Hi Sophie, maybe this link could help you: "Spectral analysis for the ear," M.J. Goupell and W.M. Hartmann, Proceedings of the 18th International Congress on Acoustics in Kyoto, 2004, paper We2E2. it's not so recent though. Best wishes, Julian Villegas Me pregunto de un modo pensativo Que significa ser Colombiano? No se le respondi. Es un acto de fe JLB.