Which measure of memory did hermann ebbinghaus use to assess the impact of rehearsal on retention?

The three basic measures of memory retention are recall, recognition, and relearning. The measure of memory used by Hermann Ebbinghaus to assess the impact of rehearsal on retention was the relearning. Hermann Ebbinghaus is widely known within the world of psychology. This important psychologist and philosopher was one of the first to employ scientific methodology in the study and analysis of a higher cognitive capacity. Ebbinghaus made several contributions to the world of psychology, being especially relevant for being a pioneer in the study of memory.