Fig. 2.
Cognitive tasks - A) Mean number of trials (±SEM) subjects required to reach criterion; B) Estimated probability (±SE) of subjects choosing the location indicated by the experimenter’s gesture, with dashed line at the level of chance (50%); C) Estimated probability (±SE) of subjects retrieving the food by navigating directly to the side opening without first touching the clear cylinder; D) Mean number of seconds (±SEM) subjects spent looking at human face during 30 second trial. For all panels, * indicates p<.05, ** indicates p<.01, *** indicates p<.001.