One month interval is good for long-term memory.

The relationship between the interval between the first and second study and test scores six months after the second study under the condition of only one review.

• Black marker in the figure

  • The highest when the interval between the first and the second is one month.

• It depends on the question whether the higher grade is achieved by reviewing in a week or in 6 months.

  • Six months is higher for more difficult problems.
  • Either way, one month is the peak, and the spacing OR one day is lower than the other is the same.

• As test delays become multi-day, the optimal ratio approaches 0.1

• Past studies have strongly suggested that a 1-day gap is optimal, but those experiments had a TEST DELAY of 10 days or less

  • 1 month is optimal for a 6 month TEST DELAY

https://pdfs.semanticscholar.org/5d47/e8840efd5b542292ffd48db79651f5f6740f.pdf #Papers

long-term memoryinterval repetitionmemorystudy The old title was Effects of Interval Repetition Method, but the title didn’t really convey the content, so it was changed.

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