Connectome-based lesion-symptom mapping (CLSM): A novel approach to map neurological function

Area of Science:

• Neuroscience
• Neurology
• Cognitive Science

Background:

• Lesion-symptom mapping is crucial for understanding brain structure-function relationships.
• Voxel-based lesion-symptom mapping (VLSM) advanced this field but has limitations in detecting white matter tract damage.
• VLSM's insensitivity to cortical disconnection can lead to underestimation of behavioral impairment causes.

Purpose of the Study:

• To introduce connectome-based lesion-symptom mapping (CLSM) as a complementary method to VLSM.
• To establish a statistical relationship between brain connectivity and behavioral performance in brain-injured patients.
• To identify key neural connections essential for specific behaviors, independent of predefined regions.

Main Methods:

• Developed whole-brain CLSM to analyze the strength of connections between all brain regions.
• Utilized a standard brain atlas for defining brain regions.
• Correlated connectivity data with behavioral performance in patients with brain injuries.

Main Results:

• CLSM identifies key connections critical for behavior, complementing VLSM's focus on gray matter lesions.
• The method demonstrates potential for detecting behavioral deficits arising from white matter tract damage.
• This approach offers a whole-brain perspective on how neural network integrity relates to function.

Conclusions:

• CLSM provides a powerful new tool for understanding brain-behavior relationships, particularly concerning network disruptions.
• This method has broad applicability across neurological and psychiatric diseases.
• CLSM warrants further exploration in both clinical and theoretical neuroscience research.