Eeg And Sleep Physiology Ppt -
[ WAKEFULNESS ] Ascending Reticular Activating System (ARAS) - Acetylcholine (PPN/LDT) - Norepinephrine (Locus Coeruleus) - Serotonin (Raphe Nuclei) - Histamine (TMN) - Orexin/Hypocretin (LH) | | Ventrolateral Preoptic Nucleus (VLPO) | Releases GABA & Galanin v [ NREM SLEEP ] | | REM-On Cholinergic Neurons v [ REM SLEEP ] (Somatic Atonia + Cortical Activation)
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The deepest stage of sleep. EEG is dominated by delta waves ( eeg and sleep physiology ppt
High frequency, low amplitude; associated with wakefulness and REM sleep. Alpha Waves (8–13 Hz): Relaxed wakefulness with eyes closed. Theta Waves (4–8 Hz): Characteristic of light sleep (N1). Delta Waves (0.5–4 Hz): High amplitude; indicative of deep, slow-wave sleep (N3). 2. The Architecture of Sleep (Sleep Stages)
Looks similar to wakefulness (sawtooth waves). Muscle Atonia: Skeletal muscles are effectively paralyzed. Rapid Eye Movements: Characteristic flicking of the eyes. Vivid dreaming and memory consolidation. 4. Neurobiology and Sleep Regulation [ WAKEFULNESS ] Ascending Reticular Activating System (ARAS)
The brain controls the sleep-wake cycle through a delicate interplay of various neurotransmitters and nuclei.
ECG for cardiac rhythm, nasal pressure transducers for airflow, and pulse oximetry for oxygen saturation. The International 10-20 System Can’t copy the link right now
Sleep is divided into five distinct stages (or four based on newer classifications) based on EEG patterns: Awake, N1 (NREM), N2 (NREM), N3 (NREM - Slow Wave Sleep), and REM. A. Wakefulness
Sleep studies (polysomnography) use EEG alongside other measurements to diagnose: Sleep Apnea Narcolepsy Parasomnias (e.g., night terrors, sleepwalking)
EEG measures the summed postsynaptic potentials of cortical pyramidal neurons. During sleep, these signals undergo characteristic changes in frequency and amplitude: Beta Waves (13–30 Hz):
– Definition of EEG, its placement in Polysomnography (PSG), history of sleep tracking.
