Deciphering the impact of cerebellar and basal ganglia dysfunction in accuracy and variability of motor timing

► Accuracy and variability of motor timing was assessed using a finger-tapping task. ► Participants were healthy, had generalized cerebellar dysfunction or Parkinson Disease. ► Inaccuracy of motor timing during the short duration interval differentiated groups. ► Variability of motor timing was increased in the cerebellar disorder participants.