Akon has had more than ten songs certified as 1 × platinum in digital sales.
Paul D. MacLean -LRB- May 1 , 1913 -- December 26 , 2007 -RRB- was an American physician and neuroscientist who made significant contributions in the fields of physiology , psychiatry , and brain research through his work at Yale Medical School and the National Institute of Mental Health .. American. United States. Yale Medical School. Yale Medical School. National Institute of Mental Health. National Institute of Mental Health. physician. physician. neuroscientist. neuroscientist. physiology. physiology. psychiatry. psychiatry. brain. brain. MacLean 's evolutionary triune brain theory proposed that the human brain was in reality three brains in one  : the reptilian complex , the limbic system , and the neocortex .. triune brain. triune brain. brain. brain. reptilian complex. reptilian complex. limbic system. limbic system. neocortex. neocortex