Neuronal correlates for ocular pursuit : representation of target velocity and eye- and head-movement signals.

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To elucidate the roles of frontal (FEF, SEF) and cerebellar oculomotor-related areas (dorsal vermis-caudal fastigial nuclei, floccular region) in programming ocular tracking of moving objects, we examined signals represented in these areas and the effects of chemical inactivation in trained monkeys. Our results indicate different roles of FEF and SEF and the two cerebellar oculomotor-related pathways. In particular, during memory-based smooth pursuit, different cerebral and cerebellar pursuit-related areas played distinctly different roles in assessing visual motion-direction, remembering it, and deciding whether or not to pursue. Our results also suggest involvement of the cerebellar dorsal vermis-caudal fastigial pathway in the memory of not-to-pursue moving objects.