This book investigates the linguistic outcomes of contact between Arawak and Tucanoan languages within the Vaupés river basin of northwest Amazonia. Alexandra Aikhenvald, a prominent linguist specializing in Amazonian languages, utilizes extensive fieldwork and comparative analysis to examine how cultural ideologies regarding identity influence linguistic borrowing. The study provides a framework for understanding why certain grammatical and lexical categories remain resistant to change while others are susceptible to external influence.

Experts recognize this work as a foundational text for understanding the complex linguistic landscape of the Amazon basin. Scholars frequently cite the book for its rigorous methodology and its insightful exploration of the intersection between social ideology and language structure.