Studies have provided evidence suggesting tremendous variation in brain activity during sleep. This has been demonstrated using EEG technology. Scientists have identified five distinct stages of sleep, characterized by differences in brain activity. Stages 1-4 and a final stage labeled rapid eye movement (REM) sleep. When awakened during REM sleep, subjects report dreaming. With the development of new brain imaging technology in the early 1990’s we learned even more about brain activity during REM sleep. Researchers found that certain areas of the brain are extremely active during the REM sleep state, even more active than being awake. Studies have shown that certain visual areas of the human cortex, which decode complex visual scenes, are significantly more active during REM sleep. Intense activity is also observed in the limbic system, which is a set of structures heavily involved in human emotion.
- By BryanJ / Source: The List Universe
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