hat could recognize some patterns, but were limited in
             their learning abilities because of hardware limitations. In the 1990's computer simulations
             of brain functions are gaining respect as the simulations increase their abilities to predict
             the behavior of the nervous system. This respect is illustrated by the fact that many
             neurobiologists are increasingly moving toward neural network type simulations. One such
             neurobiologist, Sejnowski, introduced a three-layer net which has made some excellent predictions
             about how biological systems behave. Figure 2 illustrates this network consis
             ...