title: How age of bilingual exposure can change the neural systems for language in the developing brain: a functional near infrared spectroscopy investigation of syntactic processing in monolingual and bilingual children.
abstract: Is the developing bilingual brain fundamentally similar to the monolingual brain (e.g., neural resources supporting language and cognition)? Or, does early-life bilingual language experience change the brain? If so, how does age of first bilingual exposure impact neural activation for language? We compared how typically-developing bilingual and monolingual children (ages 7-10) and adults recruit brain areas during sentence processing using functional Near Infrared Spectroscopy (fNIRS) brain imaging. Bilingual participants included early-exposed (bilingual exposure from birth) and later-exposed individuals (bilingual exposure between ages 4-6). Both bilingual children and adults showed greater neural activation in left-hemisphere classic language areas, and additionally, right-hemisphere homologues (Right Superior Temporal Gyrus, Right Inferior Frontal Gyrus). However, important differences were observed between early-exposed and later-exposed bilinguals in their earliest-exposed language. Early bilingual exposure imparts fundamental changes to classic language areas instead of alterations to brain regions governing higher cognitive executive functions. However, age of first bilingual exposure does matter. Later-exposed bilinguals showed greater recruitment of the prefrontal cortex relative to early-exposed bilinguals and monolinguals. The findings provide fascinating insight into the neural resources that facilitate bilingual language use and are discussed in terms of how early-life language experiences can modify the neural systems underlying human language processing.
authors: University of Toronto, Canada; Gallaudet University, USA.
authors: K K
authors: KK
authors: Jasinska
authors: L A
authors: LA
authors: Petitto
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000375:Aging; D001921:Brain / Q000254:growth & development* / Q000502:physiology; D002648:Child; D003071:Cognition; D005260:Female; D006801:Humans; D007804:Language Development; D008037:Linguistics; D008297:Male; D019303:Multilingualism; D009415:Nerve Net / Q000254:growth & development; D017397:Prefrontal Cortex / Q000254:growth & development; D019265:Spectroscopy, Near-Infrared; D013702:Temporal Lobe / Q000254:growth & development; D055815:Young Adult
keywords: Bilingualism; Language development; Neural Signature Hypothesis; Sentence processing; Syntax; fNIRS neuroimaging
references: Clin Neurophysiol. 2011 Sep;122(9):1706-17
references: 21414839
references: J Speech Lang Hear Res. 2006 Aug;49(4):856-66
references: 16908880
references: Neuroimage. 2011 Jan 1;54(1):577-93
references: 20656040
references: Neuroimage. 2009 Jan 15;44(2):428-47
references: 18848897
references: J Cogn Neurosci. 1998 Jul;10(4):541-52
references: 9712683
references: Neurosci Bull. 2013 Jun;29(3):381-9
references: 23385388
references: Neuroimage. 2003 Oct;20(2):1215-25
references: 14568490
references: Cereb Cortex. 2001 Oct;11(10):946-53
references: 11549617
references: J Child Lang. 1995 Oct;22(3):611-31
references: 8789516
references: Cogn Psychol. 1989 Jan;21(1):60-99
references: 2920538
references: Neuroreport. 2009 Apr 22;20(6):563-8
references: 19287322
references: Nat Neurosci. 2002 Jan;5(1):76-80
references: 11753419
references: J Psycholinguist Res. 2001 May;30(3):297-320
references: 11523276
references: J Cogn Neurosci. 2008 Apr;20(4):643-56
references: 18052788
references: Hum Brain Mapp. 2000 Feb;9(2):65-71
references: 10680763
references: Hum Brain Mapp. 2003 Jun;19(2):112-31
references: 12768535
references: Neuroimage. 2008 Feb 1;39(3):1457-71
references: 18054251
references: Neuroimage. 2005 Oct 1;27(4):842-51
references: 15979346
references: Brain Lang. 2009 May-Jun;109(2-3):112-23
references: 18976807
references: Brain Lang. 1998 Oct 1;64(3):282-96
references: 9743543
references: Biling (Camb Engl). 2008 Jul 1;11(2):203-223
references: 19823598
references: Brain Lang. 2000 Feb 1;71(2):310-36
references: 10716864
references: Brain Lang. 2012 May;121(2):79-89
references: 21507474
references: J Vis Exp. 2009 Jul 28;(29):
references: 19638948
references: J Child Lang. 2001 Jun;28(2):453-96
references: 11449947
references: Biling Res J. 2013 Apr 1;36(1):35-60
references: 23794952
references: Proc Natl Acad Sci U S A. 2004 Oct 19;101(42):15265-70
references: 15469927
references: Behav Res Methods. 2007 Nov;39(4):723-30
references: 18183884
references: Hum Brain Mapp. 2002 Jul;16(3):133-45
references: 12112767
references: Proc Natl Acad Sci U S A. 2000 Dec 5;97(25):13961-6
references: 11106400
references: Hum Brain Mapp. 2002 Jan;15(1):26-38
references: 11747098
references: J Psycholinguist Res. 2001 May;30(3):339-64
references: 11523278
references: Annu Rev Psychol. 2003;54:91-114
references: 12359916
references: Brain. 1998 Oct;121 ( Pt 10):1841-52
references: 9798741
references: Brain Lang. 2010 Aug;114(2):90-100
references: 20627366
references: J Speech Lang Hear Res. 2001 Dec;44(6):1338-53
references: 11776369
references: Brain Lang. 2003 Jul;86(1):70-82
references: 12821416
references: Curr Opin Neurobiol. 2013 Apr;23(2):250-4
references: 23146876
references: Cortex. 2008 Mar;44(3):257-75
references: 18387556
references: Brain Lang. 2012 May;121(2):130-43
references: 21724244
references: J Cogn Neurosci. 2008 Jan;20(1):153-69
references: 17919083
references: Neuron. 2003 Jan 9;37(1):159-70
references: 12526781
references: Brain Lang. 1996 Mar;52(3):452-73
references: 8653390
references: Philos Trans R Soc Lond B Biol Sci. 2005 Apr 29;360(1456):781-95
references: 15937012
references: Child Dev. 1987 Jun;58(3):539-59
references: 3038480
references: Neuroimage. 2012 Aug 15;62(2):816-47
references: 22584224
references: Women Health. 1999;29(1):57-72
references: 10427641
references: Hum Brain Mapp. 2009 Nov;30(11):3625-35
references: 19399820
references: Cereb Cortex. 2001 Aug;11(8):754-60
references: 11459765
references: Brain Lang. 2010 Aug;114(2):115-25
references: 20656105
references: Hum Brain Mapp. 2003 Jul;19(3):170-82
references: 12811733
references: Brain Res Cogn Brain Res. 2005 Dec;25(3):982-93
references: 16310346
references: J Biomed Opt. 2009 May-Jun;14(3):034004
references: 19566297
references: J Cogn Neurosci. 2002 May 15;14(4):550-60
references: 12126497
references: J Cogn Neurosci. 2002 Oct 1;14(7):994-1017
references: 12419124
references: J Cogn Neurosci. 1996 Summer;8(3):231-56
references: 23968150
references: Cortex. 2006 May;42(4):591-604
references: 16881269
references: Nature. 2004 Oct 14;431(7010):757
references: 15483594
references: Neuroimage. 2006 May 15;31(1):366-75
references: 16460968