Fig. 3

Proportion correct on in-class questions as a function of question type. Prequestion denotes questions asked at the beginning of class, postquestion denotes the same questions repeated at the end of class, and new question denotes new, never-before-seen questions from the same lessons asked at the end of class. Horizontal line denotes chance performance on the prequestions. Error bars represent standard errors. ***p < 0.001; NS not significant