Brain is an analogue device
Even if neuron firings are all-or-none, the message pulses that carry neural information are analogue. They involve complex graded and nonlinear factors. So the brain seems to be an analogue device.
John von Neumann (1958) as articulated by Hubert Dreyfus (1972).

Note: Von Neumann subjects the relationship between brain and computer to extensive analysis, and his classic lecutres on the subject are still relevant today.
CONTEXT(Help)
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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
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Analogue machines lack flexibility of digital machines »Analogue machines lack flexibility of digital machines
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Analogue systems can't represent general concepts »Analogue systems can't represent general concepts
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