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Cited by 798Language Development and DisordersChild and Animal Learning DevelopmentInfant Health and Development

Brain mechanisms in early language acquisition

Open access
Kuhl, Patricia K.·2010·Neuron
DOI 10.1016/j.neuron.2010.08.038PMC PMC2947444
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Abstract

Summary The last decade has produced an explosion in neuroscience research examining young children’s early processing of language. Noninvasive, safe functional brain measurements have now been proven feasible for use with children starting at birth. The phonetic level of language is especially accessible to experimental studies that document the innate state and the effect of learning on the brain. The neural signatures of learning at the phonetic level can be documented at a remarkably early point in development. Continuity in linguistic development from infants’ earliest brain responses to phonetic stimuli is reflected in their language and pre-reading abilities in the second, third and fifth year of life, a finding with theoretical and clinical impact. There is evidence that early mastery of the phonetic units of language requires learning in a social context. Neuroscience on early language learning is beginning to reveal the multiple brain systems that underlie the human language faculty.

AI snapshot

Written from the paper’s full text.

TL;DR

This review argues that infants’ early phonetic learning involves neural commitment to native-language sound patterns, with sensitive periods and bidirectional effects on later language. It also proposes that social interaction gates computational/statistical learning, since live exposure—but not television or audio-only exposure—supported foreign-language phonetic learning in infants.

Key findings

  • Noninvasive brain measures (EEG/ERP, MEG, fMRI, NIRS) can be used from infancy. ERP mismatch negativity at 7.5 months predicted later language: stronger native phonetic discrimination predicted higher language scores at 14, 18, 24, and 30 months, while stronger nonnative discrimination predicted lower later scores. Vowel discrimination at 6 months also predicted language and pre-reading skills at age 5.
  • Phonetic perception changes between 6 and 12 months: nonnative discrimination declines while native discrimination increases. Japanese infants’ discrimination of English /r/–/l/ declined between 8 and 10 months, whereas American infants’ discrimination of the same contrast increased.
  • Live social exposure mattered: 9-month-old American infants exposed to Mandarin in 12 live sessions over 4–5 weeks, from four speakers and about 33,000 syllables, learned a Mandarin phonetic contrast and performed comparably to same-age infants in Taiwan with 10 months of Mandarin exposure. Television or audiotape exposure produced no learning. Social engagement and gaze shifting predicted ERP measures of Spanish phonetic and word learning.
  • Sensitive periods differ by language level: phonetic learning is most affected before the end of the first year, syntax flourishes between 18 and 36 months, and vocabulary expands at 18 months but is less age-restricted. Languages contain roughly 600 consonants and 200 vowels, with each language using about 40 phonemes.

Methods

  • Narrative review and synthesis of behavioral and noninvasive functional brain studies in infants and children, including EEG/ERP, MEG, fMRI, and NIRS, plus comparative animal research.
  • Focuses on phonetic perception, statistical learning, social interaction, bilingual experience, and critical periods; no new primary experiment is reported.
  • Draws on longitudinal, training, and cross-cultural studies using behavioral discrimination tasks and neural measures such as the mismatch negativity.

Limitations

  • The paper states that many questions remain about how cognitive skills and social interaction affect natural speech learning, that the precise timing of critical periods at each language level cannot yet be documented, and that understanding of the underlying brain mechanisms is still nascent.
  • Evident from the text: as a narrative review, it does not describe a systematic search or report primary data, and several cited findings are in press, submitted, or in preparation, so not all evidence is peer-reviewed or published.
  • Evident from the text: sample sizes and effect sizes for most cited infant studies are not provided, limiting assessment of the strength and generalizability of individual findings.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.neuron.2010.08.038

Cites

156 of 157 references verified0 citation errors · 1 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

20 of 139 cited sources checked · 12 supported · 0 flagged · accuracy not yet measured

  • Premisecitation

    A reduction in initial flexibility with age dramatically decreases the capacity to acquire a new language as adults.

