Eeg And Sleep Physiology: Ppt ((top))

Disappearance of the alpha rhythm, replaced by low-amplitude, mixed-frequency (LAMF) activity, predominantly in the theta band (4–7 Hz).

: Prominent during drowsiness and light sleep (Stage N1).

Modern neuroscience is moving beyond simple visual stage scoring into quantitative analysis.

Large negative peaks followed by positive slow waves, often reacting to external stimuli. Stage N3 (Slow-Wave Sleep): eeg and sleep physiology ppt

The electroencephalogram (EEG) is a recording of the electrical activity of the brain. These signals originate from the summation of postsynaptic potentials in the pyramidal neurons of the cerebral cortex. While we cannot see individual action potentials, EEG allows us to visualize the synchronized activity of millions of neurons, giving us a "big picture" view of brain function.

The EEG records the electrical activity generated by the synchronous firing of thousands of cortical neurons. Electrodes placed on the scalp amplify these microvolt-level signals, translating them into wavy line patterns that reveal the functional state of the brain.

: Sharp, synchronous, irregular deflections in the EOG leads. Large negative peaks followed by positive slow waves,

Transition from alpha to theta waves. Slow eye movements are common. C. NREM Stage 2 (N2) - Deeper Sleep

NREM sleep is split into three stages, representing progressively deeper sleep.

Phasic REM is marked by bursts of eye movements and muscle twitches; tonic REM is the quiet interval between these bursts. Summary Table for Presentation Slides While we cannot see individual action potentials, EEG

Dominated by high-voltage, low-frequency Delta Waves (0.5–2 Hz) with an amplitude greater than 75 microvolts (

: A side-by-side graphic of Alpha vs. Delta waves.