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Trial progression of a MTS trial. The macaques were required to first touch the sample picture three times to ensure they are oriented towards the sample picture. Then the match and foil pictures appear in a triangular configuration. If the macaques choose the matching picture, they are given a food reward and have to wait 2 s until the next trial. If they choose the foil, they obtain no reward and have to wait 8 s until the next trial.
