A corollary discharge is necessary in conjunction with a central pattern generator, because it seems to be the integration factor. The nervous system will always have something being generated internally. This is necessary because there is an intermediary between what is happening in the outside world and what goes on inside the brain. Already in the transmitting of information from the outside world to the inner cognitive centers of the brain there has been some sort of paradigm or "character" given to the message. The pattern in which the neurons fire, is already imparting some sort of subjective character to the message, thus when it arrives in the brain, there must be some way to begin to interpret and integrate this message. A corollary discharge is just such a signal. Because behaviour is a result of our genes and the influences that the external world exerts upon us, this integration is vital for producing some sort of output. Of the control exerted the most important is that of lateral inhibition, allowing one motor symphony to proceed, but not having discordance by having all the possible patterns occurring. In this situation, for any particular output there must only be one coordinated and integrated pattern within the individual. Thus the corollary discharge signals ensures that we are not exploding into all the realistically possible pathways. The corollary signal is what distinguishes within ourselves between actuality and possibility. It is this distinction which is vital in producing some sort of behaviour.

As humans the different regions of our brain is capable of imaging all sorts of things and communicating it to other parts of the brain. A corollary discharge relays the message and acts upon the appropriate symphony for response, whether it be the generation of another idea, or the movement of the muscles. Thus the corollary discharge is the integration unit of the mind.

A very sweeping, broad, and intriguing assertion. It is certainly true that corollary discharge signals constrain and coordinate what different parts of the brain are in principle capable of doing independently, and so in the absence of coordination among them. And that is almost certainly true not only for the clear cases of coordination among CPG's and action circuits in general, but perhaps for various more abstract thoughts and drives as well. I'm less certain what you mean by a "subjective character" in incoming signals, why this requires corollary discharge, and how it acts, but will think about that as well. PG