Volume I: Collecting the work of linguists, psychologists, neuroscientists, artificial intelligence researchers and philosophers this volume presents a richly varied picture of the nature and function of mental states.

Volume II: The contributions to this volume focus on what language and language use reveals about cognitive structure and underlying cognitive categories. Wide-ranging and thought-provoking essays from linguists and psychologists within this volume investigate the insights conceptual categorization can give into the organization and structure of the mind and specific mental states.