Answer:
Hermann Ebbinghaus
Explanation:
Hermann Ebbinghaus was one of the famous German psychologists, who proposed the experimental study related to memory and therefore known for his great discovery of the spacing effect and the forgetting curve.
Forgetting: In psychology, the term forgetting refers to the decrease in the capability of an individual's brain to maintain a piece of memory or information over time. The forgetting curve explains that an individual tends to lose memory overtime related to learned knowledge unless he or she revises that knowledge consciously over time.
