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Brain Oscillations: Default Patterns of Sleep

Brain Oscillations>

Mind Map branch: Brain Oscillations: Default Patterns of Sleep Brain Oscillations: Default Patterns of Sleep Stage I Alpha reduces, theta increases Stage II Appearance of sleep spindles Appearance of K complexes Stage III Appearance of delta rhythms Stage IV Predominance of delta rhythms May disappear in adulthood REM Similar EEG to awake 20-25% of sleep time Muscle paralysis Link http://thebrain.mcgill.ca/flash/a/a_11/a_11_p/a_11_p_cyc/a_11_p_cyc.html Architecture review article

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Sleep is a period during which the brain is functionally separated from conscious connection to the physical environment. The brain does not rest; it continues to use oxygen and nutrients at a high rate. During this time there is consolidation of learning, enhancement of physiologic performance and a number of other activities.

Wave forms are seen easily during sleep. Stages of sleep, characterized by patterns of oscillatory activity are choreographed by the brain throughout the night.

Right: Overview of stages
Below, middle: EEG during nonREM sleep
Below, bottom: EEG during REM sleep

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