premise: The human brain is set apart from mammalian brains by the size of the cerebral cortex.
hypothesis: Cerebral cortex . The cerebral cortex is composed of gray matter , consisting mainly of cell bodies ( with astrocytes being the most abundant cell type in the cortex as well as the human brain in general ) and capillaries . Human brain . It is divided into two cerebral hemispheres which are covered by the cerebral cortex .