In other words, the SEF does not immediately or directly contribute to saccade initiation. But, the SEF is thought to improve saccade production by using prior knowledge of anticipated task requirements to influence saccadic eye movements. It does so by balancing gaze holding and gaze shifting actions, yielding a modest improvement in performance in stop signal tasks by delaying saccade initiation when necessary. It can be thought that the FEF does the driving part of saccade initiation, while the SEF acts as a backseat passenger, advising the driver as to what to do based on past insights. The SEF has recently been found to encode reward prediction error, suggesting that the SEF may actively evaluate decisions based on a value system on an occulomotor basis, independent of other brain regions.