I remember reading somewhere a while back about tests done on folks after they had undergone a commisurotomy(?), separating the brain halves.
If I remember correctly they were shown two different images, one to the left eye and one to the right. They were then asked to point to the object and say the name of it simultaneously. The subject was always surprised to find that the object pointed to was different from what they said.
I have no trouble saying the names of all the colors quickly. I wonder if being ambidextrious is a factor?