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Area of Science:

  • Cognitive Psychology
  • Educational Psychology
  • Learning Sciences

Background:

  • Spaced retrieval is a proven technique for enhancing long-term memory retention.
  • Existing research primarily focuses on short spacing intervals (seconds to minutes).
  • The effectiveness of longer spacing intervals for long-term retention remains less understood.

Purpose of the Study:

  • To investigate the impact of spaced retrieval intervals (short vs. long) on long-term memory retention.
  • To compare the effectiveness of within-session (short lag) versus between-session (long lag) retrieval.
  • To examine retention over one-day and one-week intervals.

Main Methods:

  • Seven experiments involving 536 participants learning paired associates to 70% accuracy.
  • Test-feedback trials were administered either within 10 minutes (short lag) or one day later (long lag).
  • Final recall tests were conducted after one day (Experiments 1-3) or one week (Experiments 4-5).

Main Results:

  • Experiments 1-3 (one-day retention) showed minimal benefit of the long-lag schedule on final recall (no lag effect), but significant effects on retention.
  • Experiments 4-5 (one-week retention) demonstrated a clear benefit of the long-lag schedule on both final recall performance and retention.
  • The 'lag effect' in spaced retrieval reemerged at a one-week retention interval after being absent at a one-day interval.

Conclusions:

  • The effectiveness of spaced retrieval intervals is dependent on the retention period.
  • Longer spacing intervals (lag effect) become beneficial for long-term retention over extended periods (one week).
  • Findings support an extended bifurcation model of the spacing effect in memory.