    “We are in a nascent stage of understanding the brain mechanisms underlying infants’ early flexibility with regard to the acquisition of language – their ability to acquire language by eye or by ear, and acquire one or multiple languages – and also the reduction in this initial flexibility that occurs with age, which dramatically decreases our capacity to acquire a new language as adults (Newport,”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Newport, 1990 source
  • Premisecitation

    NIRS has been used with infants in the first two years of life to test responses to phonemes and longer stretches of speech.

    “Reports have begun to appear on infants in the first two years of life, testing infant responses to phonemes as well as longer stretches of speech such as “motherese” and forward versus reversed sentences (Bortfeld et al., 2007; Homae et al., 2006; Peña et al., 2002; Taga and Asakawa, 2007).”
    Quote in the paperNot a substantial claim1 of 3 sources checked
    • cites Bortfeld et al., 2007 source
    • cites Homae et al., 2006 source
    • cites Peña et al., 2002

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Premisecitation

    Infants initially hear all phonetic differences.

    “An important discovery in the 1970s was that infants initially hear all these phonetic differences (Eimas, 1975; Eimas et al., 1971; Lasky et al., 1975; Werker and Lalonde, 1988).”
    Quote in the paperSubstantial claim2 of 3 sources checked
    • cites Eimas, 1975 source

      The paper reports that 2- and 3-month-old infants discriminate the /r–l/ contrast, and its Discussion proposes early sensitivity to “most, if not all” phonetic distinctions. That supports broad early sensitivity, but the paper does not establish as fact that infants initially hear all phonetic differences. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
    • cites Eimas et al., 1971 source

      The paper’s abstract (section “Speech Perception in Infants”; page unavailable) reports that 1- and 4-month-old infants discriminated synthetic speech sounds across a voiced–voiceless stop-consonant boundary. That supports early sensitivity to a phonetic difference, but the study tested one acoustic dimension, voice onset time, and does not establish that infants initially hear all phonetic differences. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites Lasky et al., 1975 source
  • Premisecitation

    Infants integrate the auditory and visual instantiations of speech.

    “Furthermore, while previous studies show that infants integrate the auditory and visual instantiations of speech (Kuhl and Meltzoff, 1982; Patterson and Werker, 1999), more recent studies show that infants’ detection of statistical patterns in speech stimuli, like those used by Maye and her colleagues, is influenced both by the auditory event and the sight of a face articulating the sounds.”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites Kuhl and Meltzoff, 1982 source
    • cites Patterson and Werker, 1999 source
  • Premisecitation

    Sleeping newborns detect statistical structure in speech, as shown by event-related brain potential studies.

    “Recent findings show that even sleeping newborns detect this kind of statistical structure in speech, as shown in studies using event-related brain potentials (Teinonen et al., 2009).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Teinonen et al., 2009 source
  • May combine two claims. 47
  • Classified as probably not a substantial claim. 9

  • May combine two claims.

    Premisecitation

    Brain and behavioral studies indicate a complex set of interacting brain systems in initial language acquisition, many of which appear to reflect adult language processing even early in infancy.

    “In the last decade, brain and behavioral studies indicate a very complex set of interacting brain systems in the initial acquisition of language, many of which appear to reflect adult language processing, even early in infancy (Dehaene-Lambertz et al., 2006).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Dehaene-Lambertz et al., 2006 source

  • May combine two claims.

    Premisecitation

    Statistical learning occurs in nonhuman animals and in humans for non-speech musical and visual patterns.

    “Statistical learning has been shown in nonhuman animals (Hauser et al., 2001), and in humans for stimuli outside the realm of speech, operating for musical and visual patterns in the same way as speech (Fiser and Aslin, 2002; Kirkham et al., 2002; Saffran et al., 1999).”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites Hauser et al., 2001 source
    • cites Fiser and Aslin, 2002 source

      The Abstract and Results and Discussion report that 9-month-old infants learn statistical relationships in visual scenes, supporting the visual-pattern part of the citation. This paper does not establish that visual learning operates in the same way as speech learning; the sentence cites other works for the animal and musical-pattern claims. (LLM, conf=0.82)

      Experimental — accuracy not yet measured
    • cites Kirkham et al., 2002 source

  • May combine two claims.

