“…In this article we test a specific version of the knowledge-change hypothesis: Gent-ner's (1988) relational shift hypothesis, later amplified into what Gentner and Rattermann (1991) called the "career of similarity" hypothesis (see also Gentner & Medina, 1996). This account posits that within any given domain (a) overall similarity is the earliest and most naturally responded to (e.g., Rovee-Collier & Fagen, 1981), and {b) the order in which partial matches come to be noticed is, first, matching objects, then matching relations, and finally matching higher-order relations.^ Our assumption is that this sequence is epistemological, not maturational: Children come to perceive similarity between objects (e.g., the likeness between a red apple and a red ball) before they perceive similarity among relations {e.g., the similarity between an apple/a/Zing from a tiee and a spoon falling from a table); and appreciation of such lower-order relational similarity in turn precedes appreciation of higher-order relational similarity (similarity in relations between relations: e.g., the similarity between a squirrel swishing its tail and causing an apple to fall from a tiee, and a toddler waving her arm and causing a cup to fall off the table).Ĝ entner and Rattermann (1991) reviewed a large body of research that supports the relational shift hypothesis in that (a) the ability to perceive relational similarity appears later than the ability to perceive object similarity, and {b) this relational insight appears at different ages in different domains (e.g.. Billow, 1975;Brown et al, 1986;Bryant & Trabasso, 1971;Chipman & Mendelson, 1979;DeLoache, 1989, in press;Gentner, 1977aGentner, , 1977bGentner, , 1988Gentner & Toupin, 1986;Goswami, 1989;Pears & Bryant, 1989;Rattermann, Gentner, & De-Loache, 1989;Smith, 1984;Uttal & De-Loache, 1995;Uttal, Schreiber, & DeLoache, 1995). In particular, when relational similarity is pitted against object similarity, younger children are more infiuenced by object matches, and less able to attend to relational matches, than are older children (Gentner, 1988;Gentiier, Rattermann, Markman, & Kotovsky, 1995;…”