Source : Free On-Line Dictionary of Computing

Hopfield network
     
         (Or "Hopfield model") A kind of
        {neural network} investigated by John Hopfield in the early
        1980s.  The Hopfield network has no special input or output
        neurons (see {McCulloch-Pitts}), but all are both input and
        output, and all are connected to all others in both directions
        (with equal weights in the two directions).  Input is applied
        simultaneously to all neurons which then output to each other
        and the process continues until a stable state is reached,
        which represents the network output.
     
        (1997-10-11)