    Premisecitation

    Imada et al. reported synchronized auditory and motor area activation at 6 and 12 months, and Dehaene et al. reported motor speech area activation in 3-month-olds.

    “Imada et al. reported synchronized activation in response to speech in auditory and motor areas at 6 and 12 months, and Dehaene et al. reported activation in motor speech areas in response to sentences in 3-month-olds.”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites Imada et al., 2006 source
    • cites Dehaene et al., 2006 source

  • May combine two claims.

    Premisecitation

    Induced brain rhythms are linked to attention and cognitive effort, and adult MEG studies show increased cognitive effort when processing nonnative speech.

    “The induced brain rhythms have been linked to attention and cognitive effort, and are of primary interest since MEG studies with adults have shown that cognitive effort is increased when processing nonnative speech (Zhang et al., 2005; 2009).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites Zhang et al., 2005 source
    • cites Zhang et al., 2009 source

      The Discussion (Relationships between Brain Plasticity, Neural Sensitivity and Efficiency; page unavailable) reports greater overall MEG activation in Japanese than American adults processing the /r-l/ contrast, consistent with less efficient processing of that nonnative contrast. It does not establish increased cognitive effort directly or link induced brain rhythms to attention and effort; its attention-related discussion concerns regional activation. (LLM, conf=0.82)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Adults can improve nonnative phonetic perception under more social training conditions, and MEG shows neural efficiency increases after training.

    “Training studies show that adults can improve nonnative phonetic perception when training occurs under more social learning conditions, and MEG measures before and after training indicate that neural efficiency increases after training (Zhang et al., 2009).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Zhang et al., 2009 source

      The Discussion reports improved English /r–l/ identification by Japanese adults, and the Abstract reports pre–post MEG changes consistent with increased neural efficiency. But the Materials and Methods describe computer-based training with infant-directed-speech features, not training under social learning conditions. Those features may make the training more socially informed, but the paper does not establish the claimed social condition. (LLM, conf=0.87)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Findingcitation

    Japanese infants' discrimination of English r-l declines between 8 and 10 months of age, while American infants' discrimination of the same sounds increases.

    “Japanese infants’ discrimination of English r-l declines between 8 and 10 months of age, while at the same time in development, American infants’ discrimination of the same sounds shows an increase (Kuhl et al., 2006) (Figure 3).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Kuhl et al., 2006 source

  • May combine two claims.

    Findingown data

    At the same time that nonnative phonetic perception declines, native language speech perception shows a significant increase.

    “Work in this laboratory also established a new fact: At the same time that nonnative perception declines, native language speech perception shows a significant increase.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Findingown data

    Infants who shifted gaze between the tutor's eyes and new toys during Spanish exposure showed more negative MMN to a Spanish phonetic contrast, while those with fewer gaze shifts showed less negative MMN.

    “Infants who shifted their gaze between the tutor’s eyes and newly introduced toys during the Spanish exposure sessions showed a more negative MMN (indicating greater neural discrimination) in response to the Spanish phonetic contrast. Infants who simply gazed at the tutor or at the toy, showing fewer gaze shifts, produced less negative MMN responses.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Findingcitation

    In Spanish exposure studies, infants with greater phonetic learning had higher post-exposure cognitive control scores, while pre-exposure cognitive control did not differ.

    “In support of this view, it is noteworthy that in the Spanish exposure studies, a median split of the post-exposure MMN phonetic discrimination data revealed that infants showing greater phonetic learning had higher cognitive control scores post-exposure. These same infants did not differ in their pre-exposure cognitive control tests (Conboy, Sommerville, and Kuhl, in preparation).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Conboy, Sommerville, and Kuhl, in preparation

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Findingcitation

    Spanish exposure studies confirmed learning of Spanish phonetic and lexical units.

    “The results confirmed Spanish language learning, both of the phonetic units of the language and the lexical units of the language (Conboy and Kuhl, in press).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Conboy and Kuhl, in press

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Findingcitation

    When hearing Spanish but not English, exposed infants produced a new vocalization pattern reflecting Spanish prosody rather than English; this occurred only in response to Spanish and only in infants exposed to Spanish in the laboratory.

