Figure 1.

(a) Correlation between the average latency to initiate a trial (LatI) and the order of trials during a session (the first and the second sessions of a condition are analysed together). LatI increased significantly across the session in the hiding, accumulation and partner conditions. No correlation between LatI and the order of trials was observed in the control condition. (b) Correlation between the average latency to take and eat the less preferred food (LatT) and the order of trials during a session (the first and the second sessions of a condition are analysed together). No correlation between LatT and the order of trials was observed in any condition.