“…Within the rule-based categorization literature, for instance, it is typical to assume the existence of a relevant class of possible rules (Nosofsky, Palmeri, & McKinley, 1994;Ashby & Gott, 1988;Goodman, Tenenbaum, Feldman, & Griffiths, 2008;Erickson & Kruschke, 1998), and there has long been a recognition that learning involves strategic shifts in the learner's choice of hypothesis (e.g. Goodnow & Pettigrew, 1955;Levine, 1959;Brown, 1974). There has been some exploration of the hypothesis generation problem in more general contexts than categorization (see Gettys & Fisher, 1979;Gettys, Mehle, & Fisher, 1986;Koehler, 1994;Thomas, Dougherty, Sprenger, & Harbison, 2008), usually in isolation from the hypothesis testing problem.…”