We played those similar-sounding word pairs to a group of listeners, and we told half of the listeners that they were going to listen to just your normal run-of-the-mill Spanish speaker and the other half of the listeners that they were going to hear a Quechua speaker.
Hicimos que un grupo de personas escuchara estos pares de palabras similares. A la mitad le dijimos que iban a escuchar a un hispanohablante común y corriente y a la otra mitad que iban a escuchar a un quechua.