p545fig15.11 The adaptive weight, or LTM trace , zi learns from the US input I_US at times when the sampling signal f(xi)*yi is on.  It then gates the habituative sampling signal f(xi)*yi to generate a doubly gated response f(xi)*yi*zi.<BR>||  Associative learning, gated steepest descent learning (Grossberg 1969).  d[dt: zi] = E*f(xi)*yi*[-zi + I_US], E-term read-out of CS gated signal, []-term read-out of US.  Output from each population:  f(xi)*yi*zi doubly gated signal.