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I was under the impression that our previous discussion on inputs and outputs was not limited to external inputs but rather, encompassed ALL inputs. Isn't input just that, regardless of where it came from? I'm curious; how would you define internal and external input? I haven't really thought of inputs in such a rigid way, but in retrospect, I suppose that my assumptions were that all inputs were external to the neuron. Again, I ask where exactly does an action potential start? Within a neuron or externally? hmm...

Thanks for your thoughts!