Technicians score PSG data in 30-second epochs . A study typically contains hundreds of epochs, classified into Wake (W), N1, N2, N3, or REM (R) based on the majority pattern.
Human sleep is broadly divided into two distinct states: sleep and Rapid Eye Movement (REM) sleep. According to AASM guidelines, NREM is further subdivided into three stages (N1, N2, N3). A typical night consists of 4 to 5 cycles through these stages, each lasting roughly 90 to 120 minutes.
The transitions between wakefulness, NREM, and REM states are controlled by the interplay of several neurochemical systems.
Brief bursts of distinct 11–16 Hz activity (most commonly 12–14 Hz) lasting at least 0.5 seconds. They reflect thalamocortical gating mechanisms that shield the brain from external sensory input.
Measures brain electrical activity.
: Crucial for detecting the alpha rhythm during wakefulness. Note: M1 and M2 refer to the mastoid processes behind the ears, used as neutral reference points. Slide 3: Fundamental EEG Waveforms
Technicians score PSG data in 30-second epochs . A study typically contains hundreds of epochs, classified into Wake (W), N1, N2, N3, or REM (R) based on the majority pattern.
Human sleep is broadly divided into two distinct states: sleep and Rapid Eye Movement (REM) sleep. According to AASM guidelines, NREM is further subdivided into three stages (N1, N2, N3). A typical night consists of 4 to 5 cycles through these stages, each lasting roughly 90 to 120 minutes.
The transitions between wakefulness, NREM, and REM states are controlled by the interplay of several neurochemical systems.
Brief bursts of distinct 11–16 Hz activity (most commonly 12–14 Hz) lasting at least 0.5 seconds. They reflect thalamocortical gating mechanisms that shield the brain from external sensory input.
Measures brain electrical activity.
: Crucial for detecting the alpha rhythm during wakefulness. Note: M1 and M2 refer to the mastoid processes behind the ears, used as neutral reference points. Slide 3: Fundamental EEG Waveforms