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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Cognition. 2017 Jun 13;166:398–406. doi: 10.1016/j.cognition.2017.06.009

Fig. 1. Monkeys studied two images, one by touching it and one by classifying it, and were then tested for their memory of the touched image.

Fig. 1

a. Screens from an example trial. Monkeys initiated trials by touching a start square. They saw an image in the center of the screen and had to touch it to progress. After an unfilled delay, they then saw another image in the center of the screen and had to classify it as a bird, fish, flower, or person by touching one of the four associated symbols in the corners. Incorrect classification caused trials to abort. At test, monkeys saw the touched image, the classified image, and two unstudied distractors. Selecting the touched image earned food, whereas touching any other test image earned a time-out. b. Schematic of different probe and control trial types. Relative timing of touched (medium green) and classified (light blue) images is indicated by placement on the arrow. Quadrants at test indicate tested image types (dark red = distractor).