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Systems level modeling of a neuronal network subserving intrinsic alertness
Felix M Mottaghy1, Klaus Willmes, Barry Horwitz
1Department of Nuclear Medicine H-H-U, Düsseldorf and KME, Research Center Jülich, Germany.
Neuroimage
|August 30, 2005
Summary
This study reveals the right hemisphere
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Brain Imaging
Background:
- Intrinsic alertness, the cognitive control of alertness in unwarned situations, is managed by a right-hemisphere network.
- Previous research identified key brain regions including the anterior cingulate cortex, prefrontal cortex, parietal cortex, thalamus, and brainstem.
Purpose of the Study:
- To investigate the effective connectivity within the neural network responsible for intrinsic alertness.
- To elucidate the functional relationships between brain regions involved in maintaining alertness.
Main Methods:
- Employed structural equation modeling (SEM) to analyze functional brain network connectivity.
- Utilized Positron Emission Tomography (PET) imaging in fifteen healthy male subjects.
Main Results:
- The intrinsic alertness network demonstrated stronger connectivity within the right hemisphere.
- Significant effective connections were found between the thalamus and brainstem, and between the thalamus and anterior cingulate cortex.
Conclusions:
- The anterior cingulate cortex acts as a central coordinator for the right hemispheric network underlying intrinsic alertness.
- Prefrontal and parietal cortex significantly modulate the anterior cingulate gyrus within this network.