    “When presented with language from a Spanish speaker (but not from an English speaker), a new pattern of infant vocalizations was evoked, one that reflected the prosodic patterns of Spanish, rather than English. This only occurred in response to Spanish, and only occurred in infants who had been exposed to Spanish in the laboratory experiment.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Structural MRI measures in young infants identify the size of brain structures and are related to language abilities later in childhood.

    “Structural MRI measures in young infants identify the size of various brain structures and these measures have been shown to be related to language abilities later in childhood (Ortiz-Mantilla, Choe, Flax, Grant, and Benasich, 2010).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ortiz-Mantilla, Choe, Flax, Grant, and Benasich, 2010 source

  • May combine two claims.

    Premisecitation

    In adulthood, language is highly modularized, which accounts for specific patterns of language deficits and brain damage after stroke.

    “In adulthood, language is highly modularized, which accounts for the very specific patterns of language deficits and brain damage in adult patients following stroke (Kuhl and Damasio, in press).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Kuhl and Damasio, in press

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationnone given

    Exposure to two languages early in infancy produces a bilingual brain.

    “We are also beginning to discover how exposure to two languages early in infancy produces a bilingual brain.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning

    The assertion that social factors gate language learning explains typical language development, autism's twin deficits in social cognition and language, and why nonhuman animals with strong computational abilities do not acquire language.

    “The assertion that social factors gate language learning explains not only how typically developing children acquire language, but also why children with autism exhibit twin deficits in social cognition and language, and why nonhuman animals with impressive computational abilities do not acquire language.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    The infant brain is exquisitely poised to crack the speech code in a way that the adult brain cannot.

    “The infant brain is exquisitely poised to “crack the speech code” in a way that the adult brain cannot.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisereasoning

    Spanish-learning infants must distinguish phonetic units critical to Spanish words, whereas English-learning infants combine them into a single category.

    “Similarly, Spanish learning infants must distinguish phonetic units critical to Spanish words (bano and pano), whereas English learning infants must combine them into a single category (English b).”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisereasoning

    Infants are exposed to many more phonetic variants than will be used phonemically and must derive the appropriate groupings used in their specific language.

    “But infants are exposed to many more phonetic variants than will be used phonemically, and have to derive the appropriate groupings used in their specific language.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationcitation

    The increase observed in native-language phonetic perception represents a critical step in initial language learning and promotes language growth.

    “We argued that the increase observed in native-language phonetic perception represented a critical step in initial language learning and promoted language growth (Kuhl et al., 2006).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Kuhl et al., 2006 source

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The world's languages contain approximately 600 consonants and 200 vowels.

    “The world’s languages contain approximately 600 consonants and 200 vowels (Ladefoged, 2001).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ladefoged, 2001

  • May combine two claims.

    Premisecitation

    Japanese adults produce both English r- and l-like sounds, exposing Japanese infants to both sounds.

    “The variability in speech input is simply too enormous; Japanese adults produce both English r- and l- like sounds, exposing Japanese infants to both sounds (Lotto et al., 2004; Werker et al., 2007).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Lotto et al., 2004
    • cites Werker et al., 2007 source

  • Classified as probably not a substantial claim.

    Interpretationcitation

    Neural commitment is the idea that neural circuitry and overall architecture develops early in infancy to detect the phonetic and prosodic patterns of speech.

    “Work in my laboratory led me to advance the concept of neural commitment, the idea that neural circuitry and overall architecture develops early in infancy to detect the phonetic and prosodic patterns of speech (Kuhl, 2004; Zhang et al., 2005, 2009).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Kuhl, 2004 source
    • cites Zhang et al., 2005, 2009

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisereasoning

    Japanese-learning infants group the phonetic units r and l into a single phonemic category, whereas English-learning infants uphold the distinction.

    “Japanese-learning infants have to group the phonetic units r and l into a single phonemic category (Japanese r), whereas English-learning infants must uphold the distinction to separate rake from lake.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisenone given

    Vocabulary development explodes at 18 months of age but is not as restricted by age as other aspects of language learning; new vocabulary items can be learned at any age.

