Eeg And Sleep Physiology — Ppt [repack]

According to the American Academy of Sleep Medicine (AASM) manual, sleep is divided into Non-Rapid Eye Movement (NREM) stages and Rapid Eye Movement (REM) sleep. Wakefulness (W)

Placed on the chin to monitor muscle atonia, a defining feature of REM sleep. 2. Neurobiology of the Sleep-Wake Cycle

For a presentation-ready resource on EEG and sleep physiology, the review article is an excellent choice . It bridges basic sleep research with technical recording rules, making it highly suitable for PPT content. Key Papers for EEG & Sleep Physiology

"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."

Body temperature drops during NREM and is actively regulated. Thermoregulation is largely suspended during REM. eeg and sleep physiology ppt

The urge to sleep, which increases the longer we stay awake.

High frequency, low amplitude. These waves indicate an alert, active, and anxious mind.

The accumulation of sleep-inducing chemicals (primarily adenosine) in the brain during wakefulness. The longer you stay awake, the stronger the pressure to sleep becomes. 2. The Role of Polysomnography (PSG)

: Characterized by high-amplitude, low-frequency Delta waves . According to the American Academy of Sleep Medicine

– Delta wave parameters ( ≥is greater than or equal to 75 µV, < 2 Hz, > 20% of epoch) and clinical importance.

REM sleep accounts for 20% to 25% of sleep time, occurring predominantly in the latter half of the night. This is the stage most closely associated with vivid, narrative dreaming.

At least 20% of a 30-second epoch must consist of Delta waves ( ) with amplitudes

Final summary emphasizing sleep staging as a vital window into brain health. It does not

Also known as Slow Wave Sleep (SWS). Dominated by high-amplitude, low-frequency Delta waves National Institutes of Health (.gov) 3. REM (Rapid Eye Movement) Sleep

Absence of muscle atonia during REM sleep; patients physically act out vivid dreams. Slide Creation Tips for Your PPT

For sleep staging, a modified version of the International 10-20 system is utilized. The American Academy of Sleep Medicine (AASM) recommends specific electrode placements to capture frontocentral, central, and occipital brain activity. Excellent for detecting high-amplitude slow waves. Central ( C3cap C sub 3 C4cap C sub 4 ): Optimal for identifying sleep spindles and K-complexes. Occipital ( O1cap O sub 1 O2cap O sub 2

Conclude by linking healthy sleep architecture to real-world pathophysiological abnormalities, demonstrating the real-world utility of EEG sleep staging.

The majority of sleep time. Characterised by unique markers: Sleep Spindles: Brief bursts of high-frequency activity ( K-complexes:

Driven by the Suprachiasmatic Nucleus (SCN), optimizing sleep timing based on light-dark cycles.