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our amazing ability to recognize images was illustrated in an experiment in which subjects were shown more than 600 pictures, one at a time. after ① they viewed the pictures, they were shown 68 pairs of pictures as a test. each pair contained one of the pictures from the hundreds they had previously seen. ② they were then asked to indicate which picture they had already seen and were able to do so with a 96.7 percent success rate. two hours later, researchers showed ③ them some more picture pairs. when asked which of ④ them came from the original 600 pictures, they answered correctly an astounding 99.7 percent of the time. in similar recognition tests given several days later, ⑤ they were still able to pick out the correct pictures.

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