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A neuronal correlate of trajectory prediction in the supplementary eye fields.

A neuronal correlate of trajectory prediction in the supplementary eye fields. S. J. Heinen and Y.-G. Kim The Smith-Kettlewell Eye Research Institute San Francisco, CA. Motivation Problem:

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A neuronal correlate of trajectory prediction in the supplementary eye fields.

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  1. A neuronal correlate of trajectory prediction in the supplementary eye fields. S. J. Heinen and Y.-G. Kim The Smith-Kettlewell Eye Research Institute San Francisco, CA

  2. Motivation Problem: Smooth pursuit is modeled as a reflexive system - when an object moves, the eyes move. But voluntary behavior often requires suppressing a reflex and deciding on a more appropriate course of action. Question: Can the pursuit system override reflexive responses, and if so, what are the neural mechanisms controlling volitional pursuit when it does?

  3. Methods Eye movements were measured from two macaque monkeys, and single neurons were recorded from the supplementary eye fields (SEF), 44 of which are described here. The monkeys performed an ocular baseball task that was modified from the classic go-nogo paradigm. In ocular baseball, the player must discriminate a target’s trajectory and then follow a rule that dictates whether or not to pursue it. The rule is not inherent in the trajectory, rather it is specified explicitly by the context in which the trajectory appears.

  4. Baseball Arcade Game (circa 1927) Musee Mecanique, San Francisco

  5. strike zone

  6. Summary and Conclusions • Activity in the SEF during ocular baseball comprises three relevant classes: • -Movement execution • -Active movement inhibition • -Cuing • Cue neurons can categorize by activity level a motion trajectory in the framework of an explicitly specified rule (ball or strike). • The separation time for the cue cells precedes the motor-related neuron separation times, revealing the sequence of processing in the SEF. • The SEF apparently has a supervisory role in interpreting sensory evidence for execution and active suppression of movement.

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