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Do you have an article link for that statement by any chance?
you can trust me, i readed once about ancient human species, found on an island, this specie were small, cause they adapted on the small resources on the island since they didnt leave it, also they had small brains, and they had actually kinda complicated objects, esspecially for there time, it's not complicated for our days, but, they had actually tools, also other small tools, with many details, and hard to make, anywa, i don't remeber well the rest, but they had small brains wich it allows them to make more complex objects, also, my brother, also my sister, once studied about it in science, people who have smaller brains, usually there brains will have more, like, those lines, (sorry, don't know what they called, but you understood what i mean) anywya, the more the brain goes smaller, the more those lines appear more, and people with smaller minds, have a better intilligence, inless they had small brains because of a deseise, sorry for not being exact,