>Miller’s study uses a test called the “trait-judgment task”: A trait like happy or sad flashes on a screen, and research subjects indicate whether the trait describes them. Miller has slightly modified this task for his split-brain patients—in his experiments, he flashes the trait on a screen straight in front of the subject’s gaze, so that both the left and right hemispheres process the information. Then, he quickly flashes the words “me” and “not me” to one side of the subject’s gaze—so that they’re processed only by one hemisphere—and the subject is instructed to point at the trait on the screen when Miller flashes the appropriate descriptor.

Seems to me (not a neuroscientist) like there's a flaw in that experiment: how would the right hemisphere understand the meaning of the words, if language is only processed by the left? I also recall reading that the more "primitive" parts of our brains don't have a concept of negation.

But maybe they have been considering this and it's no issue?