type of rigidity in which, when a patient's limb is moved by the examiner, it resists and gives way in small, step-like movements as if it was being controlled by a cog-wheel.
A type of muscle tone characterized by generally increased tone which on movement will intermittently relax a tiny bit, giving the sense of a cogwheel to the examiner. It occurs in extra-pyramidal diseases such as Parkinson's Disease.