Studies with U.S. secondary second language (L2) learners have revealed individual differences (IDs) in first language (L1) skills and L2 aptitude and shown that these IDs are related to L2 achievement and proficiency. In this study, U.S. students were administered measures of L1 achievement, L1 cognitive processing, and L2 aptitude; followed…

Foreign language educators have developed measures to assess the proficiency of U.S. high school learners. Most have compared language learners to clearly defined criteria for proficiency in the language (criterion-referenced assessment) or to the performance of other monolingual English speakers (norm-referenced assessment). In this study, the…

The simple view of reading (SVR) model proposes that reading comprehension is the product of word decoding and language comprehension, and that both components make independent contributions to reading skill (Gough & Tunmer, 1986). The model posits that there are good readers and three types of poor readers--dyslexic, hyperlexic, and garden…

In this article, I describe studies conducted over 25 years with secondary and post-secondary L2 learners in the United States. The evidence from these studies shows that there are important connections between students' early L1 skills and their L2 aptitude and L2 proficiency and that individual differences in students' L1 skills in elementary…

The Linguistic Coding Deficit Hypothesis offers an alternative to affective explanations for second-language learning difficulties and adds another dimension to the role of aptitude. The hypothesis focuses on phonological, syntactic, and semantic components of language and assumes that the individual's control over these components is crucial to…

Comparison of high-risk, low-risk, and learning-disabled high school students' foreign language performance found clear evidence of significant differences in the foreign language learning potential of low- and high-risk students and striking similarities between high-risk and learning-disabled students regarding foreign language learning…

Information about the foreign language academic history, learning attitudes, and academic skills was gathered from high-risk students, low-risk students, and students with learning disabilities. Findings are interpreted in light of the Linguistic Coding Deficit Hypothesis, which speculates that foreign-language learning problems are related to…

Based on the results of native and foreign language assessments of high school learners, it is inferred that students with foreign language learning difficulties have subtle but underlying native language learning difficulties, especially in the phonological and syntactic codes of language. Implications for diagnosis and teaching are discussed.…

Reports two studies comparing college students classified as learning disabled (LD) or as both LD and having attention deficit hyperactivity disorder (ADHD) who had either substituted courses for a foreign language requirement or had fulfilled the requirement by passing foreign language courses. Findings suggest students classified as both LD and…

Two studies that included high school students classified as at risk for learning a foreign language are described. The first compared at-risk students classified as learning disabled with at-risk students not classified as LD. The second investigated only students classified as LD, comparing them with and without discrepancies between their…

A discussion of the Linguistic Coding Deficit Hypothesis presents an overview of the theory; describes five prototypes of second-language learners, each illustrated by a distinct language processing profile; and examines how the ability to identify prototypes can help teachers interpret student difficulties and design instruction to address them.…