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According to Reflex

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.

Is the magnitude, direction, etc. of this response evaluated somewhere in some type of neurons? Is there information processing in relation to, for this type of stimulus magnitude, it's evaluated which magnitude of response should be triggered by a neuron, or does the stimulus simple activate a neural pathway which activates a fixed response and the difference in the response is the result of how many neural pathways the stimulus activate?

To make an analogy, does reflexs work like turning several light switches for more or less light, or like inputing data into a program for different kind of responses?

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