I readily admit that my language processing center is not up to the task. Others are bringing up examples of people who seem to be.
However, the point is that we tie our thoughts to their verbalization, but the question is if verbalization equals thoughts? Others are bringing up memory here as well.
If we are capable of having parallel thoughts, just like the brain is able to run multiple parallel systems, could we also train to do parallel verbalization? Would we even need to?