Left brain, right brain?
It’s absolutely true that some brain functions occur in one or the other side of the brain. Language tends to be on the left, attention more on the right. But people don’t tend to have a stronger left- or right-sided brain network. It seems to be determined more connection by connection.
From a paper published on Plos: “An evaluation of the left-brain vs. right-brain hypothesis with resting state functional connectivity magnetic resonance imaging.”