Left brain vs. right brain theory In the 1960s, the neurobiologist Roger W. Sperry suggested that all people have one-half of their brain, which is more dominant and determines their personality, thoughts, and behavior. Due to the different functions of the two brain hemispheres, the idea that people can be left-brained and right-brained is tempting.

According to the dated theory, left-brained people are more: analytical logical detail- and fact-oriented numerical likely to think in words By contrast, the theory suggests that right-brained people are more: creative free-thinking able to see the big picture intuitive likely to visualize more than think in words