These gross features of the brain are almost certainly not sculpted by information coming in from the senses. That, in turn, implies that differences in intelligence, scientific genius, sexual orientation, and impulsive violence are not entirely learned.
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It means there is another explanation or another factor, beside the senses, that accounts for the things (intelligence, genius, orientation, and violence) cited. One way to look at it is that the brain alone explains some of these differences, but not all of them or the brain alone does not completely explain why these differences exist.
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There are more features that contribute to intelligence, scientific genius, sexual orientation, and impulsive violence than what is learned.
User
It admits that the cause mentioned is not the only cause.