Demonstrating respect to the addressee is accomplished by speaking in a high-pitched voice among the Zapotec speakers of Santa María Lachixío. Various factors determine the use of this feature.
Persons, Jan A.
"High pitch as a mark of respect in Lachixío Zapotec,"
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 41, Article 6.
Available at: https://commons.und.edu/sil-work-papers/vol41/iss1/6