PHGY 209 Lecture Notes - Lecture 31: Non-Rapid Eye Movement Sleep, Cerebral Cortex, Grey Matter
21 Feb 2018
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Document Summary
Level of arousal (awake, asleep, etc. : measured by behavior and brain activity. Mainly measures activity of neurons located near the scalp in the gray matter of the cortex: amplitude is related to synchronous neural activity. 8 or more electrodes are placed on the head to measure the voltage fluctuations caused by the neurons of the cerebral cortex. When you are awake, the eegs have a low amplitude and fast frequencies (alert). When you sleep, you first enter nrem sleep in which the eeg starts to change. They go from low amplitude high frequencies to high amplitude low frequencies over a 30-45minute period. Afterwards, the eeg progresses from stage 4 to. Paradoxical sleep eeg has low amplitude and high frequencies. They look alike to when you are awake; thus this is when you are dreaming. After a while, you repeat the cycle that occurred when you originally fell asleep. The more rem cycles you enter, the longer the stages last.
