Book excerpt: This book is an exploration of interrelationships among culture, language, and the individual unconscious (the dark matter of the mind ), how these feed into a sense of self, and implications for the notion of human nature. The first part of the book is concerned with perceptual and cultural bases of dark matter and the effect of dark matter on perception (especially vision) and the interpretation of discourse. The second part is concerned with the contribution of dark matter to languagewith language viewed as a combination of speech and gesture, and including issues related to translation. In the final part Everett addresses implications of his account, summarizing and extending arguments for replacing an instinct-based account of human nature with a culturally-based, dark matter view of the constructed self. Everett makes a powerful argument for the influence of culture on unconscious forces that underlie human behavior and the individual s sense of self, with much of the power of the argument coming from the deep insights he gained from living and working with the Pirahas of the Amazon. This is an important book that sits at the intersection of anthropology, linguistics, psychology, and philosophy, and it is enriched by a combination of the author s knowledge of these fields and his cross-cultural perspective. The book will make an important contribution to newly emerging directions taken by cognitive science. After decades of a field derailed by ethnocentric, instinct-based views of language and the mind, the cognitive sciences need such informed analyses of the relationship between culture, cognition, and language, as embodied in speech and gesture."