Nicholas Thompson wrote: > What about the flow in the opposite direction? Can the calculus tell > us anything about how we think about goal direction in human behavior? Well, goal direction means having some way to measure achieving a goal or getting closer. One artificial neural net training algorithm, backpropagation uses adjustments to signal weights based on a the derivative of the `closeness' to the observed variables. Neural nets are one way to implement control systems in robots, e.g. a goal like "pick up the rock".
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