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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: Anim Cogn. 2008 Feb 7;11(3):467–474. doi: 10.1007/s10071-008-0137-4

Fig. 4.

Fig. 4

The mean percentage of correct responses (+sem) by subjects for discriminations of chimpanzee faces in the four orientation angles compared to upright control trials during that task session. The data for each angle of orientation represents a single 60 trial session, 30 rotated trials and the 30 upright control trials