(A) Anatomical images showing the general location of FEF in humans. Note that human FEF appears to be more caudal compared to gorilla, macaque or owl monkey. (B) Sketch of a gorilla’s brain, annotated during surgery, to show areas that evoke motor responses in face, trunk, and eyes (Leyton and Sherrington, 1917). (C) Sketch of a macaque’s brain, annotated during surgery, to show areas that evoke eye movements. (D) Sketch of an owl monkey’s brain, annotated to show extrastriate areas that are connected to FEF.