The chimpanzee Sultan used a short stick to pull a longer stick that was out of reach into his cage. He then used the longer stick to reach a piece of fruit. Researchers hypothesized that Sultan's discovery of the solution to his problem was the result of

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The fact that Sultan used the shorter stick to get the longer stick, which he then used to reach the piece of fruit, suggests that he had a sudden realization of a solution to his problem. This sudden realization is consistent with the idea of insight. The other options, such as trial and error, heuristics, and fixation, do not fully capture Sultan's behavior in this situation.

The Chimpanzee Sultan Used a Short Stick to Pull a Longer