A type of rigidity seen in parkinsonism in which the muscles respond with cogwheel-like jerks with the use of constant force when bending the limbs.

The term parkinsonism is any of a group of nervous disorders similar to Parkinson's disease, marked by muscular rigidity, tremor, and impaired motor control and often having a specific cause; such as, the use of certain drugs or frequent exposure to toxic chemicals.

It is also called Parkinson's syndrome or it may actually refer to having Parkinson's disease.