Organic brain syndrome , also known as organic brain disease ,
organic brain damage , organic brain disorder , organic mental
syndrome , or organic mental disorder , refers to any syndrome or
disorder of mental function whose cause is alleged to be known as organic
(physiologic) rather than purely of the mind. These names are older and nearly
obsolete general terms from psychiatry, referring to many physical disorders
that cause impaired mental function. They are meant to exclude psychiatric
disorders (mental disorders).