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1. In a given system, the return, as input, of some of the output, as a regulatory mechanism; e.g., regulation of a furnace by a thermostat. 2. An explanation for the learning of motor skills: sensory stimuli set up by muscle contractions modulate the activity of the motor system. 3. The feeling evoked by another person's reaction to oneself. See biofeedback.
negative f. that which occurs if the sign or sense of the returned signal results in reduced amplification.
positive f. that which occurs when the sign or sense of the returned signal results in increased amplification or leads to instability.
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