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The brain, with its self-similar structure, most likely implements a kind of universal information processing substrate -- for example, if you redirect visual input to the auditory cortex in mice, they learn to see with their auditory cortex.
This universality should imply that the more of that substrate you have available, the smarter you will be, right? Well, not quite.
Remarkably, significant cortical lesions happening early in the developmental process often don't result in cognitive impairment, suggesting that the *quantity* of processing substrate that you have available is not the bottleneck to your intelligence (if you have enough of it).
If you were to be born with a neocortex twice larger than normal (a very big head), would you be super-smart? Most likely, you'd learn to use that extra brain tissue, yet you would not see significant cognitive benefits. The bottleneck to scaling intelligence isn't your brain.
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