Anthropology is the study of various aspects of humans within past and present societies. Social anthropology and cultural anthropology study the norms and values of societies. Linguistic anthropology studies how language affects social life. Biological or physical anthropology studies the biological development of humans. Archaeology, which studies past human cultures through investigation of physical evidence, is thought of as a branch of anthropology in the United States, while in Europe, it
See also: Cerebral arteriovenous malformation. Arteriovenous malformation (AVM) is an abnormal connection between arteries and veins, bypassing the capillary system. This vascular anomaly is widely known because of its occurrence in the central nervous system (usually cerebral AVM), but can appear in any location.
The REM Sleep Stage. REM sleep is the second type of sleep, often kicking in only after a full cycle of NREM sleep. This is the stage where most dreaming occurs. REM is sometimes called paradoxical sleep because brain scans of people who are in REM show that their brains are very active, despite the fact theyâre fast asleep. However, while your brain is active, only your eyes can move. There are exceptions though.