This volume is the second of a two-volume collection on mental states. The contributions to this volume focus on the question what language and language use reveals about cognitive structure and underlying cognitive categories, whereas the first volume is concerned with evolutionary and functional aspects of certain mental states in an effort to understand their nature. The contributions to this volume address the question what insights conceptual categorisation can give us into the organisation and structure of the mind and thus of mental states. Topics and linguistic phenomena investigated under this view include narratives and story telling, language development, figurative language, questions of linguistic categorisation, linguistic relativity, and more generally the linguistic coding of mental states (such as perceptions and attitudes). The volume comprises contributions from psychologists and linguists who explore the interaction between language and cognition. This reflects the provenance of the chapters, versions of which were presented at the 'International Language and Cognition Conference', held in September 2004 at Pacific Bay Resort in Coffs Harbour, Australia.

We present a series of arguments for logical nativism, focusing mainly on the meaning of disjunction in human languages. We propose that all human languages are logical in the sense that the meaning of linguistic expressions corresponding to disjunction (e.g. English 'or', Chinese 'huozhe', Japanese 'ka') conform to the meaning of the logical operator in classical logic, inclusive-'or'. It is highly implausible, we argue, that children acquire the (logical) meaning of disjunction by observing how adults use disjunction. Findings from studies of child language acquisition and from cross- linguistic research invite the conclusion that children do not learn to be logical—it comes naturally to them.

This volume is the first of a two-volume collection on mental states. The contributions to this volume focus on evolutionary and functional aspects of certain mental states in an effort to understand their nature, whereas the second volume is concerned with the question what language and language use reveals about cognitive structure and underlying cognitive categories. Questions that are addressed in this volume include: (i) how early did cognitive states of a sort rich enough to support communication and planning appear in the evolutionary history of hominids?; (ii) is it possible to infer the existence of sophisticated cognitive states from evidence of tool use?; (iii) how do mental states represent situations or events or actions?; (iv) how can we theoretically model mental states?; (v) how can we simulate mental states and their functions?; and (vi) what insights can conceptual categorisation - both linguistic and non-linguistic - give us into the organisation and structure of the mind and hence of mental states? The volume contains contributions from psychologists, linguists, artificial intelligence researchers, neuroscientists, archaeologists and philosophers, bringing together scholars from the diverse fields of cognitive science, or more specifically, the study of language and cognition. This reflects the provenance of the chapters, most of which were presented at the 'International Language and Cognition Conference', held in September 2004 at Pacific Bay Resort in Coffs Harbour, Australia.