Giang Pham

A Longitudinal Study of Lexical Development in Children Learning Vietnamese and English

This longitudinal study modeled lexical development among children who spoke Vietnamese as a first language (L1) and English as a second language (L2). Participants (n = 33, initial mean age of 7.3 years) completed a total of eight tasks (four in each language) that measured vocabulary knowledge and lexical processing at four yearly time points. Multivariate hierarchical linear modeling was used to calculate L1 and L2 trajectories within the same model for each task. Main findings included (a) positive growth in each language, (b) greater gains in English resulting in shifts toward L2 dominance, and (c) different patterns for receptive and expressive domains. Timing of shifts to L2 dominance underscored L1 skills that are resilient and vulnerable to increases in L2 proficiency.

Lexical profiles of bilingual children with primary language impairment

This study used lexical tasks to examine associations between languages, tasks, and age in bilingual children with primary language impairment. Participants (n = 41, mean age 8;8 years) lived in the United States, spoke primarily Spanish (L1) at home and English (L2) at school, and were identified with moderate to severe impairments in both languages. A total of eight tasks (four in each language) measured breadth of vocabulary knowledge (receptive and expressive vocabulary) and aspects of lexical processing (rapid automatic naming and nonword repetition). Correlational analyses revealed older children outperformed younger children on lexical tasks in L2 but not L1, as well as relative L2 dominance for most individuals and tasks. Positive associations were found between languages on processing-based tasks but not vocabulary measures. Findings were consistent with literature on typical bilingual learners, albeit with a notable increased risk of plateau in L1 growth. Results are interpreted within a Dynamic Systems framework.

Bilingual children with primary language impairment: 3 months after treatment

BACKGROUND Evidence on the treatment effectiveness for bilingual children with primary language impairment (PLI) is needed to advance both theory and clinical practice. Of key interest is whether treatment effects are maintained following the completion of short-term intense treatments. AIMS To investigate change in select language and cognitive skills in Spanish-English bilingual children with PLI 3 months after children have completed one of three experimental treatment conditions. There are two main study aims. First, to determine if skills in Spanish, English and cognitive processing decline, improve or are maintained after treatment has been completed. Second, to determine if differential rates of change are a function of the type of treatment children received. METHODS & PROCEDURES Participants were 48 children, aged 5:6-11:3, who spoke Spanish and English and were diagnosed with moderate to severe PLI. Participants received 6 weeks of treatment focused on English only (EO), bilingual skills in Spanish and English (BI) or nonlinguistic cognitive processing (NCP). Treatment effects reported in a previous study were determined by comparing pre- and post-treatment performance on a variety of language and cognitive measures. Here we re-administered each measure 3 months after completion of the experimental treatments. Hierarchical linear models were calculated for each measure using pre-, post- and follow-up testing scores to estimate change trajectories and compare outcomes between treatment conditions. OUTCOMES & RESULTS Participants in all three treatment conditions either maintained skills or showed improvement even after treatment was discontinued for 3 months. Main findings included (1) comparable, positive rates of change on all English language outcomes for EO and BI conditions; (2) maintenance of Spanish language skills, and (3) modest improvements in NCP following the discontinuation of treatment. CONCLUSIONS & IMPLICATIONS This study is the first to examine longer-term treatment effects for bilingual school-age children with PLI. Differences in rates of change between languages and between treatment conditions are discussed in terms of social and cognitive processes that impact childrens language systems. The main findings have at least two implications for clinical practice: (1) therapy that emphasizes focused practice in language and cognitive processing skills may promote gains in childrens language learning abilities; and (2) bilingual treatment does not detract from outcomes in English, the language of the majority community for study participants.

Synthesizing Information From Language Samples and Standardized Tests in School-Age Bilingual Assessment

Purpose Although language samples and standardized tests are regularly used in assessment, few studies provide clinical guidance on how to synthesize information from these testing tools. This study extends previous work on the relations between tests and language samples to a new population-school-age bilingual speakers with primary language impairment-and considers the clinical implications for bilingual assessment. Method Fifty-one bilingual children with primary language impairment completed narrative language samples and standardized language tests in English and Spanish. Children were separated into younger (ages 5;6 [years;months]-8;11) and older (ages 9;0-11;2) groups. Analysis included correlations with age and partial correlations between language sample measures and test scores in each language. Results Within the younger group, positive correlations with large effect sizes indicated convergence between test scores and microstructural language sample measures in both Spanish and English. There were minimal correlations in the older group for either language. Age related to English but not Spanish measures. Conclusions Tests and language samples complement each other in assessment. Wordless picture-book narratives may be more appropriate for ages 5-8 than for older children. We discuss clinical implications, including a case example of a bilingual child with primary language impairment, to illustrate how to synthesize information from these tools in assessment.

Pathways for learning two languages: lexical and grammatical associations within and across languages in sequential bilingual children

This study examines the strength and direction of lexical-grammatical associations within and between first and second languages (L1 and L2) in a longitudinal sample of sequential bilinguals. Thirty-three children who spoke Vietnamese (L1) and English (L2) completed picture-naming and story-telling tasks in each language at four yearly intervals. Hierarchical linear modeling across Years 1-4 revealed bidirectional within-language associations and a unidirectional cross-language association from the L1 to L2. Results suggest a conditional relationship between languages in which the L1 supports L2 growth, but not vice versa. Findings contribute to defining pathways for L1 and L2 learning across domains and languages.

