the sbi graveive action of the nervous system means sensory information is come in, it's processed to give rise to a variety of movements. this not only applies to motor systems, it applies to every aspect of nervous system function. there is xi station of appropriate movements, inhibition of inappropriate movements. this is a brilliant peres yent set of insight wes owe to sherrington. we're still living in a sherringtonian world today. >> rose: we talk about and touch on all these things we have been talking about. eric and i have assembled a group of people i think you will find extraordinary in terms of their insight and how they can demonstrate what we are talking about. because we're talking about motor functions, what you can see. you will also discover as you listen to them that there is a remarkable thing that is coming out of this, insight into how the brain functions in its highest level. so we begin with understanding the significance of the motor system. >> well, i think we have to ask a very fundamental question, perhaps the most fundamental question we can ever ask and i