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The percentages of optimal responses for each trial type in the last session completed by each macaque in each phase of Experiment 2. Each bar indicates a different trial type with its own optimal first response - Reveal Sample responses made to Occluded Sample trials; Reveal Comparisons responses made to Revealed Sample trials; direct matching responses made to Revealed Sample-Revealed Comparisons trials; Reveal Sample responses made to Occluded Sample-Revealed Comparisons trials.
