Upstream dysfunction of somatomotor functional connectivity after corticospinal damage in stroke

Area of Science:

• Neuroscience
• Systems Neuroscience
• Motor Control

Background:

• Focal brain injuries can cause remote network dysfunction impacting behavior.
• Network-wide repercussions of focal injuries remain poorly understood.
• The somatomotor system's response to focal injury is a key area of study.

Purpose of the Study:

• To test if lesions in a network's outflow tract cause upstream dysfunction.
• To investigate if corticospinal tract lesions lead to somatomotor network disruption.
• To determine if motor impairment results from corticospinal damage and altered network connectivity.

Main Methods:

• Studied 23 subacute stroke patients and 13 healthy controls.
• Quantified corticospinal tract damage using diffusion tensor imaging.
• Assessed somatomotor network functional integrity via resting-state functional connectivity MRI.

Main Results:

• Corticospinal damage correlated negatively with interhemispheric resting functional connectivity.
• Connectivity between the left and right central sulcus was particularly affected.
• Altered connectivity impacted motor performance more in mild/moderate corticospinal damage cases.

Conclusions:

• Cortical functional connectivity dysfunction can follow corticospinal tract injury.
• This dysfunction contributes to impaired motor performance.
• Understanding these secondary effects is crucial for brain-behavior relationships and neurorehabilitation.