Do all ducks lay eggs? The generic overgeneralization effect

► Generics are unquantified generalizations like “ducks lay eggs”. ► Universals, in contrast, involve the quantifier “all”. ► Adults often incorrectly judge universals like “all ducks lay eggs” to be true. ► This may be due to their interpreting the universal as a generic. ► This is predicted by the hypothesis that generics express default generalizations.