Final answer:
Hermann Ebbinghaus was a pioneer in the research on forgetting during the late 1800s. He conducted experiments on himself and discovered the forgetting curve, which shows how memory for new information decays over time.
Step-by-step explanation:
In the late 1800s, the pioneer in research on forgetting was Hermann Ebbinghaus. He conducted experiments on himself where he memorized lists of nonsense syllables and then measured how much he retained over time. This led to his discovery of the forgetting curve, which shows that memory for new information decays quickly and then levels out. Ebbinghaus' work on storage decay has had a significant impact on our understanding of forgetting.