Word: lexigram
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Dates: during 1978-1978
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...then led back by a researcher (who did not know the container's contents). The other chimp quickly eyed the sealed container but had no idea what was in it either. The returning chimp would then press the appropriate button on the console, which would flash the lexigram for the food on the screen. If the other chimp understood and identified what he saw by also pressing the correct button, both chimps would be rewarded with the food. In one series of trials, Sherman and Austin got the message (and the snack) across to each other...
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