Figure 1: The forgetting curve described by Hermann Ebbinghaus.
Here, b represents 'Savings' expressed as a percentage, and t represents time in minutes, counting from one minute before end of learning. The constants c and k are 1.25 and 1.84 respectively. Savings is defined as the relative amount of time saved on the second learning trial as a result of having had the first. A savings of 100% would indicate that all items were still known from the first trial. A 75% savings would mean that relearning missed items required 25% as long as the original learning session (to learn all items). 'Savings' is thus, analogous to retention rate.
This site is developed from the scratch,
and operated by the Japanese Language and Culture Section,
Tokyo Institute of Technology:
programmed by Professor Hilofumi Yamamoto;
practice sentences written and data checked by Professor Fumie Wakamatsu and
Professor Hilofumi Yamamoto; and
material designed by Professor Mika Ebara and Professor Fumie Wakamatsu.
Please send your comments and bug reports to
[here].
Revision history:
2024.03.18: Basic Kanji Yomi practice, Bky starts.