Is there any ecological purpose in assuming that perception foraction exists only through a global array of energy? UnlikeStoffregen & Bardy, who assume that behavior consists ofmovements, we would argue that behavior consists of a stablecoupling between perception and action achieved through experiencein an adaptive context. Determining target position in an aimingmanual task and temporal control of impact movement illustrate thatpatterns of energy used for action are task-dependent.