150 1913-1994 barack biologicalevolution brain cerebral cerebralhemispheres civilization defensemechanisms dominance drawing dual-brainpsychology dual-braintherapy efficiency innerchild languageandlanguages lateraliteit laterality lateralität leadership left-andright-handedness leftandright(psychology) localizationoffunctions mentalprocesses neuralcircuitry neuralpathways neurobiology neurophysiology neuropsychology perception persoonlijkheid physiology psicofisiologia psychologicalaspects psychology psychologyobama psychologyof psychophysiology roger self-actualization(psychology) sexdifferences sperry splitbrain subconsciousness successinbusiness thoughtandthinking unconscious wl103b81351990 wl335h477h wl335n374p1982 wl705i96t1997 writing