| Measuring cortical thickness is important for gaining a better understanding of the extent to which the brain is responsible for processing first and second language acquisition in order to give the most appropriate methods and approaches to second language learning. There has been extensive investigating research about the relationship between cortical thickness and language learning and the effects of learning a second language on brain structure. This research aims to determine the types of neuroplasticity that occurs in the study of brain changes in response to effects of age of second language acquisition (AOA-L2) in a sequential bilingual, to reveal the effects of age of second language acquisition (AOA-L2) of the cortical thickness in left IFG and right IFG by using automated measurement of cortical thickness from MRI scans and attempts to quantify bilingual participant experience. This study particularly sought to investigate age effects of second language acquisition on the two brain regions, left IFG and Right IFG. The research specifically addressed three research questions: 1.) What is the type of neuroplasticity that occurs in the study of brain changes in response to effects of age of second language acquisition (AOA-L2) in a sequential bilingual? 2.) How does age of second language acquisition (AOA-L2) affect the thickness of the cortex in left IFG and right IFG? 3.) How does a bilingual participant perceive their bilingualism process? Descriptive research was used as methodology to focus on characterizing a population, circumstance, or event under study. The theoretical section of this study discusses research on Types of neuroplasticity (Demarin, Morovic, & Béne, 2014), Sensorimotor Hypothesis (Hernandez and Li, 2007), Bilingualism categories (Valdés and Figueroa, 1994), Types of bilingualism (Tabors (1997), The reason for people become bilinguals (Grosjean ,1982). The findings of this study suggested that the effect of age of second language learning at early year by measuring the cortical thickness has no additional effect on the left IFG brain region as the hemisphere dominant for language. The result also provide evidence that the cortical thickness changes in right brain shows that the age of acquisition is not the only factor that affects brain anatomy. |