Most things in psychology make more sense in the light of evolution. Consider,
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This paper presents evidence that female choice could have contributed to the rapid evolution of human language. Sexual selection has driven rapid evolution of sometimes extravagant traits, including the peacocks tail. It argues for a contribution of sexual selection, specifically female choice, to the rapid evolution of human language. Language may influence mating in two ways: As Pinker (1994) suggests, it can be a tool of seduction; more importantly, we think, it can be involved in sexual selection.
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