Biased visuospatial perception in complex regional pain syndrome.

Area of Science:

• Neuroscience
• Pain Research
• Cognitive Psychology

Background:

• Complex regional pain syndrome (CRPS) is a chronic pain condition with sensory, motor, and autonomic symptoms.
• Cognitive difficulties, particularly concerning body representation, are reported in CRPS, but their extent is debated.
• Previous research suggested cognitive deficits are limited to body perception, not external space.

Purpose of the Study:

• To investigate visuospatial cognitive deficits in patients with upper-limb Complex regional pain syndrome (CRPS).
• To determine if CRPS affects the perception of external space, challenging previous findings.
• To explore the role of cognitive biases in CRPS pathophysiology.

Main Methods:

• Utilized temporal order judgment (TOJ) tasks with tactile (body) and visual (external space) stimuli.
• Assessed patients with upper-limb CRPS and compared their performance to control groups.
• Analyzed cognitive biases in judging the order of stimuli presented in different spatial locations.

Main Results:

• Tactile TOJ tasks showed no significant cognitive biases in CRPS patients.
• Significant cognitive biases were observed in visual TOJ tasks, particularly for stimuli near the affected limb.
• These findings indicate visuospatial deficits extending beyond body perception in CRPS.

Conclusions:

• CRPS is associated with visuospatial cognitive deficits affecting external space perception.
• The results support a cortical contribution to CRPS pathophysiology.
• Rehabilitation strategies targeting visuospatial abilities may be beneficial for treating chronic pain in CRPS.