In one of my past essays I talked about the importance of the communication between neurons, as well as that amongst larger boxes. Through the notion of a corollary discharge, that communication is making more sense, and becoming more concrete. Along with sensory inputs, motor outputs, CPGs, etc., our original idea of the brain(nervous system) equalling behavior is becoming more convincing. In terms of the CD itself helping us to understand behavior, I think one of our best examples has been the phantom limb phenomenon. The whole fact that a person can be receiving no sensory inputs(in this case because the limb doesn't even exist!) and yet report that the limb is there, and even report that it is in an uncomfortable position, is just fascinating to me. It is due to these internal communications I spoke of earlier that allows for this. The CPG sends the message that it has told the "limb" to move, and the CD receives that message. But when nothing comes back saying that it agrees with what the CD thinks should be the input, something is wrong, and for the CD to say that something is wrong, it sends out a signal of pain(which is why they report discomfort). This is all well and good, but how does it help explain behavior? Well, I think the phantom limbs show a good example of the connections and communications within the nervous system. And, because we understand that everyone's nervous system is different, it makes sense that these communications and connections would be different. So, if given the same exact situation or even to develop in the same environment, two people would not report having the same exact experiences, due to this CD difference. Once we begin talking about autonomy, choice, and the I-funcion, the issues become more cloudy. I think it is altogether possible to explain both autonomy and choice using the CD, but I would like to see how the I-function interacts with the CD(even though I know we said you don't need it to explain many behavioral observations). So, CD helps explain behavioral differences between people and the behaviors that arise with no sensory inputs. But where does that I-function come in?

Glad you like CD's (obviously, so do I). Be a little careful though about the details of how you use the term. Strictly speaking the CD isn't what receives the signal form the CPG, but rather the signal itself, which might be received by another CPG or by some sensory structure or by ....? Maybe the I-function? Question, of course, is what is THAT? and what can IT do with the CD signal? We'll get there, maybe? PG