You searched for: “adiadochokinesis
adiadochocinesia, adiadochocinesis; adiadochokinesia, adiadochokinesis (s) (noun)
1. Loss of the power to perform rapid alternating movements: "This symptom of adiadochocinesia is indicative of a disorder of the cerebellum or its tracts."

"Adiadochokinesis involves the inability to stop one movement and then to follow it immediately with another motion in the opposite direction."

2. The inability to perform rapid alternating movements of one or more of the body's extremities: "Adiadochocinesis is sometimes requested by physicians during physical examinations so they can determine if the patient has any neurological problems."