Analogue machines lack flexibility of digital machines
Analogue devices can't make contingent if-then branches—ie analogue devices can't do "one thing under one set of circumstances and a completely different thing under a discretely different set of circumstances."
This limitation can be overcome by adding a discrete threshold element, but that still does not make an analogue device the best way to represent cognitive processes.

Zenon Pylyshyn (1974, p.68).
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Artificial Intelligence »Artificial Intelligence
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Can computers think? [1] »Can computers think? [1]
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Yes: physical symbol systems can think [3] »Yes: physical symbol systems can think [3]
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The Biological Assumption »The Biological Assumption
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Neurons operate like logic gates »Neurons operate like logic gates
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Brain is an analogue device »Brain is an analogue device
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Analogue machines lack flexibility of digital machines
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Zenon Pylyshyn »Zenon Pylyshyn
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