Individual Differences in Language Ability and Language Behavior is a collection of papers that discusses differences at the center of the study of language, specifically, on the various dimensions of linguistic ability and behavior along which individuals can differ from each other. Papers also review the development of techniques that measure these dimensions in relation to biological, psychological, and cultural parameters. Some papers review individual differences in language study in terms of different perspectives: that of a psychometrician's, of an individualistic's vantage point, and of a psycholinguistic's. Other papers discuss how each individual accesses, uses, and judges his language through fluency, biases, spatial principles, or a linguistic-phonetic mode. Several papers examine individual differences in language acquisition, such as "profile analysis," strategies in acquisition of sounds, second language learning, and duplication of adult language system. A group of papers addresses the biological aspects of language variation. These biological aspects include selective disorders of syntax (agrammatism), selective disorders of lexical retrieval (anomia), and cerebral lateralization effects in language processing. Certain papers explain individual differences in languages using sociolinguistic analysis. The collection is well suited for linguists, ethnologists, psychologists, and researchers whose works involve linguistics, learning, communications, and syntax.

The scope of individual learner differences is broad, yet there is no current, comprehensive, and unified volume that provides an overview of the considerable amount of research conducted on various language learner differences, until now.

Understanding the way in which learners differ from one another is of fundamental concern to those involved in second-language acquisition, either as researchers or teachers. This account is the first to review at book length the important research into differences, considering matters such as aptitude, motivation, learner strategies, personality and interaction between learner characteristics and types of instruction.

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How do we manage to speak and understand language? How do children acquire these skills and how does the brain support them? This book provides a fascinating personal history of the men and women whose intelligence, brilliant insights, fads, fallacies, cooperations, and rivalries created the discipline we call psycholinguistics.

Topics include the linguist's attitude, the work session and the roles of native speakers.

Second language learners differ in how successfully they adapt to, and profit from, instruction. This book aims to show that adaptation to L2 instruction, and subsequent L2 learning, is a result of the interaction between learner characteristics and learning contexts. Describing and explaining these interactions is fundamentally important to theories of instructed SLA, and for effective L2 pedagogy. This collection is the first to explore this important issue in contemporary task-based, immersion, and communicative pedagogic settings. In the first section, leading experts in individual differences research describe recent advances in theories of intelligence, L2 aptitude, motivation, anxiety and emotion, and the relationship of native language abilities to L2 learning. In the second section, these theoretical insights are applied to empirical studies of individual differences-treatment interactions in classroom learning, experimental studies of the effects of focus on form and incidental learning, and studies of naturalistic versus instructed SLA.