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Need probability affects retention: a direct demonstration
R B Anderson1, R D Tweney, M Rivardo
1Department of Psychology, Bowling Green State University, OH 43403, USA. randers@trapper.bgsu.edu
Memory & Cognition
|January 9, 1998
Summary
Memory retention adapts to the likelihood of future testing, known as need probability. The rate of forgetting is influenced by how this probability changes over time, supporting memory
Area of Science:
- Cognitive Psychology
- Memory Research
- Learning Theory
Background:
- Recent memory theory highlights 'need probability,' the chance of recalling specific information.
- It's proposed that real-world need probability decreases over time, with memory loss rates adapting accordingly.
- This study investigates how the rate of forgetting aligns with changing need probabilities.
Purpose of the Study:
- To examine the impact of the need-probability curve's slope on the retention curve's slope.
- To determine if memory retention adapts to varying probabilities of future testing.
- To explore the relationship between memory decay and the predicted utility of information.
Main Methods:
- Participants memorized digit lists and retained them for intervals of 1 to 16 seconds.
- Trials concluded with either a recall test or a 'no test' message.
- Need probability was manipulated to increase, decrease, or remain flat across retention intervals.
Main Results:
- The shape of the need-probability curve significantly influenced the slope of the retention curve.
- This effect intensified as the experimental session progressed.
- Forgetting curves consistently followed a power function, regardless of need probability manipulation.
Conclusions:
- Memory actively adapts to predicted future needs (need probabilities).
- The rate of forgetting is demonstrably influenced by the slope of the need-probability curve.
- Need probability affects the rate of forgetting but not its fundamental mathematical form.