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Positive signs are essential for the diagnosis of functional neurological disorders (FND). The author described a new positive sign to diagnose functional weakness (FW), "paradoxical wrist flexion", and tested its validity. The test comprised Medical Research Council (MRC) examinations of wrist flexion in two different limb positions, one with the wrist maximally flexed (wrist flexion in the flexed position; WFfl) and the other with the wrist in the neutral position (wrist flexion in the extended position; WFex). In "organic" weakness (O