The climbing fibers (CFs) that project from the dorsal cap of the inferior olive (IO) to the flocculus of the cerebellar cortex have been reported to be purely sensory, encoding "retinal slip". However, a clear oculomotor projection from the Nucleus Prepositus Hypoglossi (NPH) to the IO has been demonstrated (De Zeeuw et al. 1993). We therefore investigated the sensorimotor information that is present in the CF-signal. We presented rabbits with visual motion noise stimuli, in order to break up the tight relation between instantaneous retinal slip and eye movement. Strikingly, the information about the motor behaviour in the CF-signal more than doubled that of the sensory component, and was time-locked more tightly. The contribution of oculomotor signals was independently confirmed by analysis of spontaneous eye movements in the absence of visual input. We hypothesize that the motor component of the CF code is essential to distinguish unexpected slip from self-generated slip, which is a prerequisite for proper oculomotor learning.