Remembering a childhood memory when a photograph of one is put in front of you is called “recognition.†Being able to draw or describe that memory when no image is present to prompt you is called “recall,†a more sophisticated process. A 2011 study published in Current Biology demonstrated that, like humans, monkeys also possess the capacity for both kinds of memory, and that it works in ways more similar than previously thought.
Study authors Benjamin M. Basile and Robert R. Hampton trained rhesus monkeys to see and reproduce simple shapes on a touch screen computer. They found that recall in humans and primates may have been an adaptive trait before human and rhesus lineages split from a common ancestor, and that monkey recall paralleled that of humans.
The first test to be developed for monkeys for distinguishing between recognition and recall had five rhesus monkeys presented with three boxes drawn on a grid. After a delay, they were shown the grid with only one box marked and the monkeys had to “draw†the remaining boxes by touching the correct coordinates on the grid, completing the image. Like humans, the monkeys had a more difficult time remembering shapes in recall tests than in recognition tests. Also like humans, this recall (once established) deteriorated more slowly over time than recognition. It wasn’t just rote learning either; the monkeys were also able to recall novel shapes that they were not trained with. --
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