Throughout the course of history it has always been noted that any ideas about brain function depended upon the highest technological model of the day. Hence, in the Greek or Roman era the ventricular system was singled out because of the devel opment of hydraulics. Early in this century we drew the analo gy between telephone circuits and the brain. Now it is popular to characterize neural function as that of a sophisticated com puter. Indeed, in many ways it may be. But, as yet, the pre pared human brain will likely prevail in the sorting out of information necessary for a proper diagnosis....