The sequence of Petri dishes used during training.

Note each protocol pairs one odour with either reward or punishment, and the other with no reinforcer, alternating 3 times between these conditions.请注意，本实验范式（protocol）将一种气味与奖励或惩罚进行配对，另一种气味则不搭配任何强化物（reinforcer），且在上述两类条件间交替开展3次实验。