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A recent series of studies points to an important constraint on the functional domain of cerebellar timing. Patients with cerebellar nature, lack an event structure; for these movements timing may associated with movements produced by other effectors (Grodd et al., 2001). For discrete movements, participants were instructed to pause before each flexion cycle. For continuous movements,Patients with cerebellar damage exhibit increased temporal variability in the production of timed movements (Ivry and Keele, 1989; Spencer et al., 2003). A corresponding deficit is observed on duration discrimination tasks (Ivry and Keele, 1989; Mangels et al., 1998; Nichelli et al., 1996) suggesting a critical role for the cerebellum in the representation of temporal information. Imaging studies of production (Kawashima et al., 2000; Lutz et al., 2000) and perception (Jueptner et al., 1995; Lewis and Miall, 2003a; Smith et al., 2003) tasks have provided converging evidence for this hypothesis