Research has shown that bilingual individuals might encode autobiographical memories in either their first language (L1) or their second language (L2), depending on the language spoken at the time of the event. Although language mixing is a common occurrence among multilingual speakers, previous studies have largely overlooked mixed…

Heritage Language Instruction (HLI) is a resource used in many immigration-receiving countries that allows students with an immigrant background to continue to be in contact with their Heritage Language (HL). However, many of the psycholinguistic effects of this instruction are still unknown. This study aims to provide an in-depth view of the…

The linguistic interdependence hypothesis posits the existence of language features common to different languages. This set of characteristics, known as Common Underlying Proficiency (CUP), is a powerful facilitating agent in second language acquisition. Fluid intelligence (Gf), on the other hand, is the construct that encompasses those cognitive…

This study examined whether the linguistic distance between the first (L1) and second (L2) language is a significant determinant of L2 writing skills of 292 adult immigrants from 39 different source countries, who were beginner learners of Spanish L2. Gender, age, length of residence in Spain, education level as a proxy for literacy skills in L1,…

This dissertation examines the linguistic behavior of code-switching in three groups of highly proficient Cantonese-English bilinguals. Code-switching refers to alternating between two or more languages within the same sentence or between two sentences. While traditional research on bilingualism often compares bilingual speakers against…

Word knowledge and the speed of word processing in monolingual children and adults are influenced by word properties, such as the age of acquisition (AoA), imageability, and frequency. Understanding how different properties of words contribute to the ease of processing by bilingual children is a critical step for establishing models of childhood…

We investigated age-related decline in adult learning of Dutch as an additional language (Ln) in speaking, writing, listening, and reading proficiency test scores for 56,024 adult immigrants with 50 L1s who came to the Netherlands for study or work. Performance for all four language skills turned out to decline monotonically after an age of…

When an adult migrant begins to acquire a second language, it is often presumed that the learner is already equipped with first language literacy and can therefore transfer these same literacy skills during their acquisition of the new, second language. However, many adult second language (L2) learners lack the opportunity to develop first…

Introduction: The development of immigrant students' language proficiency is one of the main challenges facing education professionals today. Our study was a longitudinal analysis of Catalan and Spanish language acquisition. Method: Participants were 72 immigrant students (27 Spanish speakers and 45 non-Spanish speakers) enrolled in compulsory…