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An overview of the matching-to-sample (MTS) task. An illustration of the matching-to-sample testing procedure. In a) subjects orient to the sample image by contacting it with a joystick-controlled cursor. After this (b), two comparison images appear. The image on the left is the target, as it matches the sample. Selecting it is the correct response and is followed by a food reward. Selecting the image on the right (the foil) is incorrect and is not followed by a food reward.
