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Direct brain recordings reveal prefrontal cortex dynamics of memory development.
E L Johnson1,2, L Tang1,3, Q Yin1,3
1Institute of Gerontology, Wayne State University, Detroit, MI, USA.
Science Advances
|December 27, 2018
Summary
Brain activity in the prefrontal cortex (PFC) supports children's memory. Precise timing of frontal activity flow, especially between PFC regions, is crucial for forming and improving visual memory during development.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Declarative memory development is linked to prefrontal cortex (PFC) maturation.
- The exact timing and location of brain activity supporting memory formation in children remain unclear.
Purpose of the Study:
- To investigate the spatiotemporal dynamics of prefrontal cortex activity during memory formation in developing individuals.
- To provide intracranial evidence for the role of frontal activity propagation in children's memory development.
Main Methods:
- Direct cortical monitoring was used in 17 subjects (aged 6.2 to 19.4 years) studying visual scenes for a recognition memory test.
- Analysis focused on the spatiotemporal propagation of frontal activity and its correlation with memory accuracy and age.
Main Results:
- Earlier prefrontal cortex activity predicted higher memory accuracy.
- Subsecond variations in activity flow between frontal subregions were significant predictors of memory formation.
- Refinement of activity flow between inferior and precentral sites during adolescence correlated with memory improvements.
- Middle frontal activity predicted memory performance irrespective of age.
Conclusions:
- The developing prefrontal cortex plays a critical role in linking visual perception to memory formation with subsecond precision.
- Activity flow dynamics within the PFC are essential for supporting memory development throughout childhood and adolescence.
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