"We just don't see patterns where the whole left-brain network is more connected or the whole right-brain network is more connected in some people. It may be that personality types have nothing to do with one hemisphere being more active, stronger, or more connected..."
Certainly, some people are more creative, some people are more analytical, but this doesn't reflect in brain dominance. Nielsen encourages people to be more specific with their descriptions rather than just spouting sides to talk about people:
"Everyone should understand the personality types associated with the terminology 'left-brained' and 'right-brained' and how they relate to him or her personally."

-- Nandakumar