A longitudinal analysis of sentence interpretation in bilingual children

This longitudinal study used sentence interpretation tasks to consider growth in language processing among school-aged children learning Vietnamese and English. Thirty-two children participated yearly over three time points. Children were asked to identify the agent of sentences that manipulated linguistic cues relevant to Vietnamese (animacy) and English (word order). Hierarchical linear modeling was used to examine change in cue use over time as well as the relation between cue use and proficiency in each language. Findings include exclusive reliance on word order by the end point, nearly identical group-level cue-use patterns across languages with individual variation, and positive relationships between language proficiency and cue use. Findings are discussed within the unified competition model (MacWhinney, 2004) and the literature on sequential bilingualism.

Nonword repetition stimuli for Vietnamese-speaking children

Nonword repetition (NWR) has been a widely used measure of language-learning ability in children with and without language disorders. Although NWR tasks have been created for a variety of languages, minimal attention has been given to Asian tonal languages. This study introduces a new set of NWR stimuli for Vietnamese. The stimuli include 20 items ranging in length from one to four syllables. The items consist of dialect-neutral phonemes in consonant–vowel (CV) and CVC sequences that follow the phonotactic constraints of the language. They were rated high on wordlikeness and have comparable position segments and biphone probabilities across stimulus lengths. We validated the stimuli with a sample of 59 typically developing Vietnamese–English bilingual children, ages 5 to 8. The stimuli exhibited the expected age and length effects commonly found in NWR tasks: Older children performed better on the task than younger children, and longer items were more difficult to repeat than shorter items. We also compared different scoring systems in order to examine the individual phoneme types (consonants, vowels, and tones) and composite scores (proportions of phonemes correct, with and without tone). The study demonstrates careful construction and validation of the stimuli, and future directions are discussed.

Internal and External Factors That Support Children's Minority First Language and English

Purpose Sequential bilingual children in the United States often speak 2 languages that have different social statuses (minority-majority) and separate contexts for learning (home-school). Thus, distinct factors may support the development of each language. This study examined which child internal and external factors were related to vocabulary skills in a minority language versus English. Method Participants included 69 children, aged 5-8 years, who lived in Southern California, spoke Vietnamese as the home language, and received school instruction in English. All participants had at least 1 foreign-born parent, and most mothers reported limited English proficiency. Parents completed a telephone survey, and children completed measures of receptive and expressive vocabulary in each language. Using correlations and stepwise regression, we examined predictors of vocabulary skills in each language that were internal to the child (age, gender, analytical reasoning, phonological memory) or that pertained to the surrounding environment (cumulative exposure, quantity and quality of input/output). Results Vietnamese vocabulary outcomes were related to multiple external factors, of which input and enrichment activities were the best predictors. In contrast, English vocabulary outcomes were related to internal factors, of which age and phonological memory were the best predictors. Parental use of Vietnamese contributed to childrens Vietnamese vocabulary outcomes but was not related to childrens English vocabulary outcomes. Conclusions Vietnamese exposure does not hinder English development. Children from immigrant families are learning English with or without familial support. Rich and frequent exposure and opportunities for practice are essential for the continued development of a minority first language.

Learning Words and Definitions in Two Languages: What Promotes Cross-Language Transfer?: Definitions Across Languages

This study used a brief vocabulary training paradigm to examine two factors for cross-language transfer: how similar the first language (L1) is to the second language (L2) and L1-L2 proficiency levels. Fifty-four sequential bilingual children (aged 6-8) with similar L2 English proficiency levels were assigned to three equal groups: a Vietnamese-English group with low L1 proficiency, a Spanish-English group with low L1 proficiency, and a Spanish-English group with high L1 proficiency. Individual training consisted of two mediated learning experiences conducted in the L1 targeting eight vocabulary items using narrative-based activities. Four of eight target words were cognates between Spanish and English. Pre- and posttesting measured definition quality in the L1 and L2. All groups showed improvement in the L1 following training, but only the Spanish-English group with high L1 proficiency improved in L2 English, revealing a degree of spontaneous cross-language transfer among children with high L1-L2 proficiency.

Connections Among Language Knowledge, Language Processing, and Nonlinguistic Cognitive Processing in Bilingual Children with Language Impairment

Background and rationale. Children with Primary (or Specific) Language Impairment (PLI) show subtle weaknesses in cognitive areas such as processing speed and working memory; such weaknesses appear on both nonlinguistic tasks such as shape detection and on language processing tasks such as nonword repetition and rapid automatic naming. The relationship between processing weaknesses and the impaired linguistic performance that characterizes children with PLI is not yet clear. Bilingual children with PLI offer additional insight into relations across domains (cognitive and linguistic) in two different languages while holding within-learner factors constant. Cross-linguistic relations in this population can also provide insight into language learning mechanisms.