Eeg And Sleep Physiology Ppt !!better!! Info

Sleep is regulated by a delicate balance between wake-promoting and sleep-promoting neurotransmitters. The ascending reticular activating system (ARAS) in the brainstem is critical for maintaining wakefulness via acetylcholine, norepinephrine, and serotonin. Conversely, the ventrolateral preoptic nucleus (VLPO) in the hypothalamus promotes sleep by inhibiting these arousal centers using GABA and galanin.

Sharp, high-voltage negative deflections followed by a slower positive component, lasting at least 0.5 seconds. They protect sleep by suppressing cortical arousal to non-threatening environmental noises. Non-REM Stage 3 (N3): Deep / Slow-Wave Sleep (SWS)

Visual: Diagram of a human head illustrating the anatomical positions of the International 10-20 system ( eeg and sleep physiology ppt

This stage represents "true" sleep. The EEG is characterized by Sleep Spindles (brief bursts of 11–16 Hz activity) and K-complexes

Prominent in the occipital region when a person is awake but relaxed with their eyes closed. Sleep is regulated by a delicate balance between

: Seen during relaxed wakefulness with eyes closed. Theta (4–7 Hz) : Predominant in light sleep (N1).

Marked by Sleep-Onset REM Periods (SOREMPs), where a patient bypasses NREM stages and drops directly into REM sleep within minutes of falling asleep. Presentation Design Tips for "EEG and Sleep Physiology" The EEG is characterized by Sleep Spindles (brief

Electroencephalography (EEG) uses electrodes on the scalp to detect tiny electrical signals produced by brain activity. Neurotech EEG Frequency (Hz): The number of waves per second. Amplitude ($\mu$V): The height/strength of the waves. Key Waveforms: is greater than 13 Alert wakefulness. Relaxed wakefulness with eyes closed. Light sleep or drowsiness. is less than 4 Deep, slow-wave sleep. National Institutes of Health (.gov) 2. NREM (Non-Rapid Eye Movement) Sleep

Explain why we monitor these patterns. EEG can help diagnose:

Formerly divided into Stages 3 and 4, N3 is now defined as sleep where account for more than 20% of the epoch. It is extremely difficult to wake an individual from N3; if woken, they will be groggy and disoriented (sleep inertia). This stage is predominant in the first half of the night and is associated with restorative functions, such as tissue repair, growth hormone release, and glymphatic clearance of metabolic waste from the brain.