Sensory motor amnesia is Thomas Hanna's term for a muscle held contracted so long the brain has lost the sense of how to release it.
The person cannot find the off switch; stretching the muscle from the outside does not restore it. In 📝Somatic Practice pandiculation is the usual invitation back. The phrase is a working picture, not a medical diagnosis of amnesia, paralysis, or brain injury, and not a claim that a session rewires the motor cortex. If a region is truly numb, weak, or newly lost, that is a referral.
Clients feel a muscle they did not know was on. Forcing a release is the wrong version. Persistent unexplained loss of function belongs with licensed care.