 In Hartley’s account, at birth we enter the world already humming with “originally automatic” motions. Thanks to the activity of our brain and nerves, these motions are self-regulating and homeostatic, responsive to bodily feedback and external stimuli. Then, as we grow, we gain voluntary control over some of our movements, perfect those that become secondarily automatic, and learn to carry out decomplex actions that draw on repertoires of secondarily automatic components.