Myth of right-brain and left-brain personality traits debunked

The orange shaded areas show parts of the brain in the left and right hemisphere responsible for moving this patient's hand. Motor function is organized such that the left side of the brain controls muscles in the right side of the body and vice versa.
Image credit: University of Utah
Date:9 October 2013 Tags:, , , ,

Newly released research findings from University of Utah neuroscientists assert that there is no evidence within brain imaging that indicates some people are right-brained or left-brained.

For years in popular culture, the terms left-brained and right-brained have come to refer to personality types, with an assumption that some people use the right side of their brain more, while some use the left side more.

Following a two-year study, University of Utah researchers have debunked that myth through identifying specific networks in the left and right brain that process lateralised functions.

Lateralisation of brain function means that there are certain mental processes that are mainly specialised to one of the brain’s left or right hemispheres. During the course of the study, researchers analysed resting brain scans of 1 011 people between the ages of seven and 29. In each person, they studied functional lateralisation of the brain measured for thousands of brain regions —finding no relationship that individuals preferentially use their left-brain network or right-brain network more often.

“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,” said Jeff Anderson, M.D., Ph.D., lead author of the study.

Source: University of Utah

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