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If human brains could be made larger, how much smarter could we be?

Our readers point to a weak correlation between brain size and IQ, but also highlight the many pitfalls that would come with increasing the size of our brains

6 November 2024

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If human brains could be made larger, how much smarter could we become? And is there a practical limit to brain size?

Marc Evans
Via email

Making the human brain bigger might sound like a straightforward way to boost intelligence, but it’s more complicated than that.

Intelligence isn’t just about size – it is also about things like how densely packed our neurons are and how well they are connected, as well as the brain’s structure and how efficiently it operates. There are also practical limits to increasing brain size.

Bigger brains require more energy, can cause complications during childbirth,…

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