Von Neumann: The Brain: The Nature of Nerve Impulses (The Computer and the Brain, 1958)

GalvanifroescheStimulation of nerve cell is similar to two digital markers: 0 in the absence, 1 in the presence, of electrical impulse. This is a high level description of the more conspicuous aspects of nerve impulses—with nuance, the digital qualities are less clear.
“Natural componentry favors automata with more, but slower, organs, while the artificial one favors the reverse arrangement of fewer, but faster organs.” Thus “the human nervous system will pick up many logical or informational items, and process them simultaneously,” while a computer “will be more likely to do things successively. . . or at any rate not so many things at a time.” The nervous system is parallel, while computers are serial. But the two cannot always be substituted for one another—some calculations must be done serially, the next step must follow the one previous to it, while other calculations done parallel, to be done serially require immense memory requirements.
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