ABSTRACT
For some fifty years Piaget was saying that the process of perception does not seem feasible unless we assume that the perceiver has some prior structure to which he can assimilate his sensory experience. Though there are empirical findings that corroborate this hypothesis, it draws its strength from the epistemological foundation on which Piaget has built his entire theory of cognition. The notion that what we come to know is to a large extent selected and shaped by what we already know, has cropped up independently in the philosophy of science.
