Using Structural and Functional Brain Imaging to Investigate Responses to Acute Thermal Pain

Area of Science:

• Neuroscience
• Neuroimaging
• Pain Research

Background:

• Understanding the link between brain structure and function in pain processing is essential.
• The relationship between white matter microstructural coherence and functional brain responses to pain remains unclear.

Purpose of the Study:

• To investigate the association between fractional anisotropy (FA) in specific white matter regions and the functional magnetic resonance imaging (fMRI) blood oxygen level-dependent (BOLD) response to thermal pain.
• To explore how white matter integrity impacts the midcingulate cortex's (MCC) role in pain perception.

Main Methods:

• Functional MRI (fMRI) measured BOLD responses in 16 healthy males during painful thermal stimulation.
• Diffusion-weighted imaging (DWI) was used to calculate FA in the posterior internal capsule and cingulum.
• FA values were analyzed as covariates with fMRI data.

Main Results:

• BOLD response in the MCC showed a positive correlation with FA in the posterior internal capsule.
• BOLD response in the MCC exhibited a negative correlation with FA in the cingulum.
• These findings suggest white matter coherence modulates MCC activation during pain.

Conclusions:

• The MCC's functional response to pain is influenced by white matter microstructural coherence.
• These results provide a foundation for studying pain disorders with altered white matter integrity.
• Relating white matter coherence to functional activation aids in interpreting MCC BOLD signals in pain processing.