Well, all the studies we've done indicate that, in order to be perceived as attractive and credible, we have to use, as you see in the graph, a low tone rather than a high-pitched tone.
Bueno, pues todos los estudios que hemos realizado indican que para ser percibido como atractivo y creíble tenemos que utilizar, como veis en el gráfico, un tono grave frente a un tono agudo.