p501fig13.25 When an unbiased transducer is embodied by a finite rate physical process, mass action by a chemical transmitter is the result.<BR>||  Unbiased transducer (Grossberg 1968).  S=input, T=output, ?SB?=SB B is the gain.  Suppose T is due to release of chemical transmitter y at a synapse:  release rate T = S*y (mass action); Accumulation y ~= B.