Cognition and arithmetic skills among Munduruku

Pierre Pica, as a linguist specializing in comparative syntax, has been working for many years on Munduruku, the indigenous language spoken in the State of Pará in Brazil, and is studying phrases related to numeracy in this language.
He made observations on different counting methods:
In Sai Cinza in 2001, finger and toe counting and seed counting by an old man and the paje;
In Aldeia Jardini / Kaburua in 2002, the village chief David Karo; in Missao Cururu in 2003, an approximate comparison test (paper version) with a bilingual subject;
In Missao Velha in 2003, an approximate comparison test (paper version) with a monolingual subject - name test (paper version) with a monolingual subject - a Whalen test explained by the village cacique, Venancio Poxo - an approximate comparison test (computer version) and a name test (paper version) with a monolingual subject.