What does the best study actually show?
The strongest evidence comes from a 2022 review in *Theory Into Practice*, which identifies the left-brain/right-brain learning style as the second most pervasive neuromyth in education [1]. The authors state bluntly that individual characteristics and learning potentials cannot be categorized into left or right brain. They explain that while each hemisphere shows dominance in processing certain cognitive functions, the entire brain is required for any type of learning. The practical takeaway: good teaching doesn't match instruction to a supposed 'left' or 'right' learner—it engages the whole brain through multiple modes of instruction, practice, and self-regulation.
If brain asymmetry is real, why isn't the personality theory true?
It's true that the two hemispheres have some specialized roles—language and logic are more left-dominant, while spatial awareness and intuition are more right-dominant. But this doesn't mean people are 'left-brained' or 'right-brained' as personalities. A 2014 review in *PLoS Biology* explains that brain asymmetry is inborn, under partial genetic control, and widespread among animals—not unique to humans [4]. The author notes that cognitive difficulties are sometimes associated with departures from the typical pattern of right-handedness and left-brain language dominance, but these are about the *absence* of asymmetry, not its reversal into a personality type. In other words, the brain's asymmetry is about functional specialization, not a personality dichotomy.
Why does the myth stick around, and what should you believe instead?
The myth persists partly because it offers a simple, appealing story about personality. But the evidence shows that learning and thinking are whole-brain processes. The 2022 review emphasizes that there are considerable individual differences in hemispheric specialization for any given function, meaning no two people's brains are wired exactly the same [1]. Instead of labeling yourself as left- or right-brained, the research suggests you can develop skills across domains by engaging in diverse learning activities, practicing important skills extensively, and taking control of your own learning. Even a 2022 study testing deep learning AI on 'left-brain right-brain' tests found that the AI's responses varied, reflecting the test's lack of clear biological basis [2]. The bottom line: your personality isn't determined by which hemisphere you use more—your whole brain works together for everything you do.
Sources used in this answer
Beyond left and right: Learning is a whole-brain process
The left-brain/right-brain learning style is the second most pervasive neuromyth in education; the entire brain is required for any type of learning, and individual differences in hemispheric specialization are large [1].
Do Deep Learning Models Mimic Human Personality Traits? – An Empirical Study
Deep learning image classifiers tested on left-brain/right-brain tests showed variable responses, indicating the test lacks a clear biological basis [2].
The dual-brain myth
The dual-brain myth has been used to attribute personality and cultural traits to hemispheres, but this is not supported by neuroscience [3].
Left brain, right brain: facts and fantasies.
Brain asymmetry is inborn, under partial genetic control, and widespread among animals; cognitive difficulties are more often linked to absence of typical asymmetry than to its reversal [4].
S2E031: Left Brain / Right Brain
This source is a podcast transcript with no scientific evidence; it does not contribute to answering the question [5].