Fig. 6.
Predicting and compensating for consequences of motor commands depends on the cerebellum. Subject holds a ball with their left hand and releases it into a basket held by the right hand. Healthy individuals increase their grip force in anticipation of the ball’s impact. Patient HK, who suffered from cerebellar agenesis, has a grip force that rises in response to the impact but not before it. The bottom trace refers to the acceleration of the right hand (holding the basket). The impact of the ball is marked by the first vertical line. (from Nowak et al. 2007)