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Maturation of medial temporal lobe response and connectivity during memory encoding
V Menon1, J M Boyett-Anderson, A L Reiss
1Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305-5719, USA. menon@stanford.edu
Brain Research. Cognitive Brain Research
|August 27, 2005
Summary
Brain region maturation in children and adolescents shows that medial temporal lobe (MTL) activation decreases with age. However, its connectivity with the prefrontal cortex (PFC) strengthens, improving memory encoding strategies.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Cognitive Neuroscience
Background:
- The medial temporal lobe (MTL) is crucial for memory encoding.
- The developmental trajectory of MTL function and its network interactions during childhood and adolescence remains unclear.
Purpose of the Study:
- To investigate the age-related changes in MTL activation and functional connectivity during memory encoding in children and adolescents.
- To explore the relationship between MTL maturation and prefrontal cortex (PFC) interactions in memory development.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to assess brain activity.
- Effective connectivity analysis examined the directed influence between brain regions.
- Participants included children and adolescents encoding outdoor visual scenes.
Main Results:
- Medial temporal lobe (MTL) activation during memory encoding decreased with increasing age.
- Connectivity between the MTL and the left dorsolateral prefrontal cortex (PFC) significantly increased with age.
- These findings suggest distinct maturation patterns for local MTL processes and distributed network interactions.
Conclusions:
- Memory encoding involves dissociable maturation of local MTL processes and distributed network communication.
- Enhanced functional coupling between the MTL and PFC may support the development of sophisticated memory encoding strategies in youth.
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