the summation of electrical dipoles created by pyramidal neurons. When thousands of these neurons fire in synchrony—driven largely by thalamic pacemaker cells—we see a distinct wave pattern. If they fire asynchronously, the voltage cancels out, resulting in a low-amplitude, mixed-frequency signal."

Include a slide for each frequency band to help your audience identify them: : Active, alert, or anxious thinking. Alpha (8–13 Hz) : Relaxed wakefulness with eyes closed. Theta (4–8 Hz) : Light sleep or deep relaxation. Delta (0.5–4 Hz) : Deep, slow-wave sleep . 3. The Stages of Sleep (Physiology) Organize this section into the 90-minute sleep cycle: eeg and sleep physiology ppt

A full sleep cycle typically lasts around 90-120 minutes and consists of stages 1-4 NREM sleep, followed by REM sleep. A normal night's sleep consists of 3-5 cycles. "It is a common misconception that EEG records