p079fig02.32 Matching amplifies the matched pattern due to automatic gain control.  See terms I and J in the equation.<BR>||  Substrate of resonance. Match (in phase) of BU and TD input patterns AMPLIFIES matched pattern due to automatic gain control by shunting terms.  J = sum[i: Ji], I = sum[i: Ii], θi = (Ii + Ji)/(I + J)<BR>xi = (B + C)*(I + J)/(A + I + J)*[θi -C/(B + C)]<BR>Need top-down expectations to be MODULATORY.