You Are Not Left-Brained

Somewhere in your organisation there's a workshop slide with a brain on it. The left half is blue and full of numbers. The right half is a rainbow of paint splashes and music notes. Accountants on the left, creatives on the right. Which one are you?

Neither. The brain doesn't work like that.

There is something real underneath. In 1861, the French physician Paul Broca found that damage to a region of the left hemisphere could wreck a person's ability to speak. In 1874, Carl Wernicke found another left-side area involved in understanding language. For most right-handed people, language really is concentrated on the left.

Then came the split-brain studies. In the 1960s, surgeons treating severe epilepsy cut the corpus callosum, the thick bundle of fibres connecting the two hemispheres. Roger Sperry and Michael Gazzaniga studied those patients and found that the separated halves had different strengths. The left handled speech. The right was better at some spatial tasks. Sperry shared a Nobel Prize for it in 1981.

And that's where the trouble started. The careful science got turned into a personality test. The left brain became "logical" and the right became "creative". Then came whole-brain training, exercises to "activate" your neglected right hemisphere, and children sorted into left- and right-brained by quizzes with no validity at all.

In 2013, researchers at the University of Utah tested the idea directly. They analysed more than a thousand brain scans, looking for people who used one hemisphere more than the other across the board. They didn't find any. Particular functions lean to one side, but people don't. Nobody is left-brained or right-brained.

The split-brain patients are actually the proof. Their hemispheres behaved differently because surgery had cut the connection. In the rest of us, the two halves are massively connected and working together all the time. Creativity needs logic. Logic needs imagination. Writing a good sentence uses both.

So why does the myth hang on? Because it's a story about identity, and people love being told what type they are. "I'm a right-brain person" is an excuse dressed up as science. It explains why you're bad at spreadsheets, and it sounds better than "I don't like spreadsheets".

That's the bit worth watching in business. Labels shape behaviour. Tell someone they're "not a numbers person" and they'll stop trying with numbers. Tell a team they're "the creatives" and they'll leave the commercial thinking to someone else.

You have one brain, with two connected halves. Use all of it.