Together McCulloch and Pitts proved a deep theory that a group of neurons sending 1s or 0s to each other could produce all of logic. That, for example, a pair of neurons could compute AND: by both sending a spike—a 1—if both received an input, and neither sending a spike—a 0—for any other combination of their inputs. A different pair could compute OR: by each sending a spike (1) when that neuron received an input, but not sending a spike (0) if both neurons received no inputs or an input at the same time. Adding more and more neurons, McCulloch and Pitts showed, could compute all such
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