“…These include, for example, the use of counterfactual stimulus materials such as anomalous sentences when examining children's conditional reasoning (e.g. Hawkins, Pea, Glick, & Scribner, 1984;Roberge & Paulus, 1971) or the use of stimulus events which violate physical reality in some way when exploring infants' concepts of physical causality (e.g. Baillargeon & Devos, 1991;Baillargeon, Spelke, & Wasserman, 1985;Bullock & Gelman, 1979;Poulin-Dubois et al, 1996).…”