It means that some brain processes are more strongly associated with one cerebral hemisphere than the other—a pattern called functional lateralization. It does not mean that one half handles an entire kind of thinking by itself, or that people are globally “left-brained” or “right-brained.” For most ordinary tasks, the hemispheres work together.
What hemispheric specialization means
The cerebrum has a left and a right hemisphere. Some functions and neural networks show a bias toward one side, but the strength and location of that bias vary by function and person. Specialization is therefore a matter of emphasis, not exclusive ownership.
For example, language is commonly more strongly represented on the left, while some visual and spatial attention functions are more strongly associated with the right. Those tendencies do not divide the mind into two independent systems. A 2014 review describes separate dimensions of asymmetry involving language, vision, internal thought and attention; they do not combine into one universal measure of which hemisphere is dominant. Read the review, “Left Brain, Right Brain: Facts and Fantasies.”
What the left and right hemispheres tend to do
Language
Speech production and many aspects of language processing are usually more left-lateralized. The right hemisphere still contributes to communication, so “language is on the left” is a shorthand for a common bias, not a claim that the other side is uninvolved.
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Language organization varies between individuals. A 2014 review reports that 95–99 percent of right-handed people and about 70 percent of left-handed people are left-lateralized for language. These are figures reported in that review, not a new population estimate; handedness alone cannot tell you how a particular person’s language functions are organized. The review discusses handedness and language lateralization.
Visual and spatial attention
Some aspects of visual and spatial attention are more strongly associated with the right hemisphere. This, too, describes a tendency in particular functions—not a general-purpose “creative” or “visual” half of the brain. NIMH’s archived 2013 science update names visual/spatial attention among right-biased examples and language among left-biased ones. NIMH notes that the page is historical and may not reflect current knowledge. Read the NIMH update.
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Movement and sensation
Many motor and sensory pathways have a broad crossed organization: the left cerebral hemisphere primarily controls or processes information from the body’s right side, and the right hemisphere much information from the left. Many motor tracts cross in the medulla, but not every pathway crosses, and each hemisphere is not entirely cut off from information about the same-side body. The National Academies’ chapter on brain structures and functions explains these pathways.
How the hemispheres communicate
The corpus callosum is a major bundle of white-matter fibers connecting the hemispheres and allowing information to pass between them. This communication helps explain why lateralized functions do not make the typical brain two separate minds.
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Split-brain research examined people whose hemispheres had been surgically disconnected to help control severe epilepsy. These cases let researchers study what happens when ordinary information transfer between the sides is interrupted. They demonstrate both specialization and the importance of communication; they do not show that people with an intact corpus callosum have two separate personalities. NCBI Bookshelf describes a key demonstration of language lateralization.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does “left-brained” or “right-brained” describe personality?
No. The neuroscience supports specific lateralized functions, not the popular personality division in which logical people are “left-brained” and creative people are “right-brained.” A 2014 review says brain imaging links creative thought to a widespread network that does not favor either hemisphere. The Society for Neuroscience’s BrainFacts likewise explains that neither hemisphere is truly dominant overall. Read BrainFacts’ 2024 explanation of the hemispheric myth.
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A 2013 NIMH update also reported a study associating stronger measured lateral specialization at rest with better performance on later verbal and spatial tasks. BrainFacts describes the study as involving more than 1,000 resting-state scans. This is a study-specific result, not evidence that one side dominates a person’s thinking or determines general intelligence; the NIMH page is archived. See the historical NIMH summary.
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What to take away
- Some functions show a stronger bias toward one hemisphere, but specialization is not exclusive control.
- Language is commonly left-lateralized; some visual and spatial attention functions are commonly right-lateralized.
- Language dominance varies, and handedness is not a reliable way to infer an individual’s brain organization.
- The corpus callosum links the hemispheres, and most everyday thinking draws on coordinated brain networks.
- “Left-brained” and “right-brained” are not scientifically supported personality types.
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