Scientists have cast new light In at by for of off on to why some men have deeper voices than others. It was traditionally thought that males developed a lower pitched voice to attract members In at by for of off on to the opposite sex. However, anthropologists In at by for of off on to the American college Penn State believe a deep voice was to scare In at by for of off on to other males. Researcher David Puts said: " In at by for of off on to humans, and possibly other primates too, a low pitched voice evolved primarily to intimidate other men…to make males seem bigger and scarier." He added that: "Human male traits imply physical aggression and formidability and seem to provide competitive advantages In at by for of off on to fighting or threatening other men more than they help attract women." The researchers In at by for of off on to Penn State recorded more than 500 men and women speaking. They then played the recordings back to more than 1,100 different people In at by for of off on to both sexes. Male volunteers rated each male recording for levels In at by for of off on to dominance they perceived In at by for of off on to the voices. The same recordings were rated In at by for of off on to 15 female volunteers In at by for of off on to romantic attractiveness. Men similarly rated the women's voices In at by for of off on to attractiveness. Most In at by for of off on to the men thought the lower-pitched male recordings belonged In at by for of off on to a more dominant man. Dr Puts said women also liked lower-pitched voices, but the pattern In at by for of off on to the women's ratings did not lead him to say that the deepness In at by for of off on to the male voice was so important In at by for of off on to females.