A gender bias in the acoustic-melodic features of charismatic speech?

Previous studies proved the immense importance of nonverbal
skills when it comes to being persuasive and coming across as
charismatic. It was also found that men sound more
convincing and persuasive (i.e. altogether more charismatic)
than women under otherwise comparable conditions. This
gender bias is investigated in the present study by analyzing
and comparing acoustic-melodic charisma features of male
and female business executives. In line with the gender bias in
perception, our results show that female CEOs who are judged
to be similarly charismatic as their male counterpart(s)
produce more and stronger acoustic charisma cues. This
suggests that there is a gender bias which is compensated for
by making a greater effort on the part of the female speakers.