Mental motor imagery indexes pain: the hand laterality task

Area of Science:

• Neuroscience
• Psychology
• Pain Research

Background:

• Motor imagery shares neural pathways with action execution.
• Anticipated sensory consequences, including pain, inform movement.
• Motor imagery may quantify functional interference from pain.

Purpose of the Study:

• To investigate if motor imagery, specifically the hand laterality task, can measure pain-related functional interference in chronic arm/shoulder pain patients.
• To assess the relationship between motor imagery performance and pain severity.

Main Methods:

• 19 patients with chronic arm/shoulder pain, 24 with other chronic pain, and 41 controls performed a hand laterality task (mental rotation).
• Response times were analyzed based on stimulus rotation amplitude.
• Correlation between task performance and pain ratings (movement-related vs. non-specific) was examined.

Main Results:

• Arm/shoulder pain patients were significantly slower on the hand laterality task for larger rotation amplitudes compared to controls.
• A correlation was found between increased task slowing and the severity of pain with movement in the arm/shoulder group.
• No correlation was observed between task performance and non-specific pain ratings.

Conclusions:

• The hand laterality task, a measure of motor imagery, is sensitive to functional interference in chronic arm/shoulder pain.
• This task may serve as a valuable supplementary tool for assessing pain severity and its impact on motor function in affected individuals.