ABSTRACT
THE distinction between motor functions and perceptual functions is legitimate only for purposes of analysis. As von Weizsäcker1 has convincingly shown, the classical division of phenomena into sensory stimuli and motor responses, which is introduced by the reflex-arc schema, is just as fallacious, and refers to laboratory products which are just as artificial, as the idea of the reflex arc itself, conceived in isolation. Perception is influenced by motor activity from the outset, just as the latter is by the former. This is what we, for our part, have asserted when speaking of sensori-motor schemata in order to describe the simultaneously perceptual and motor assimilation which characterises the behaviour of the infant.2
