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Trajectory Interpretation by Supplementary Eye Field Neurons During Ocular Baseball

¹The Smith-Kettlewell Eye Research Institute, San Francisco, California; and ²School of Computer Engineering, Sejong University, Seoul, Korea

Submitted 31 January 2005; accepted in final form 19 April 2005

Good performance in the sport of baseball shows that humans can determine the trajectory of a moving object and act on it under the constraint of a rule. We report here on neuronal activity in the supplementary eye field (SEF) of monkeys performing an eye movement task inspired by baseball. In "ocular baseball," a pursuit eye movement to a target is executed or withheld based on the target’s trajectory. We found that a subset of neurons in the SEF interpreted the trajectory according to the task rule. Other neurons specified at a later time the command to pursue the target with the eyes. The results suggest that the SEF can interpret sensory signals about target motion in the context of a rule to guide voluntary eye movement initiation.

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