LAUSR

We presented apes with a nonsocial control of our previously published study [11] using identical methods except that, following [6] (Figure I), stimuli were animated versions in which the human actor was swapped out for a green semicircle and the King Kong antagonist for a grey triangle. The submentalizing hypothesis predicts that, given similar attention, retrieval and contextual cueing will elicit similar anticipatory looking patterns. In the control test, apes closely tracked all key events. However, unlike in the original study, only half of the apes looked to the boxes upon the return of the green semicircle. Moreover, unlike in the original study, among those apes that did make looks to the boxes, there was no significant tendency to look first (or longer) to the correct over the incorrect box, with a notably smaller effect size. Thus, the results from the control study do not support the submentalizing hypothesis.