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Diagram of the experimental design. To avoid order effect, one individual (Sat) started with the UIR task, the other two (Bai and Dru) with the FIR task. As the number of available familiar individuals was limited, the number of trials differs between the UIR and FIR tasks. In the FIR task, the number of trials also differs according to the sex of the subject (see Procedure section for details).
