Cognitive Flexibility through Metastable Neural Dynamics Is Disrupted by Damage to the Structural Connectome
Peter J Hellyer1, Gregory Scott2, Murray Shanahan3
1Computational, Cognitive, and Clinical Neuroimaging Laboratory, Division of Brain Sciences, Faculty of Medicine, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, United Kingdom, Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, London SE5 8AF, United Kingdom, and.
Summary
Traumatic brain injury disrupts brain metastability, impacting cognitive functions like flexibility and processing speed. This study links brain network damage to these cognitive deficits, offering insights into brain function and recovery.
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Neuroscience
Background:
- Healthy brain function relies on metastable neural dynamics, balancing integration and segregation for cognitive flexibility.
- Neural dynamics are shaped by structural brain connectivity, which can be disrupted by conditions like traumatic brain injury (TBI).
- TBI causes widespread axonal damage, impairing large-scale brain networks and leading to cognitive deficits.
Purpose of the Study:
- To investigate the relationship between structural brain connectivity, neural dynamics, and cognitive performance after TBI.
- To understand how TBI-induced structural damage affects neural metastability.
- To explore the consequences of altered metastability on cognitive functions such as information processing speed and flexibility.
Main Methods:
- Utilized resting-state functional MRI to measure large-scale neural dynamics and metastability.
- Employed diffusion MRI to quantify structural connectome damage.
- Developed a computational model using empirical connectivity data to simulate neural dynamics.
Main Results:
- Reduced neural metastability was observed in individuals with TBI compared to healthy controls.
- Decreased metastability correlated with the extent of structural connectome damage.
- Lower metastability was associated with impairments in cognitive flexibility and information processing speed.
Conclusions:
- TBI significantly disrupts neural metastability, which is contingent upon the integrity of the structural connectome.
- Altered metastability following TBI is a key mechanism underlying observed cognitive deficits.
- Findings highlight the critical role of metastable dynamics in normal brain function and cognition.
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