The August, 1967 article in Scientific American on the split brain has an interesting comment about communication between the two parts of the brain: if one sid

The August, 1967 article in Scientific American on the split brain has an interesting comment about communication between the two parts of the brain: if one side of the brain saw a drawing (by showing the picture to only one eye), the person might not be able to describe it because voice functions were handled on the other side of the brain, but if the drawing was somehow embarrassing the facial flushing (from seeing a sexy picture on one side of the brain) could be detected by the voice side and the subject would be able to vocalize that he or she was seeing a racy picture. Note that my recollection of this 1967 article on the split brain is a bit sketchy, I read this article in a library (in 1967) and it is unfortunately now available only for purchase on the Scientific American website.