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Visual stimuli used in the experiments. The 24 stimuli consisted of 6 sets of 4 stimuli. The stimuli were associated with the two outcome types as noted at the top for Monkey 1. The stimuli in the first and third columns from the left were associated with the water reward and those in the second and forth columns with the sound-only acknowledgment for Monkey 2. Differences within each set were much smaller than differences between sets.
