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Extremely long-term memory and familiarity after 12 years.
Christelle Larzabal1, Eve Tramoni2, Sophie Muratot1
1Université de Toulouse, UPS, Centre de Recherche Cerveau et Cognition, France; CNRS, CerCo, Toulouse, France.
Cognition
|November 3, 2017
Summary
Explicit memory, like implicit memory, can be robust to long-term decay. Participants recognized drawings seen 12 years prior, suggesting familiarity aids long-term memory retention.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Studies
Background:
- Prior research in 2006 indicated implicit memory is resistant to decay over extended periods.
- Implicit memory allows for recognition of stimuli presented years earlier, even in fragmented forms.
Purpose of the Study:
- To investigate the long-term durability of explicit memory.
- To determine if explicit memory for visual stimuli (drawings) decays significantly over a 12-year period.
- To explore factors influencing preserved explicit memory, such as stimulus presentation frequency and participant age.
Main Methods:
- 144 participants were tested on their ability to recognize drawings presented once or three times, 12 years prior.
- Stimuli were presented briefly (average 2 seconds each).
- Recognition accuracy and confidence judgments were recorded.
Main Results:
- Participants demonstrated above-chance recognition of drawings presented 12 years earlier.
- Memory preservation was more pronounced in younger participants and for stimuli presented multiple times (three times).
- Low confidence ratings were associated with recognition, suggesting a strong sense of familiarity.
Conclusions:
- Explicit memory, particularly recognition based on familiarity, can be remarkably robust to decay over a decade.
- Findings extend previous work on implicit memory decay, showing similar resilience in explicit memory.
- Familiarity plays a crucial role in long-term explicit memory retention, even when detailed recollection is absent.
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