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The neocortex (Latin for "new bark" or "new rind") is a part of the brain of mammals. It is the top layer of the cerebral hemispheres, 2-4 mm thick, and is involved in higher functions such as sensory perception, generation of motor commands, spatial reasoning, and in humans, language and conscious thought. Other names for the neocortex include neopallium ("new mantle") and isocortex ("equal rind").