“…Piaget (1954) provided the classic example of this ability in his observation that an infant will search for a hidden object at the location at which it had been previously found, despite seeing the object being hidden at a different location (the Stage IV, A not B error). This result has spurred a great deal of research focusing on the child's conception of objects (e.g., Baillargeon, 1987;Baillargeon, DeVos, & Graber, 1989;Baillargeon & Graber, 1988;Bower & Paterson, 1971;Evans & Gratch, 1972;Gratch, Appel, Evans, LeCompte, & Wright, 1974;Gratch & Landers, 1971) and the child's spatial knowledge (e.g., Aymed & Ruffman, 1998;Benson & Uzgiris, 1985;Bremner, Knowles, & Andreasen, 1994;Butterworth, 1976Butterworth, , 1977Hofstadter & Reznick, 1996;Lucas & Uzgiris, 1977;Smith, Thelen, Titzer, & McLin, 1999). Piaget (1954;Flavell, 1963) assumed that failures in finding this object indicated the limited nature of the child's conception of objects.…”