Fig. 1.

Behavioral effects on neuronal responses in an exogenous cueing paradigm. (a) Left: relevant (red) and irrelevant (blue) optic flow trial types. In relevant optic flow trials, centered fixation is followed by optic flow with one of eight radial centers of motion and then an array requiring a saccade to the remembered radial center location. In irrelevant optic flow trials, a flashed square preceded the irrelevant optic flow and a saccade was required to the remembered square location. Right: precue effects were seen in the flow-irrelevant condition by comparing trials in which the precue was nearby (green) versus far from (light blue) the radial center location. (b) Left: neuronal responses (mean ± s.e.) to optic flow with Gaussian fits to flow-relevant (solid, red) and flow-irrelevant (dashed, blue) trials showing greatest flow-relevant enhancement at the preferred radial center. Right: neuronal responses to optic flow in near (solid, green) and far (dashed, light blue) precue trials showing greatest near precue enhancement at the preferred radial center. Gaussian fits are to the averaged, normalized responses aligned on the radial center of motion that evoked the largest response in each neuron.