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Fig. 6. Choice data, expressed as a proportion, for each of nine successive choice-trials. Naïve locusts were allowed to choose between two scented arms (lemon grass or peppermint), one containing p21:c21 food, the other containing p7:c7 food (see the Methods and Results section for a full description of these foods). A total of 12 locusts was observed, and for each locust the odour/reward combination remained constant over the entire experiment (six locusts had the high reward paired with green, while six had the high reward paired with yellow). Data are also presented for the positive rewards combined. The dotted line indicates indifference to the positive and negative rewards.





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