p462fig12.59 The TELOS model clarifies how reactive vs. planned eye movements may be properly balanced against one another, notably how a fast reactive movement is prevented from occuring in response to onset of a cue that requires a different, and more contextually appropriate, response, even if the latter response takes longer to be chosen and performed.  The circuit explains how "the brain knows it before it knows" what this latter response should be by changing the balance of excitation to inhibition in the basal ganglie (BG) to keep the reactive gate stays shut until the correct target position can be chosen by a frontal-parietal resonance.<BR>||  Balancing reactive vs. planned movements (Brown, Bulloch, Grossberg 2004).  (a) shows [FEF, PPC]-> [BG, SC], and BG-> SC.  (b) FTE vs time (msec) for [fixation, saccade, overlap, gap, delayed saccade] tasks.