Cingulum microstructure predicts cognitive control in older age and mild cognitive impairment
Claudia Metzler-Baddeley1, Derek K Jones, Jessica Steventon
1Cardiff University Brain Research Imaging Centre-CUBRIC, School of Psychology, and the Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff CF10 3AT, United Kingdom.
Summary
Cognitive control relies on specific white matter connections within the cingulum. Microstructure in the left anterior cingulum impacts rule-based control, while right anterior cingulum and posterior connections are crucial for spatial rule maintenance, especially in mild cognitive impairment.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Cognitive control enables flexible responses to changing demands.
- The prefrontal cortex, particularly the anterior cingulate cortex, is a key node in cognitive control networks.
- The role of structural white matter connections in cognitive control remains under-explored.
Purpose of the Study:
- To investigate the relationship between cognitive control and white matter microstructure within the cingulum bundle.
- To explore anatomical segregation and functional specialization of white matter connections in cognitive control.
- To examine these relationships in healthy controls and individuals with amnestic mild cognitive impairment (MCI).
Main Methods:
- Diffusion MRI was used to probe white matter microstructure in vivo.
- The cingulum bundle was segmented into anterior, middle, posterior, and parahippocampal portions using deterministic tractography.
- Participants (20 healthy controls, 25 MCI) underwent cognitive testing assessing cognitive control.
Main Results:
- Microstructural variation in the left anterior cingulum correlated with verbal/symbolic rule-based control.
- Errors in spatial rule maintenance tasks were linked to MCI and right anterior cingulum microstructure.
- Cognitive control in MCI was also associated with posterior parahippocampal connections.
Conclusions:
- Specific white matter connection subpopulations are critical for cognitive control.
- The study reveals fine-grained anatomical specializations within the cingulum's white matter infrastructure.
- These findings highlight the importance of white matter integrity for cognitive function, particularly in early stages of cognitive decline.
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