Are right-brained people really more creative? Here’s what the science really tells us

The notion that people are either "left-brained" or "right-brained" – implying that their personalities and skills are dominated by one side of the brain – has persisted for generations. However, this idea is more myth than science. The origins of this belief can be traced back to the 1860s when French doctor Paul Broca discovered that speech control was primarily managed by the left side of the brain.

A century later, Nobel laureate Roger Sperry confirmed that different brain hemispheres control distinct functions. For instance, he observed that epilepsy patients who underwent brain surgery, which involved severing the nerve fibers connecting the two brain halves, exhibited distinct capabilities in each side. This led to the idea of lateralized behavior, where different tasks are assigned to one side of the brain or the other.

This concept is not exclusive to humans; it is also observed in various animals, including insects and birds. The evolutionary perspective suggests that having specialized functions on each side of the brain may have been advantageous for survival, enabling various tasks to be carried out simultaneously, such as avoiding predators while searching for food.

However, the general public has taken this scientific finding and applied it too broadly, assuming that individuals are fundamentally "left-brained" or "right-brained" simply because certain brain regions are more active in specific functions. This oversimplification stems from interpreting the observed lateralization as proof that entire personality traits and skills are determined by one side of the brain.

To test this hypothesis, researchers conducted a study in 2013, analyzing MRI scans of over 1,000 individuals to map over 7,000 brain regions. They aimed to determine if consistent patterns of brain activity could reveal whether specific traits are controlled by one hemisphere. The findings showed that certain functions are indeed localized to particular brain regions, mainly those relating to language and attention.

However, there was no evidence suggesting that these networks differ between individuals based on their personality traits or abilities. Consequently, the researchers concluded that the left-brain/right-brain dichotomy did not align with the broader personality or skill variations observed in people. Another angle explored was the relationship between right-brain activity and creativity.

Some studies suggested that right-brain dominance might be associated with creative thinking. However, these studies did not provide substantial evidence that right-brain activity alone drives creativity. Instead, creativity is believed to involve a widespread network of brain activity spanning both hemispheres, rather than relying on the right hemisphere exclusively.

While individual differences in brain lateralization do exist and can influence performance in specific tasks, they do not dictate a person's overall personality or thinking style. This myth's enduring popularity can be attributed to the Barnum effect, where people tend to believe that generic personality descriptions apply uniquely to them.

This phenomenon reinforces the belief in personalized brain dominance, leading individuals to notice and reinforce traits that confirm their self-image while disregarding contradictory evidence. Ultimately, both hemispheres of the brain contribute to various cognitive functions, including logic and creativity, debunking the notion that one side of the brain controls the other.