Here’s a fascinating video featuring split-brain researcher Michael Gazzaniga. The patient had his corpus callosum severed as a treatment for severe epilepsy. The treatment terminated nearly all communication between his brain’s right and left hemispheres.
Since language is primarily processed in the left hemisphere, the patient can’t name items on the left side of his field of vision (remember, the brain is “flipped” relative to the body parts it senses and controls). But he can draw pictures of them, and then he can look at the pictures and name them. (via Issues in the Philosophy of Cognitive Science and Mind)