tag:techtv.mit.edu,:Array/218985940 2009-05-28 10:44:31 -0400 MIT News Office Neurons in the visual cortex (area V4) encode the visual scene, and neurons in the FEF portion of prefrontal cortex control the focus of attention. When attention (cone and circle) is directed to the red book, neurons in FEF and V4 (represented by red triangles) start firing rhythmically, and the neural activity becomes synchronized across the two areas. 3