150 1913-1994 2015d-172 alexia biography biologicalevolution brain cerebral cerebraldominance cerebralhemispheres cerebrum civilization cognition cognitivescience corpuscallosum defensemechanisms efficiency etiology functionallaterality gazzaniga intellect intelligence laterality mentalprocesses michaels neuralcircuitry neuralpathways neurobiology neurodevelopmentaldisorders neurophysiology neuropsychology neurosciences neuroscientists perception physiology psychology psychophysiology roger sensorimotorintegration sperry split-brainprocedure splitbrain subconsciousness thoughtandthinking unconscious wl103b81351990 wl300 wl307p2222002 wl335n374p1982 wl705i96t1997