Behavioral Indicators of Pain Representation

The goal of this observational study is to compare the postural response to the mental simulation of everyday situations identified as painful in participants with non-specific low back pain and healthy volunteers. The main questions it aims to answer are : Do participants with low-back pain show reduced variability in center of pressure displacements compared with non-painful participants when faced with mental simulation of everyday situations identified as painful? Is the postural response correlated with the level of kinesiophobia? Participants will be faced to pictures of everyday situations identified as painful while several physiological measurements (posturography, electromyography, heart rate) are being recorded.