An important feature of nerve transmission is that the signals are (for the most part) entirely ‘all-or-nothing’ phenomena. The strength of the signal does not vary: it is either there or it is not. This gives the action of the nervous system a digital computer-like aspect. In fact there are quite a lot of similarities between the action of a great number of interconnected neurons and the internal workings of a digital computer, with its current-carrying wires and logic gates (more about these in a moment). It would not be hard, in principle, to set up a computer simulation of the action of a
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