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Olfactory guided behaviour in rat. (A) Time required by rats to find small pieces of chocolate, on the surface or beneath smoothed wood-chip bedding, in three successive trials. (B) Amount of time spent investigating a lemon-scented cylinder during repeated 1 min presentation training time in the presence of lemon alone or lemon and vanilla combination. At least 10 rats were used in each experiment. Vertical bars represent SEM.
