Harry Erwin erwin at trwacs.fp.trw.com
Tue Oct 26 07:09:26 EST 1993

Perhaps I should be a little more explicit. I'm connecting habituation
with reduced availability of Ca++ at the presynaptic terminal. This can be
due to removal of Ca++ by potentiation on the post-synaptic side or
failure of replenishment by the extracellular current returning from the
soma of the neuron. The extracellular current appears to be generated by
the release of positive ions at the axon hillock and the uptake of
negative ions at inhibitory synapses. Both processes should result in the
migration of positive ions into the dentritic arbor. This is why I doubted
that the firing of inhibitory synapses will result in habituation. I'd
like to be proven wrong here.

Harry Erwin
Internet: erwin at trwacs.fp.trw.com
          herwin at cs.gmu.edu
Working on Freeman nets....

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