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The expression of established cognitive brain states stabilizes with working memory development
David Florentino Montez1,2, Finnegan J Calabro1,2,3, Beatriz Luna1,2
1Department of Psychiatry, University of Pittsburgh, Pittsburgh, United States.
Elife
|August 23, 2017
Summary
Adolescent cognitive development, specifically working memory, improves as brain activity becomes more stable. This study tracked 126 individuals for 10 years, linking brain state variability to cognitive maturation.
Area of Science:
- Neuroscience
- Cognitive Science
- Developmental Psychology
Background:
- Adolescence is a critical period for cognitive maturation.
- Working memory development is crucial for higher-order cognitive functions.
- Understanding the neural mechanisms underlying cognitive development is essential.
Purpose of the Study:
- To investigate the relationship between brain activity variability and working memory development during adolescence.
- To examine how neural gain signals change during adolescent cognitive maturation.
- To link behavioral variability in cognitive tasks to neural variability.
Main Methods:
- Longitudinal study over 10 years with 126 participants (aged 8-33).
- Functional magnetic resonance imaging (fMRI) to analyze brain activity.
- Behavioral assessments using a memory-guided saccade task to measure reaction time and accuracy.
Main Results:
- Decreased variability in task-related brain states supports working memory development.
- Neural gain signals related to working memory stabilize during adolescence.
- Behavioral variability (reaction time, accuracy) correlates with brain state variability.
Conclusions:
- Stabilization of neural gain signals is a key mechanism for cognitive maturation during adolescence.
- Reduced brain state variability is associated with improved working memory function.
- Individual differences in cognitive development trajectories mirror changes in neural variability.
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