Signals used to compute errors in monkey vestibuloocular reflex: possible role of flocculus

摘要: Adaptive changes were induced in the vestibuloocular reflex (VOR) of monkeys by oscillating them while they viewed visual scene through optical devices ("spectacles") that required amplitude eye movement during head turns. The "gain" VOR (eye velocity divided velocity) sinusoidal oscillation darkness underwent gradual appropriate to reduce motion images on retina adapting procedures. Bilateral ablation flocculus and ventral paraflocculus caused a complete enduring loss ability undergo adaptive VOR. Partial lesions substantial but incomplete capability. We conclude is necessary for monkey's Further experiments normal animals determined types stimuli and/or sufficient cause gain. Full-field stimulation was not induce Monkeys tracked small spot conditions elicited same combination movements seen passive with spectacles. gain showed 50-70% as large those produced duration Since effective tracking consistent correlation floccular output vestibular inputs, these data are compatible our previous suggestion may provide signals used central nervous system compute errors Prolonged optokinetic stationary only slight increase Left-right reversal vision decreases In rabbits, both stimulus increases VOR, which implied instead inputs Our different results argue computing monkey. species difference reflect additional role smooth pursuit play stabilizing gaze turns monkeys.