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Spacing effects in cued-memory tasks for unfamiliar faces and nonwords
Nicola Mammarella1, Riccardo Russo, S E Avons
1University of Essex, Colchester, England.
Memory & Cognition
|March 29, 2003
Summary
The spacing effect, where memory improves with item repetition intervals, is weakened when item presentation changes. This suggests short-term perceptual priming underlies this memory enhancement for unfamiliar items.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Research
Background:
- The spacing effect demonstrates that memory for repeated items improves with increased intervals between repetitions.
- This phenomenon is well-documented but its underlying mechanisms, particularly in relation to perceptual changes, require further investigation.
Purpose of the Study:
- To investigate how changes in item presentation affect the spacing effect in recognition memory and frequency judgment tasks.
- To determine if short-term perceptual repetition priming contributes to the spacing effect for unfamiliar stimuli.
Main Methods:
- Participants incidentally learned unfamiliar target faces or nonwords presented with varying intervals and poses/fonts.
- Recognition memory and frequency judgment tasks were used to assess memory performance.
- A structural discrimination task measured perceptual repetition priming.
Main Results:
- Changing the pose of faces between study repetitions reduced both perceptual repetition priming and the spacing effect.
- Altering the font of nonwords between repetitions eliminated the spacing effect in recognition memory.
- The spacing effect was consistently diminished when perceptual features of repeated items changed.
Conclusions:
- Short-term perceptual repetition priming appears to be a key mechanism underlying the spacing effect.
- The findings support a model where perceptual familiarity influences explicit memory performance for novel materials.
- Memory benefits from spaced repetitions are dependent on consistent perceptual encoding of items.