Microstructure of frontoparietal connections predicts cortical responsivity and working memory performance
A Z Burzynska1, I E Nagel, C Preuschhof
1Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany. burzynska@mpib-berlin.mpg.de
Cerebral Cortex (New York, N.Y. : 1991)
|February 26, 2011
Summary
White matter tract integrity, specifically the superior longitudinal fasciculi (SLF), is linked to better working memory performance and brain activity. This suggests brain connectivity influences cognitive abilities.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Working memory (WM) relies on frontoparietal networks.
- The microstructure of white matter tracts may influence neural communication and cognitive function.
Purpose of the Study:
- To investigate the association between white matter microstructure and working memory performance.
- To explore the relationship between white matter integrity, cortical responsivity, and working memory capacity.
Main Methods:
- Diffusion tensor imaging (DTI) and functional magnetic resonance imaging (fMRI) were used in 29 young adults.
- Cortical responsivity was measured as the blood oxygenation level-dependent (BOLD) signal difference during a 2-back task (3-back vs. 1-back).
- Fractional anisotropy (FA) of the superior longitudinal fasciculi (SLF) was used as an index of white matter integrity.
Main Results:
- Higher SLF integrity correlated with better performance on the 3-back task.
- SLF integrity was associated with greater task-related BOLD responsivity in the frontoparietal network.
- BOLD responsivity in the right premotor cortex mediated the relationship between SLF integrity and 3-back performance.
Conclusions:
- The microarchitecture of white matter connections influences cognitive performance, such as working memory.
- Properties of anatomical connections, like SLF integrity, may modulate local neural processing and signal transduction speed.
- Brain connectivity impacts the efficiency of neural communication, affecting cognitive abilities and brain activity patterns.
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