The missing link: enhanced functional connectivity between amygdala and visceroceptive cortex in migraine.

Area of Science:

• Neuroscience
• Neuroimaging
• Pain Research

Background:

• Migraine is a neurovascular disorder potentially involving altered functional connectivity.
• Cortical spreading depression (CSD), linked to migraine aura (MWA), affects amygdala activity.
• The role of CSD and amygdala connectivity in migraine without aura (MwoA) remains less understood.

Purpose of the Study:

• To compare amygdala-to-cortex functional connectivity in MWA and MwoA patients.
• To investigate if migraine-specific connectivity patterns differentiate from other chronic pain conditions.
• To explore the neurolimbic basis of migraine pain.

Main Methods:

• Resting-state functional MRI was employed.
• Functional connectivity between the amygdala and cortex was assessed.
• MWA, MwoA, healthy controls, trigeminal neuralgia (TGN), and carpal tunnel syndrome (CTS) groups were studied.

Main Results:

• Both MWA and MwoA patients exhibited increased amygdala connectivity to the visceroceptive insula.
• This heightened connectivity was relative to all other examined groups.
• The findings suggest a distinct pattern in migraineurs compared to other chronic pain conditions.

Conclusions:

• Migraineurs display increased connectivity within the limbic/viscerosensory network.
• This supports the concept of a neurolimbic pain network dysfunction in migraine.
• Repetitive CSD episodes may contribute to the development of migraine pain via this network.