    “Vocabulary development “explodes” at 18 months of age, but does not appear to be as restricted by age as other aspects of language learning—one can learn new vocabulary items at any age.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisenone given

    Adult English and Japanese speakers produce both English r- and l-like sounds, but English speakers hear them as distinct and Japanese adults hear them as identical.

    “To illustrate, adult speakers of English and Japanese produce both English r- and l-like sounds, even though English speakers hear /r/ and /l/ as distinct and Japanese adults hear them as identical.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisenone given

    Distributional frequency analyses show differential patterns: in English /r/ and /l/ occur very frequently, while in Japanese the most frequent sound of this type is Japanese /r/, related to but distinct from both English variants.

    “However, distributional frequency analyses of English and Japanese show differential patterns of distributional frequency; in English, /r/ and /l/ occur very frequently; in Japanese, the most frequent sound of this type is Japanese /r/ which is related to but distinct from both the English variants.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    In a phonetic discrimination task, infants discriminated /da/ from /ta/ when each sound was paired with a matching face articulating it, but not when a single face accompanied all sounds.

    “contrast when each auditory stimulus was paired with the appropriate face articulating either /da/ or /ta/; discrimination did not occur if only one face was used with all auditory stimuli (Teinonen et al., 2008).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Teinonen et al., 2008 source

  • May combine two claims.

    Premisecitation

    Six-month-old infants in Sweden and the United States responded uniquely to native-language vowel prototypes, the distributional mean of adult productions, and not to foreign-language vowel prototypes.

    “Infants tested in Sweden and the United States at 6 months of age showed a unique response to vowel sounds that represent the distributional mean in productions of adults who speak the language (i.e., “prototypes”); this response was shown only for stimuli infants had been exposed to in natural language (native-vowel prototypes), not foreign-language vowel prototypes (Kuhl et al., 1992).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Kuhl et al., 1992 source

  • May combine two claims.

    Premisecitation

    Statistical learning is computational and implicit, relies on automatically picking up statistical regularities in sensory input, and strongly influences phonetic learning and early word learning.

    “Statistical learning is computational in nature, and reflects implicit rather than explicit learning. It relies on the ability to automatically pick up and learn from the statistical regularities that exist in the stream of sensory information we process, and strongly influences both phonetic learning and early word learning.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Saffran et al., 1996 source

  • May combine two claims.

    Interpretationcitation

    Infants learn distributional frequency patterns in ambient speech from both short laboratory exposures and months of natural exposure.

    “Taken as a whole, these studies indicate infants pick up the distributional frequency patterns in ambient speech, whether they experience them during short-term laboratory experiments, or over months in natural environments, and can learn from them.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationcitation

    Neural commitment has bi-directional effects: it increases learning for patterns compatible with the learned phonetic structure and decreases perception of nonnative patterns that do not match it.

    “These data led to a theoretical argument that an implicit learning process commits the brain’s neural circuitry to the properties of native-language speech, and that neural commitment has bi-directional effects – it increases learning for patterns (such as words) that are compatible with the learned phonetic structure, while decreasing perception of nonnative patterns that do not match the learned”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    In a study with 6- and 8-month-old infants exposed to a /da/-/ta/ continuum, the bimodal group discriminated the /da/ and /ta/ sounds after familiarization, whereas the unimodal group did not.

    “After familiarization, infants in the bimodal group discriminated the /da/ and /ta/ sounds, whereas those in the unimodal group did not.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Maye et al., 2002 source

  • May combine two claims.

    Interpretationcitation

    Social interaction may activate brain mechanisms for self-other relationship and perception-action social understanding systems.

    “Social interaction may activate brain mechanisms that invoke a sense of relationship between the self and other, as well as social understanding systems that link perception and action (Hari and Kujala, 2009).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Hari and Kujala, 2009 source

  • Probably not a substantial claim: may not pass S1 (asserted). May combine two claims.

    Interpretationreasoning

    Tutor social cues such as eye gaze and pointing may help 9-month-old infants segment word-like units from ongoing speech, facilitating phonetic learning of sounds in those words.

