[comp.ai.neural-nets] derivatives in neural nets

hubey@pilot.njin.net (Hubey) (04/30/89)

I am not familiar with work done with neural networks other than
simple knowledge that the "neurons" are connected to other neurons and
that the rules for a neuron firing is that if the "weighted average"
of the inputs to a neuron exceeds a thresh hold value it fires.

My question is;
  Have there been any models where derivatives are employed.  I
remember reading years ago (from experiments on frog brains) that
certain neurons only fire when particular patterns visual patterns
occur. Still other neurons seem to fire periodically once "set off"--
not just once.  It seems to me that this kind of phenomena are asking
for slightly more than the "cross-the-threshold & fire once" type of
models. In any case, I don't know where to start reading. If anyone
knows of different types of neural net models, I'd be grateful for the
info.  Many thanks ...

mark
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     H.M. Hubey                     VOICE: 201-893-5269
 hubey@OSultrix.montclair.edu       hubey@pilot.njin.net
 hubey@apollo.montclair.edu