input strength -> action potentials

[Chris Coomber]

I'm looking for a reference that explains the relationship
between the strength of a pre-synaptic input and the number
of action potentials generated by the post-synaptic neuron.
References in relation to experiments with squid axons
would be most appreciated.

Can anyone help?

Thanks,
Dr Chris Coomber

Faculty of Science and Technology
Deakin University
Geelong, Victoria
AUSTRALIA 3217