The Editors: Ximena Lois has a Ph.D. in linguistics and is an associate researcher at the Institut Jean Nicod, Paris, France. Her current fields of research include theoretical and Mayan linguistics, ethnolinguistics and cognitive linguistics. Special interests cover lexicon-syntax mapping, the interface between syntax and semantics, and the linguistic expression of emotions, possession, and causality.Valentina Vapnarsky has a Ph.D. in anthropology and is a researcher at the Centre National de la Recherche Scientifique, France. Her current fields of research include Mayan linguistics, pragmatics, linguistic and cognitive anthropology. Special interests cover discourse grammar and verbal interaction, syntax, the expression and conception of time, causality, and agency.

«En cualquier caso, este libro se presta a una reflexión constante a lo largo de su lectura, lo que da muestra de su actualidad y riqueza. [...] El libro está bien escrito, adelanta una introducción perfecta y ha habido un cuidado extremo en su diseño, maquetación y corrección. » (Julio Calvo, UniverSOS - Revista de Lenguas Indígenas y Universos Culturales)

• Contents: Ximena Lois/Valentina Vapnarsky: Introduction – Bruna Franchetto: Are Kuikuro Roots Lexical Categories? – Ximena Lois/Valentina Vapnarsky: Root Indeterminacy and Polyvalence in Yukatekan Mayan Languages – Marcia Haag: Thematic Structure and Lexemes: A Comparison of Choctaw and Cherokee Word Formation – Eliane Camargo: Lexical Categories and Word Formation Processes in Wayana – Marisa Malvestitti: Polyvalence in Mapuzungun: Contributions from a Patagonian Variety of the Language – Aurore Monod Becquelin: Categories and Compounding in Tzeltal: A Preliminary Approach – Francesc Queixalós: The Primacy and Fate of Predicativity in Tupi-Guarani – Johannes Helmbrecht: Are there Adjectives in Hocąk (Winnebago)? – Barbara Pfeiler: Polyvalence in the Acquisition of Early Lexicon in Yucatec Maya – Richard Carter: Polycategoriality and Predictability: Problems and Prospects.