People are either left-brained (logical) or right-brained (creative)
Brain imaging research finds no evidence that individuals consistently rely more on one brain hemisphere overall or that personality traits like logic versus creativity map onto whole-hemisphere dominance, though some specific functions are genuinely lateralized to one side of the brain.
What we know
The left-brain/right-brain personality theory holds that some people are naturally more logical, analytical, and detail-oriented because they rely more on their brain's left hemisphere, while others are more creative, intuitive, and artistic because they rely more on their right hemisphere, a framework that has been used widely in pop psychology, career guidance materials, and educational marketing for decades. This theory draws loosely on real neuroscience findings from the 1960s and 1970s, particularly split-brain research conducted by Roger Sperry and Michael Gazzaniga studying patients whose corpus callosum, the band of nerve fibers connecting the two hemispheres, had been surgically severed to treat severe epilepsy, research that did find some functions are more concentrated in one hemisphere than the other, most notably language processing, which is typically more concentrated in the left hemisphere in the majority of people.
However, the specific personality-type claim, that whole individuals can be meaningfully categorized as globally left-brained or right-brained thinkers based on which hemisphere they predominantly use, has been directly tested using modern functional MRI research examining whether resting-state or task-based brain activity shows a consistent hemispheric dominance pattern correlating with personality traits. A widely cited study conducted by researchers at the University of Utah and published in 2013 analyzed resting brain scans from over 1,000 individuals specifically looking for evidence of a lateralized personality network, and found no evidence that people have a dominant hemisphere that governs a particular personality style, concluding that while specific functions are indeed lateralized, the idea that a person's overall personality or thinking style reflects greater reliance on one whole hemisphere over the other is not supported by the imaging data.
The genuine science of hemispheric lateralization is more specific and more limited than the popular framework suggests: certain functions, including most language production and comprehension in most people, and certain aspects of spatial processing and facial recognition, do show a measurable lean toward one hemisphere, a real phenomenon studied extensively in cognitive neuroscience. But these specific, narrow lateralized functions do not add up to the broad claim that entire cognitive styles, such as being a 'logical person' or a 'creative person,' are hemisphere-specific traits, since both creative and analytical thinking have been shown through neuroimaging to engage both hemispheres working together through extensive interconnections, rather than operating as two separable, competing cognitive systems each housed in one half of the brain.
Education researchers have specifically studied the consequences of the left-brain/right-brain framework being adopted in schools and teaching methods, sometimes used to justify tailoring instructional approaches to a student's supposed hemisphere dominance, and reviews of educational neuromyths, including work compiled by the OECD and by cognitive scientists studying neuromyths in education, list left-brain/right-brain personality typing among the most persistent and widespread myths held by teachers internationally, despite its lack of neuroscientific support, a finding of some concern given the resources sometimes devoted to hemisphere-based teaching interventions with no demonstrated benefit.
The theory's durability likely reflects its intuitive appeal as a simple, binary explanation for genuine and real variation in how people think and work, packaged in seemingly scientific language borrowed from real, but narrower, split-brain research, making it a case where an accurate specific finding was stretched into a much broader and unsupported general claim about personality and cognition.
Common claims
- Logical, analytical people rely mainly on their brain's left hemisphere.False, no imaging study has found personality traits map onto whole-hemisphere dominance.
- Creative, artistic people rely mainly on their brain's right hemisphere.False, creative thinking engages both hemispheres working together.
- Some specific brain functions, like language, are lateralized to one hemisphere.True, this narrower finding from split-brain research is well supported.
- Tailoring teaching methods to a student's dominant brain hemisphere improves learning.False, this is listed among common neuromyths with no demonstrated educational benefit.