title: The effects of age on second language grammar and speech production.
abstract: The current study examined the age of learning effect on second language (L2) acquisition. The research goals of the study were twofold: to test whether there is an independent age effect controlling for other potentially confounding variables, and to clarify the age effect across L2 grammar and speech production domains. The study included 118 Mandarin-speaking immigrants and 24 native English speakers. Grammar knowledge was assessed by a grammaticality judgment task, and speech production was measured by native English speaking raters' ratings of participants' foreign accents. Results from the study revealed that the age of learning effect was robust for both L2 domains even after controlling for the influences of other variables, such as length of residence and years of education in the United States. However, the age of learning variable had a stronger impact on speech production than on grammar. The current results support the framework of multiple critical/sensitive periods (Long in Int Rev Appl Linguist 43(4):287-317, 2005; Newport et al. in Language, brain and cognitive development: Essays in honor of Jacques Mehler. MIT Press, Cambridge, MA, 2001; Werker and Tees in Dev Psychobiol 46(3):233-251, 2005).
authors: Department of Bicultural-Bilingual Studies, University of Texas San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA, becky.huang@utsa.edu.
authors: Becky H
authors: BH
authors: Huang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007802:Language; D008037:Linguistics; D008297:Male; D019303:Multilingualism; D013060:Speech / Q000502:physiology*; D055815:Young Adult
references: Lang Speech. 2006;49(Pt 4):521-48
references: 17326590
references: J Acoust Soc Am. 2006 Feb;119(2):1118-30
references: 16521773
references: Lang Speech. 2011 Sep;54(Pt 3):387-414
references: 22070045
references: Dev Sci. 2011 Sep;14(5):949-59
references: 21884311
references: J Child Lang. 2010 Nov;37(5):1123-32
references: 19951452
references: Psychol Sci. 2003 Jan;14(1):31-8
references: 12564751
references: Psychol Sci. 2002 May;13(3):238-43
references: 12009044
references: Dev Psychobiol. 2005 Apr;46(3):233-51
references: 15772961
references: J Acoust Soc Am. 1995 May;97(5 Pt 1):3125-34
references: 7759652
references: Brain Lang. 1975 Jul;2(3):356-68
references: 1182501
references: Cognition. 1991 Jun;39(3):215-58
references: 1841034
references: J Cogn Neurosci. 1996 Summer;8(3):231-56
references: 23968150
references: Cognition. 2003 Jan;86(3):B53-64
references: 12485742
references: Cognition. 1991 Sep;40(3):159-201
references: 1786674
references: J Speech Lang Hear Res. 2007 Aug;50(4):940-67
references: 17675598
references: Cogn Psychol. 1989 Jan;21(1):60-99
references: 2920538
references: Brain Lang. 2003 Dec;87(3):369-84
references: 14642540
references: J Acoust Soc Am. 2003 Jul;114(1):465-74
references: 12880057