After viewing ftp://ftp.sas.com/pub/neural/FAQ.html#A_kinds, I wonder   
   if ANN could be classified as analog, digital and mixture? A neuron is   
   digital neuron if its activation function is a step function,   
   otherwise it is called analog neuron if its activation function is   
   continuous such as typical sigmoid function. If all of the nodes are   
   digital the network is called digital network, if it contains both   
   analog and digital neurons it is called mixture ANN. Analog ANNs such   
   as MLP are good at function interpolation, digital ones such as   
   recurrent and dynamics do others such as logic operations?   
      
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