QS Study

Dysdiadochokinesis is the clinical term for an inability to perform rapidly alternating movements. In cerebellar lesion, when the motor control system fails to predict the different parts of the body will be at a given time. It losses the parts during rapid motor movement. As a result, the succeeding movement may begin too early or too late so the orderly progression of movement can occur. It is an inability to perform rapidly alternating movements, such as rhythmically tapping the fingers on the knee.


  • Patent with Dysdiadochokinesia experiences change in his/her equilibrium and walking.
  • Patient has poor coordination of the arms, hands and/or legs.
  • Dysarthria is present which dull or incomprehensible speech is.
  • The patient finds it difficult to stop one movement and start another movement instantly in the opposite direction.

An attempt to produce rapid alternate upward and downward movement of hand produce certain jumbled movement. The cause is a cerebellar lesion and is related to dysmetria, which also involves the inappropriate timing of muscle activity. The diagnosis of this situation is made after the patient is told to perform a sequence of easy movements, such as screwing on a light bulb, turning a doorknob, or rubbing the shin using the opposite heel.

So, dysdiadocho kinesia is inability to performs rapid sequential alternate movement.

Example: Inability to rapid supination and pronation of hand. Another example is observed in the inappropriate use of the tongue during mastication when it is necessary to change, reverse, and modify the energy and direction of movement.