ABSTRACT
Categorisation research is Janus-faced, with two orientations that rarely look at one another. One side is busy developing and testing algorithms for human classi®cation that are presumed to be domain general (Ashby, 1992; Kruschke, 1992; Nosofsky, 1992), paying scant attention to the possibility that human categorisation processes differ depending on the kind of object being considered. The other side spends its time carefully documenting how categorisation differs across different object domains (e.g., Atran, 1998; Gelman, 2003), with little notice of the many well-speci®ed and rigorous domain general models of categorisation that have been proposed.
