Former Prime Minister Margaret Thatcher
famously had elocution lessons to lower her voice and make it sound more masculine and authoritative.
She was advised - correctly, in light of subsequent research - that members of the public would find this more appealing.
Studies have demonstrated that men and women prefer leaders of both sexes in politics or business to have lower voices.
The new research shows this rule even extends to leadership positions traditionally occupied by women.
Scientists in the US tested the effect with simulated elections for two feminine leadership roles, president of a parent-teachers organisation (PTO) and membership of a school board.