Before revision: History From 1880 to 1885, Hermann Ebbinghaus ran a limited, incomplete study on himself and published his hypothesis in 1885 as (later translated into English as Memory: A Contribution to Experimental Psychology).
After revision: 295x295px|The forgetting curve, with original data from EbbinghausHistory From 1880 to 1885, Hermann Ebbinghaus ran a limited, incomplete study on himself and published his hypothesis in 1885 as (later translated into English as Memory: A Contribution to Experimental Psychology).