You're either left-brained or right-brained. Logical and analytical or creative and emotional. Pick one and your career, your hobbies, your love life follow. There were posters of this in your Year 9 careers room. There was a personality quiz in Cleo. Tony Buzan made a fortune off it. Daniel Pink made a different fortune off the right-brained reboot. Every TED talk needed a brain hemisphere slide. The data felt undeniable because we had stroke patients, brain scans, and 'I'm an artist' t-shirts to back it up.
Brains do have specialisation. The language centres lean left in most people. Spatial processing leans right. Stroke damage on one side produces different deficits to the other. All true. What isn't true is that your personality, learning style, or career fit is determined by which side runs the show. A 2013 University of Utah study scanned 1,011 people across two years of fMRI data and found no evidence that any individual is 'left-dominant' or 'right-dominant.' The hemispheres are connected by 200 million nerve fibres, called the corpus callosum, whose entire job is making sure they share notes constantly. Almost every cognitive task lights up both sides. The Cleo quiz was vibes-based. Tony Buzan's mind maps still work, just not because of which lobe is in charge. The brain runs as a single networked organ. We just liked the binary. It made the t-shirts easier.
Reception
Sources
- Nature: Brain Hemispheres PRIMARY
- Neuroscience News: Left-Right Brain REFERENCE