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Scientists have cast new [lighting / light] on why some men have deeper voices than others. It was [traditionally / traditional] thought that males developed a lower pitched voice to [attraction / attract] members of the opposite sex. However, anthropologists at the American college Penn State believe a deep voice was to scare [on / off] other males. Researcher David Puts said: "In humans, and possibly other [primates / primitives] too, a low pitched voice evolved [primary / primarily] to [intimidate / intimate] other men…to make [male / males] seem bigger and scarier." He added that: "Human male traits [imply / comply] physical aggression and formidability and seem to provide competitive advantages [in / on] fighting or threatening other men more than they help attract women."

The researchers at Penn State recorded more than 500 men and women [speaking / speech] . They then played the recordings back to more than 1,100 [different / difference] people of both [sexes / sex] . Male volunteers rated each male recording for levels [for / of] dominance they perceived in the voices. The same recordings were rated by 15 female volunteers [from / for] romantic attractiveness. Men [similar / similarly] rated the women's voices for attractiveness. Most of the men [thought / thoughts] the lower-pitched male recordings belonged [for / to] a more dominant man. Dr Puts said women also liked lower-pitched voices, but the [patterned / pattern] of the women's ratings did not lead him to say that the deepness of the male voice was [so / such] important to females.