Proc ISSS, 36, Denver CO, 1993
To show how a multiplier element works as a regulator in feedback loop and how to use the tools of Volterra systems to analyze the mechanism.
Unlike negative feedback systems, a multiplier feedback system does not use a subtractor to generate the difference between a set point and the actual reading as an error signal for regulation, instead it has a multiplier which modulates the stimulus. When the state of the system reaches satiation the feedback multiplicand reaches a near zero value so that any new arbitrary stimulation will be highly attenuated and therefore will not be strong enough to trigger action. Comparing with negative feedback, a stimulus has to be modeled and subtracted within the system in order to simulate no action.