How does the size of a brain affect the level of intelligence?
In: Biology
There appears to be a slight link [between brain size and intelligence](https://www.scientificamerican.com/article/does-brain-size-matter1/). There’s a correlation of around 0.3 to 0.4. What this really means is about 10-15% of the variation in brain size is linked with intelligence. It’s not a very strong link, but it seems to be there.
But, it’s not clear which causes which. Do people with bigger brains find it easier to learn? Or does studying hard help your brain to grow bigger? We don’t know!
What that does mean is the most (85-90%) of the variation in brain size has nothing to do with intelligence.
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