    “When 9-month-old infants follow a tutor’s line of regard in our foreign-language learning situation, the tutor’s specific meaningful social cues, such as eye gaze and pointing to an object of reference, might help infants segment word-like units from ongoing speech, thus facilitating phonetic learning of the sounds contained in those words.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationown data

    A human being interacting with the infant during language exposure is critical for learning in complex natural language situations, though not required for simpler statistical-learning tasks.

    “Thus, the presence of a human being interacting with the infant during language exposure, while not required for simpler statistical-learning tasks (Maye et al., 2002; Saffran et al., 1996), is critical for learning in complex natural language-learning situations”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Maye et al., 2002 source
    • cites Saffran et al., 1996 source
    • cites Kuhl et al., 2003 source
    • Rests on an assumption: By 9 months, the initial universal pattern of infant perception has changed to a more language-specific one.
    • Rests on an assumption: The Mandarin phonetic contrast used in the test does not occur in English.

  • May combine two claims.

    Interpretationreasoning

    Later laboratory studies suggest limits on statistical learning and indicate that social brain systems are integrally involved and may be necessary for natural language learning.

    “Laboratory studies testing infant phonetic and word learning from exposure to a complex natural language suggest limits on statistical learning, and provide new information suggesting that social brain systems are integrally involved, and, in fact, may be necessary to explain natural language learning.”
    Quote in the paperSubstantial claim

  • Classified as probably not a substantial claim.

    Premisecitation

    Attention and arousal affect learning in many domains.

    “Attention and arousal affect learning in a wide variety of domains (Posner, 2004), and could impact infant learning during exposure to a new language.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Posner, 2004

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Bilingual adults show enhanced executive control skills, and this extends to young school-aged bilingual children.

    “Bilingual adult speakers show enhanced executive control skills (Bialystok, 1999, 2001; Bialystok and Hakuta, 1994; Wang et al., 2009), a finding that has been extended to young school-aged bilingual children (Carlson and Meltzoff, 2008).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Bialystok, 1999, 2001

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Bialystok and Hakuta, 1994

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Wang et al., 2009 source

  • May combine two claims.

    Premisecitation

    During live exposure, tutors focused their gaze on pictures or toys while speaking, and infants tended to follow the speaker's gaze.

    “During live exposure, tutors focused their visual gaze on pictures in the books or on the toys as they spoke, and the infants’ gaze tended to follow the speaker’s gaze, as previously observed in social learning studies (Baldwin, 1995; Brooks and Meltzoff, 2002).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Baldwin, 1995

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Brooks and Meltzoff, 2002 source

  • May combine two claims.

    Interpretationcitation

    Spanish language exposure effects extend to speech production, providing evidence of early sensory-motor coupling in speech.

    “The effects of Spanish language exposure extend to speech production, and provide evidence of an early coupling of sensory-motor learning in speech.”
    Quote in the paperSubstantial claim

  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    Gating may operate by increasing attention or arousal, information, a sense of relationship, and/or activation of brain mechanisms linking perception and action.

    “Gating could operate by increasing: (1) attention and/or arousal, (2) information, (3) a sense of relationship, and/or (4) activation of brain mechanisms linking perception and action.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    Referential information is present in live and televised conditions, harder to pick up via television, and absent in audio-only presentations.

    “Referential information is present in both the live and televised conditions, but it is more difficult to pick up via television, and is totally absent during audio-only presentations.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    White-crowned sparrows reject audiotaped alien songs but learn them when a live tutor sings them.

    “White-crowned sparrows, which reject the audiotaped songs of alien species, learn the same alien songs when a live tutor sings them (Baptista and Petrinovich, 1986).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Baptista and Petrinovich, 1986 source

  • May combine two claims.

    Interpretationown data

    New data show an extensive interface between cognition and language and indicate that whether multiple languages are experienced in infancy affects cognitive brain systems.

    “As reviewed, new data show the extensive interface between cognition and language and indicate that whether or not multiple languages are experienced in infancy affects cognitive brain systems.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Newborns showed no motor speech area activation for any signals while auditory areas responded robustly, suggesting perception-action linkages for speech may develop by 3 months.

