Related Experiment Video
Updated: Dec 8, 2025
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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
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Reminders activate the prefrontal-medial temporal cortex and attenuate forgetting of event memory
Melanie J Sekeres1,2, Morris Moscovitch2,3,4, Gordon Winocur2,4,5,6
1School of Psychology, University of Ottawa, Ottawa, Ontario, Canada.
Hippocampus
|September 23, 2020
Summary
Reminders enhance memory retrieval for forgotten events by reactivating brain networks. This suggests memory loss after a week is often a retrieval issue, not a storage problem.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Memory Research
Background:
- Reminders can improve memory recall, but their neural underpinnings are not well understood.
- Investigating the brain activity during memory reactivation is crucial for understanding memory enhancement.
Purpose of the Study:
- To examine the neural basis of memory enhancement by reminders one week after event encoding.
- To differentiate neural activity between reactivated and non-reactivated memories using fMRI.
Main Methods:
- Utilized functional magnetic resonance imaging (fMRI) to observe brain activity.
- Compared neural networks associated with recently reactivated memories versus non-reactivated memories after a 7-day delay.
- Analyzed the temporal sequence of brain region activation during the reminder process.
Main Results:
- Reminders effectively boosted the overall retrieval of film clip memories in an all-or-none manner.
- Activation in ventro-lateral prefrontal cortex (vPFC) preceded hippocampal activation during reminders.
- Reminders did not improve the quality or detail of retrieved memories, indicating a retrieval rather than storage deficit.
Conclusions:
- Reminders facilitate the retrieval of episodic memories that would otherwise be inaccessible.
- The findings support the role of the ventro-lateral prefrontal cortex (vPFC) in driving hippocampal activation for memory retrieval.
- The temporal dynamics suggest reminders engage schematic information via vPFC, followed by hippocampal recollection.
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