A Critical Review of Language Aptitude.

Individual differences have been the center of attention of a considerable number of linguists and educators for decades (see, e.g., Krashen, 1980; Skehan, 1989, 2014; Larsen-Freeman & Long, 1991; Dornyei, 2006; Robinson, 2012). This could be attributed to the hypothesis that individual differences are fundamental psychological factors which could predict success or failure of a language learner (Lightbown & Spada, 2006). Aptitude factor is one of these major and controversial individual characteristics (Brown, 2007). It is believed that language aptitude is one of the primary learner attributes noticeably involved in second language acquisition (Skehan, 1989). It is also assumed to be the most successful predictor of language learning attainment (Gardner & MacIntyre, 1992). This has been supported in a study conducted by DeKeyser, Alfi-Shabtay, and Ravid (2010) who concluded that language learning aptitude can play a fundamental role in adult second language acquisition. That could be attributed to the aptitude tests such as Modern Language Aptitude Test (MLAT) which have been proved to have positive relation with language learning. For instance, Bain, McCallum, Bell, Cochran, and Sawyer (2010) indicated that MLAT could be "the strongest predictor of foreign language learning success" (p. 140). [ABSTRACT FROM AUTHOR]