Cover picture: A flattened representation of the human cerebellar cortex [Van Essen DC (2002) Surface-based atlases of cerebellar cortex in the human, macaque, and mouse. Ann NY Acad Sci 978:468-479]. Reaching movement-related activity (top map) can be observed in the ipsilateral lobules V-VI and bilaterally in the inferior cerebellum (lobules VIIb-VIII). The bottom maps show widespread activity in the same regions attributable to both target errors (left, green) and execution errors (right, kinematic errors in blue and dynamic errors in red). An increase in the required force during the movement does not lead to activity in the cerebellar cortex (left, purple). See the article by Diedrichsen et al. for details (pages 9919–9931).