Functional Connectivity Linked to Cognitive Recovery After Minor Stroke

Area of Science:

• Neuroscience
• Cognitive Neurology
• Biomedical Engineering

Background:

• Minor stroke leads to cognitive deficits, particularly slowed processing speed.
• Functional connectivity alterations in the frontoparietal cortex (FPC) are observed post-stroke.
• The evolution of these connectivity patterns over time is not fully understood.

Purpose of the Study:

• To investigate the relationship between functional connectivity patterns and cognitive performance in minor stroke patients.
• To identify the neurophysiological underpinnings of cognitive improvement after minor stroke.
• To explore the potential of connectivity profiles for evaluating and predicting long-term cognitive outcomes.

Main Methods:

• Resting-state magnetoencephalography (MEG) was used to assess functional connectivity.
• Network Localized Granger Causality framework was applied to estimate connectivity.
• Neuropsychological tests evaluated cognitive performance across multiple domains.
• Longitudinal data collection occurred at 1-month and 3-6-month follow-ups.

Main Results:

• Significant increases in contralesional frontoparietal beta-band connectivity correlated with improved behavioral performance.
• Early reliance on the contralesional hemisphere was associated with better acute cognitive scores.
• Continued reliance on the ipsilesional hemisphere correlated with poorer later cognitive performance.

Conclusions:

• Specific functional connectivity profiles are associated with better acute and long-term cognitive performance after minor stroke.
• These profiles may indicate a greater potential for cognitive recovery.
• Further research is needed to determine if these connectivity patterns are modifiable.