Behavioral and Brain Sciences

Short Communication

Rules work on one representation; similarity compares two representations

Todd M. Bailey a1
a1 School of Psychology, Cardiff University, Cardiff CF10 3YB, United Kingdom


Rules and similarity refer to qualitatively different processes. The classification of a stimulus by rules involves abstract and usually domain-specific knowledge operating primarily on the target representation. In contrast, similarity is a relation between the target representation and another representation of the same type. It is also useful to distinguish associationist processes as a third type of cognitive process.