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Illustration of stimuli used in the matching task. On Standard trials (a), one of the choice stimuli matched the sample exactly, in both number and cumulative surface area, whereas the other choice stimulus did not match in either number or cumulative surface area. On Probe trials (b), one choice stimulus matched the sample in number, but not in cumulative surface area, whereas the other choice stimulus matched the sample in cumulative surface area, but not in number.
