Review 4.Additive activation models 衣，=-4x,+∑S,(y)ni+1, 立，=-A,y,+∑S,(x)m,+J Hopfield circuit: i=1 1.Additive autoassociative model; 2.Strictly increasing bounded signal function (S>0); 3.Synaptic connection matrix is symmetric(M=M). Cx=R+s,m,+4.Additive activation models   = = = − + + = − + + n i j j j i i ij j p j i i i j j ji i y A y S x m J x A x S y n I 1 1 ( ) ( )   Hopfield circuit: 1. Additive autoassociative model; 2. Strictly increasing bounded signal function ; 3. Synaptic connection matrix is symmetric . (S  0) ( ) T M = M = − + + j j j ji i i i i i S x m I R x C x ( ) Review