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Catecholaminergic manipulation alters dynamic network topology across cognitive states
James M Shine1, Ruud L van den Brink2, Dennis Hernaus3
1Department of Psychology, Stanford University, Stanford, CA, USA.
Network Neuroscience (Cambridge, Mass.)
|October 9, 2018
Summary
Brain flexibility adapts to challenges by reorganizing functional networks. Manipulating catecholamines with atomoxetine altered brain connectivity, supporting its role in cognitive resource allocation.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- The human brain exhibits remarkable flexibility in adapting information processing.
- This cognitive flexibility is associated with dynamic changes in functional brain connectivity (the functional connectome).
- Ascending catecholaminergic systems, particularly noradrenaline, are hypothesized to modulate network architecture for efficient cognitive function.
Purpose of the Study:
- To investigate whether manipulating central catecholamine levels alters functional connectome organization.
- To determine if such alterations are sensitive to cognitive demands.
Main Methods:
- Analysis of resting-state and task-based functional magnetic resonance imaging (fMRI) data.
- Comparison between conditions involving atomoxetine (a noradrenaline reuptake inhibitor) and placebo.
- Two independent human fMRI studies were conducted.
Main Results:
- Administration of atomoxetine led to significant reorganization of the functional connectome.
- The observed changes in brain connectivity were modulated by ongoing cognitive demands.
- Noradrenaline system manipulation impacts network dynamics relevant to cognition.
Conclusions:
- Central catecholamine levels play a crucial role in dynamically reorganizing the brain's functional connectome.
- This neurochemical modulation enables adaptive cognitive resource deployment.
- Findings support the hypothesis that catecholaminergic systems drive network flexibility for cognitive challenges.
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