A split-brain patient is shown the word SPOON in the left visual field. He says he saw nothing, then reaches under the screen with his left hand and picks out a spoon. Why can he select the object but not say what it was?

C. Because the right hemisphere controls the left hand but has no speech.

Follow the wiring and the paradox dissolves: the left field goes to the right hemisphere, which moves the left hand and has no speech, and the callosum that would have carried it left is cut. When he says 'nothing' he is truthful, the speaking hemisphere genuinely saw nothing, and the one that knows cannot report.