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Fig. 4. Choice data, expressed as a proportion, for each of 18 successive
choice-trials. Naïve locusts were allowed to choose between two scented
arms (lemon grass or peppermint), one containing four pieces of wheat, the
other containing one piece of wheat. A total of 12 locusts was observed, and
for each locust the odour/reward combination remained constant for the first
nine trials (six locusts had lemon grass paired with the high reward; six had
peppermint paired with the high reward). At the 10th trial, the odour/reward
combinations were reversed. Data are also presented for the positive rewards
combined. For choice-trials 10-18, choosing correctly would be indicated by
small values. The dotted line indicates indifference to the positive and
negative rewards.
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