Figure 1.

Behavioral task and recording locations. A, Sequence of task events for correct trials, from top to bottom. Each dark gray rectangle represents the video monitor viewed by the monkey. The red arrows indicate the target of gaze. B, Cues and the response strategies each instructed. C, Coronal section based on MRI. Angle of penetration (black lines) allowed sampling of neuronal activity in both PFdl (green) and PFo (brown). Fix, Fixation period; LOS, lateral orbital sulcus; MOS, medial orbital sulcus; PS, principal sulcus.