    “Newborns tested by Imada et al. (2006) showed no activation in motor speech areas for any signals, whereas auditory areas responded robustly to all signals, suggesting the possibility that perception-action linkages for speech develop by 3 months of age as infants begin to produce vowel-like sounds.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Imada et al., 2006 source

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationcitation

    If social factors gate computational learning, infants would be protected from meaningless calculations, with learning restricted to signals from live humans rather than other sources.

    “If social factors “gate” computational learning, as proposed, infants would be protected from meaningless calculations – learning would be restricted to signals that derive from live humans rather than other sources (Doupe and Kuhl, 2008; Evans and Marler, 1995; Marler, 1991).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Doupe and Kuhl, 2008

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Evans and Marler, 1995

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Marler, 1991

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Theta power increases with memory load in adults in verbal or nonverbal tasks and in 8-month-old infants in working memory tasks.

    “Power in the theta band increases with memory load in adults tested in either verbal or nonverbal tasks (Gevins et al., 1997; Krause et al., 2000) and in 8-month-old infants tested in working memory tasks (Bell and Wolfe, 2007).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Gevins et al., 1997 source
    • cites Krause et al., 2000 source
    • cites Bell and Wolfe, 2007 source

  • May combine two claims.

    Premisecitation

    Male zebra finches vary songs across social contexts; songs to females differ from isolation songs, and females prefer directed songs.

    “More recent data indicate that male zebra finches vary their songs across social contexts; songs produced when singing to females vary from those produced in isolation, and females prefer these ‘directed’ songs (Wooley and Doupe, 2008).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Wooley and Doupe, 2008

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationcitation

    Social interaction appears necessary for language learning in infants, and an individual infant's social behavior is linked to ability to learn new language material.

    “Social interaction appears to be necessary for language learning in infants (Kuhl et al., 2003), and an individual infant’s social behavior is linked to their ability to learn new language material (Conboy and Kuhl, in press).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Kuhl et al., 2003 source
    • cites Conboy and Kuhl, in press

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Language evolved to address a need for social communication, and evolution may have forged a link between language and the social brain in humans.

    “Language evolved to address a need for social communication and evolution may have forged a link between language and the social brain in humans (Adolphs, 2003; Dunbar, 1998; Kuhl, 2007; Pulvermuller, 2005).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Adolphs, 2003 source
    • cites Dunbar, 1998 source
    • cites Kuhl, 2007 source

  • May combine two claims.

    Premisecitation

    Recent ERP studies indicate infants' brain responses to exaggerated motherese patterns elicit enhanced N250 and increased neural synchronization at frontal-central-parietal sites.

    “Recent ERP studies indicate that infants’ brain responses to the exaggerated patterns of motherese elicit an enhanced N250 as well as increased neural synchronization at frontal-central-parietal sites (Zhang, Koerner, Miller, Grice-Patil, Svec, Tusler and Carney, in press).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Zhang, Koerner, Miller, Grice-Patil, Svec, Tusler and Carney, in press

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisenone given

    Brain oscillations in various frequency bands are associated with cognitive abilities.

    “Brain oscillations in various frequency bands have been associated with cognitive abilities.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning

    Previous data and theorizing had not tied early phonetic learning to social factors; doing so suggests a more fundamental connection between social motivation and language learning mechanisms.

    “The idea that social interaction is integral to language learning has been raised previously for word learning; however, previous data and theorizing have not tied early phonetic learning to social factors. Doing so suggests a more fundamental connection between the motivation to learn socially and the mechanisms that enable language learning.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Children with ASD prefer non-speech over speech when given a choice, and this preference correlates with ERP responses to speech and severity of autistic symptoms.

    “It is also noteworthy that children with Autism Spectrum Disorder (ASD) prefer to listen to non-speech rather than speech, when given a choice, and this preference is strongly correlated with the children’s ERP brain responses to speech, as well as with the severity of their autistic symptoms (Kuhl et al., 2005b).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Kuhl et al., 2005b

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

54 of 54

  • The paper relies on this without support.

    Greater negativity of the mismatch negativity response reflects greater speech discrimination.

