Interaction between signals from vestibular and forelimb receptors in Purkinje cells of the frog vestibulocerebellum.

Activity from vestibulocerebellar Purkinje cells was recorded during roll oscillation (control) and roll oscillation accompanied by passive forelimb movement (test). Control stimulus evoked mossy and climbing fiber responses. In some units, the test evoked a smaller climbing fiber response. This suggests an error-signaling role for the climbing fibers since a larger response was evoked in the absence of appropriate compensatory limb movement.