Cognitive and hippocampal changes weeks and years after memory training.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Immediate effects of memory training are well-documented in various age groups.
• Long-term effects and maintenance of hippocampal plasticity following memory training remain less understood.

Purpose of the Study:

• To investigate long-term effects of episodic-memory training on memory performance and hippocampal volume.
• To examine training-dependent hippocampal plasticity across multiple intervention phases and maintenance over time.
• To compare training effects between young and older adults.

Main Methods:

• 157 healthy young and older adults participated in a training intervention.
• The intervention involved two 10-week periods of episodic-memory training, separated by two 2-week detraining periods.
• Structural MRI was used to assess hippocampal volume changes over time, with a 3-year follow-up.

Main Results:

• Both age groups showed sustained improvements in memory performance 3 years post-intervention.
• Relative increases in hippocampal volume were observed post-training and maintained after detraining periods.
• Young adults demonstrated immediate near-transfer effects on a word-association task.
• No significant difference in hippocampal volume was found between the training and control groups at the 3-year mark.

Conclusions:

• Episodic-memory training can lead to lasting improvements in memory performance.
• While memory training can induce short-term hippocampal volume increases, long-term maintenance beyond 10 weeks is uncertain and may necessitate continuous engagement.
• Training-induced hippocampal volume changes may not persist long-term without ongoing intervention.