Somatic Symptom Disorder (SSD) and Functional Neurological Disorder (FND / Conversion Disorder) involve distressing physical and neurological symptoms that cannot be explained by structural organic disease or typical pathology. In FND, patients experience genuine neurological deficits—such as non-epileptic seizures, functional weakness, gait disturbances, or blindness—characterized by internal inconsistency (e.g., Hoover’s sign for functional leg paresis, where hip extension weakness resolves automatically during contralateral hip flexion). Grounded in Mark Edwards and Karl Friston’s Predictive Processing Model of Brain Function, FND is not “imagined” or “faked”; it is a software problem in the brain rather than a hardware structural defect. The Somatic Symptom Disorder and Functional Neurological Symptoms Psychoeducation Module delivers 21 structured video lessons on predictive priors, sensory attenuation, and specialized motor retraining.
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Predictive Processing: Top-Down Sensorimotor Mismatch
Modern neuroscience reveals that the brain is not a passive sensory camera; it is an active prediction machine that generates top-down models of what it expects to feel or execute. In FND, abnormal “priors” (expectations of paralysis, tremor, or seizure) override bottom-up sensory feedback, reinforced by aberrant attentional focus. When the individual consciously attempts to move, attention actively disrupts automatic motor loops.
The “Hardware vs. Software” Clinical Explanation
Explaining the diagnosis with dignity is therapeutic in itself:
- The brain’s hardware (structural MRI, CT scans, nerve conduction) is intact and undamaged.
- The brain’s software (the neurological signaling and access to movement programs) is experiencing a functional glitch.
- Specialized multidisciplinary physiotherapy uses distraction techniques (walking backwards, dual-tasking) to bypass conscious interference, re-engaging automatic subcortical motor pathways.
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