Physiology Ppt: Eeg And Sleep

: Specific frequencies act as biological markers for distinct states of consciousness.

Deep, restorative sleep. Defined by Slow Wave Activity (SWA) consisting of delta waves (0.5–2 Hz) with a peak-to-peak amplitude

: Consistently color-code your wave types across the presentation (e.g., always use blue for Delta waves and red for REM markers). This helps the audience follow along without reading every slide label.

Stage N2 forms the backbone of human sleep architecture, typically accounting for roughly 50% of total sleep time. eeg and sleep physiology ppt

The transitions between wakefulness, NREM, and REM states are controlled by the interplay of several neurochemical systems.

: Cortical responses to internal or external stimuli, representing a mechanism that keeps the cortex suppressed. Slide 7: Non-REM Stage N3 – Slow-Wave Sleep (SWS) Core Concept : Deep, highly synchronized, restorative sleep.

Sharp, negative high-voltage peaks followed immediately by a slower, positive deflection. Total duration must be ≥0.5is greater than or equal to 0.5 : Specific frequencies act as biological markers for

AASM rules dictate that these data are segmented into 30-second epochs, and each epoch is visually scored as one of the stages (W, N1, N2, N3, or R) based on the predominance of specific EEG patterns.

: Brief, sharp, diphasic potentials lasting less than 0.5 seconds, maximum over the central scalp regions near the end of Stage N1.

: Ideal for identifying sleep spindles and K-complexes. This helps the audience follow along without reading

For standardized sleep staging, the American Academy of Sleep Medicine (AASM) recommends a modified montage based on the International 10-20 System. This system uses anatomical landmarks—the (bridge of the nose), Inion (prominence at the back of the skull), and Preauricular points (front of the ears)—to map electrode placement at 10% and 20% intervals.

ECG for cardiac rhythm, nasal pressure transducers for airflow, and pulse oximetry for oxygen saturation. The International 10-20 System