    “As shown in Figure 4, the ERP measure at 7.5 months of age (Fig 4A) provided an MMN measure of speech discrimination for both native and nonnative contrasts; greater negativity of the MMN reflects greater discrimination (Fig 4B).”

  • The paper relies on this without support.

    Spoken language lacks reliable markers for word boundaries in typical phrases.

    “Unlike written language, spoken language has no reliable markers to indicate word boundaries in typical phrases.”

  • The paper relies on this without support.

    By 9 months, the initial universal pattern of infant perception has changed to a more language-specific one.

    “At 9 months of age, the age at which the initial universal pattern of infant perception has changed to one that is more language-specific, infants were exposed to a foreign language for the first time (Kuhl et al., 2003).”

  • The paper relies on this without support.

    The Mandarin phonetic contrast used in the test does not occur in English.

    “all were tested with a Mandarin phonetic contrast that does not occur in English.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • This window of development could correspond to early critical periods when brain development is particularly sensitive to experience and when brain plasticity, involving sensory systems but also motor functions and cognition, is possible (147).

    “this window of development could correspond to early critical periods when brain development is particularly sensitive to experience and when brain plasticity, involving sensory systems but also motor functions and cognition, is possible (147).”

    From Gene × Environment Interactions in Autism Spectrum Disorders: Role of Epigenetic Mechanisms (2014) · cites this paper as [147]

  • During early life, key periods of high brain plasticity involve sensory systems, but also motor functions and cognition.

    “During early life, these key periods of high brain plasticity involve sensory systems, but also motor functions and cognition 10 .”

    From Progress toward treatments for synaptic defects in autism (2013) · cites this paper as [10]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Figure 7 is attributed to two different studies

    Minor

    One passage identifies Figure 7 with an MEG study of speech responses at several infant ages; another identifies it with results on social engagement during Spanish-language exposure.

  • The same learning curve is assigned two figure numbers

    Minor

    The discussion introduces the age-of-acquisition graph as Figure 1, then refers to the learning curve in the next paragraph as Figure 2.

  • Figure 7 is assigned to different results

    Minor

    Figure 7 is cited for the relationship between infants' social engagement and Spanish learning, and again for a separate MEG study of responses to speech.

3 of 3

Cites

Flagged first, then by citations

15 of the 172 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Abramson, 1970, Discriminability along the voicing continuum: cross-language tests, Proc. Int. Congr. Phon. Sci., 6, 569
  2. Cardillo, G.C. (2010). Predicting the predictors: Individual differences in longitudinal relationships between infant phoneme perception, toddler vocabulary, and preschooler language and phonological awareness. Doctoral Dissertation, University of Washington.

Cited by

Sorted by citations

Related

Authors
Kuhl, P. K.
Affiliations
University of Washington (US)
Corresponding author
Kuhl, Patricia K.
Venue
Neuron
Publisher
Elsevier BV
Published
2010-09
Volume
67
Issue
5
Pages
713-727
ISSN
0896-6273 (ISSN-L)
DOI
10.1016/j.neuron.2010.08.038
PMC
PMC2947444
OpenAlex
W2155721440
Cited by
798
References
172
Citations by year
2026: 50 · 2025: 70 · 2024: 57 · 2023: 59 · 2022: 71 · 2021: 57 · 2020: 60 · 2019: 45 · 2018: 45 · 2017: 53 · 2016: 50 · 2015: 46 · 2014: 36 · 2013: 37 · 2012: 27
FWCI
26.03
Type
journal article
Language
en
Open access
Licence
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
Topics
  • Social Sciences › Psychology › Developmental and Educational Psychology › Language Development and Disorders
  • Social Sciences › Psychology › Developmental and Educational Psychology › Child and Animal Learning Development
  • Health Sciences › Health Professions › Pharmacy › Infant Health and Development
Keywords
early language acquisition, phonetic processing, language development, social learning
MeSH terms
Brain, Cognition, Computer Simulation, Critical Period, Psychological, Evoked Potentials

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read under definition version 3 (extract-v3) on 2026-09-28.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-09-28.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

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