Because brain expansion and technological progress were not well correlated in early hominins, it has been suggested that brain expansion may be attributable to

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Sexual selection is the process by which certain traits are selected for because they increase an individual's chances of mating. In the case of early hominins, it has been suggested that brain expansion may have been a sexually selected trait, as it may have made individuals more attractive to potential mates.

Because Brain Expansion and Technological Progress Were Not Well Correlated