What was Ebbinghaus' major contribution to the study of memory?

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Ebbinghaus' major contribution to the study of memory was providing behavioral evidence that short-term memory (STM) and long-term memory (LTM) are distinct. He conducted experiments on himself to study the nature of memory and found that information in STM is quickly forgotten, while information in LTM can last for years. He is also famous for discovering the "forgetting curve," which shows how information is rapidly forgotten in the first few days after it is learned, but then levels off.

What Was Ebbinghaus' Major Contribution to the Study of Memory