Physiology Ppt: Eeg And Sleep

Postsynaptic potentials of cortical pyramidal neurons.

The EEG is invaluable for diagnosing various sleep disorders:

The biological accumulation of sleep pressure. The longer you stay awake, the more adenosine builds up in the brain. Sleeping clears this adenosine, resetting the pressure. The Ascending Reticular Activating System (ARAS) eeg and sleep physiology ppt

Before falling asleep, the awake, alert brain is dominated by low-amplitude, high-frequency . When a person closes their eyes and relaxes, the EEG shifts to the more synchronized alpha rhythm over the occipital regions.

: A deep dive into the neurophysiological mechanisms, including thalamocortical oscillations and homeostatic sleep regulation models like the "two-process model". Postsynaptic potentials of cortical pyramidal neurons

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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 Sleeping clears this adenosine, resetting the pressure

Wakefulness is actively maintained by the ARAS, a network of brainstem and forebrain structures that project to the cortex. Key neurotransmitters involved include: High during wakefulness and REM sleep.

The EEG is characterized by two primary dimensions:

A healthy night of sleep consists of 4 to 6 cycles, each lasting roughly 90 to 120 minutes. These cycles shift between Non-Rapid Eye Movement (NREM) and Rapid Eye Movement (REM) sleep. A is the graph that charts these cyclic transitions across the night. Early Night: Dominated by deep, slow-wave NREM sleep. Late Night: Dominated by longer, more intense REM episodes. 4. EEG Stages of Sleep (AASM Criteria)

Frequent micro-arousals (abrupt shifts to higher EEG frequencies) often caused by Sleep Apnea or Periodic Limb Movement Disorder (PLMD).