Chimerism is what happens when cells from one twin are present in the other. For example, white blood cells with Y chromosomes would be found in the female twin.
: of, relating to, or involving conscious mental activities (such as thinking, understanding, learning, and remembering). cognitive development/psychology/impairment. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples.
cognitive. 1  of or relating to cognition; concerned with the act or process of knowing, perceiving, etc. : cognitive development; cognitive functioning. 2  of or relating to the mental processes of perception, memory, judgment, and reasoning, as contrasted with emotional and volitional processes.