The role of lexical and prosodic characteristics of mothers' child-directed speech for the early vocabulary development of Italian children with cochlear implants.

BACKGROUND: Variability in the vocabulary outcomes of children with cochlear implants (CIs) is partially explained by child-directed speech (CDS) characteristics. Yet, relatively little is known about whether and how mothers adapt their lexical and prosodic characteristics to the child's hearing status (before and after implantation, and compared with groups with normal hearing (NH)) and how important they are in affecting vocabulary development in the first 12 months of hearing experience. AIMS: To investigate whether mothers of children with CIs produce CDS with similar lexical and prosodic characteristics compared with mothers of age-matched children with NH, and whether they modify these characteristics after implantation. In addition, to investigate whether mothers' CDS characteristics predict children's early vocabulary skills before and after implantation. METHODS & PROCEDURES: A total of 34 dyads (17 with NH, 17 with children with CIs; ages = 9-32 months), all acquiring Italian, were involved in the study. Mothers' and children's lexical quantity (tokens) and variety (types), mothers' prosodic characteristics (pitch range and variability), and children's vocabulary skills were assessed at two time points, corresponding to before and 1 year post-CI activation for children with CIs. Children's vocabulary skills were assessed using parent reports; lexical and prosodic characteristics were observed in semi-structured mother-child interactions. OUTCOMES & RESULTS: Results showed that mothers of children with CIs produced speech with similar lexical quantity but lower lexical variety, and with increased pitch range and variability, than mothers of children with NH. Mothers generally increased their lexical quantity and variety and their pitch range between sessions. Children with CIs showed reduced expressive vocabulary and lower lexical quantity and variety than their peers 12 months post-CI activation. Mothers' prosodic characteristics did not explain variance in children's vocabulary skills; their lexical characteristics predicted children's early vocabulary and lexical outcomes, especially in the NH group, but were not related to later language development. CONCLUSIONS & IMPLICATIONS: Our findings confirm previous studies on other languages and support the idea that the lexical characteristics of mothers' CDS have a positive effect on children's early measures of vocabulary development across hearing groups, whereas prosodic cues play a minor role. Greater input quantity and quality may assist children in the building of basic language model representations, whereas pitch cues may mainly serve attentional and emotional processes. Results emphasize the need for additional longitudinal studies investigating the input received from other figures surrounding the child and its role for children's language development. WHAT THIS PAPER ADDS: What is already known on the subject Mothers' CDS is thought to facilitate and support language acquisition in children with various language developmental trajectories, including children with CIs. Because children with CIs are at risk for language delays and have acoustic processing limitations, their mothers may have to produce a lexically simpler but prosodically richer input, compared to mothers of children with NH. Yet, the literature reports mixed findings and no study to our knowledge has concurrently addressed the role of mothers' lexical and prosodic characteristics for children's vocabulary development before implantation and in the first 12 months of hearing experience. What this study adds to the existing knowledge The study shows that mothers of children with CIs produce input of similar quantity but reduced variety, and with heightened pitch characteristics, compared to mothers of children with NH. There was also a general increase in mothers' lexical quantity and variety, and in their pitch range, between sessions. Only their lexical characteristics predicted children's early vocabulary skills. Their lexical variety predicted children's expressive vocabulary and lexical variety only in the NH group. What are the practical and clinical implications of this work? These findings expand our knowledge about the effects of maternal input and may contribute to the improvement of early family-centred intervention programmes for supporting language development in children with CIs.

The Language ENvironment Analysis system (LENA): A validation study with Italian-learning children.

This study is a validation of the LENA system for the Italian language. In Study 1, to test LENA's accuracy, seventy-two 10-minute samples extracted from daylong LENA recordings were manually transcribed for 12 children longitudinally observed at 1;0 and 2;0. We found strong correlations between LENA and human estimates in the number of Adult Word Count (AWC) and Child Vocalisations Count (CVC) and a weak correlation between LENA and human estimates in Conversational Turns Count (CTC). In Study 2, to test the concurrent validity, direct and indirect language measures were considered on a sample of 54 recordings (19 children). Correlational analyses showed that LENA's CVC and CTC were significantly related to the children's vocal production, a parent report measure of prelexical vocalizations and the vocal reactivity scores. These results confirm that the automatic analyses performed by the LENA device are reliable and powerful for studying language development in Italian-speaking infants.

Vocabulary production in toddlers from low-income immigrant families: evidence from children exposed to Romanian-Italian and Nigerian English-Italian.

The relationship between first and second language in early vocabulary acquisition in bilingual children is still debated in the literature. This study compared the expressive vocabulary of 39 equivalently low-SES two-year-old bilingual children from immigrant families with different heritage languages (Romanian vs. Nigerian English) and the same majority language (Italian). Vocabulary size, vocabulary composition and translation equivalents (TEs) were assessed using the Italian/L1 versions of the CDI. Higher vocabulary in Italian than in the heritage language emerged in both groups. Moreover, Romanian-Italian-speaking children produced higher proportions of TEs than Nigerian English-Italian-speaking children, suggesting that L1-L2 phonological similarity facilitates the acquisition of cross-linguistic synonyms.

Lexical access and competition in bilingual children: The role of proficiency and the lexical similarity of the two languages.

Using a picture-auditory word recognition task, we examined how early child bilinguals access their languages and how the languages affect one another. Accuracy and response times in "false friends" (i.e., words with similar form but unrelated meanings) and semantically related words were compared with control conditions within and across languages and grades. Study 1 tested the performance of school-age children with balanced versus unbalanced knowledge of first-language (L1) Italian and second-language (L2) German. Study 2 compared unbalanced bilingual children with L1 Italian and L2 French or German to investigate the effect of lexical similarity in the children's languages. Children were found to activate both languages on receiving an auditory stimulus; performance in each language was affected by proficiency in the other language, degree of between-language similarity, and length of experience with each language. The BLINCS (Bilingual Language Interactive Network for Comprehension of Speech) model was invoked as a plausible framework for conceptualizing the nature of bilingual phonolexical representation and its effect on word recognition.

Impacts of a shared book-reading intervention for Italian-speaking children with developmental language disorder.

BACKGROUND: The regular practice of shared book reading (SBR) at home may play a key role in fostering the linguistic development of children with developmental language disorder (DLD). However, more evidence is needed of the benefits of home-based SBR interventions on the parents' conversational strategies and on the communicative and linguistic production of children with DLD. AIMS: To examine the impacts of a parent-based SBR intervention on the parent's use of conversational strategies, and on the engagement, conversational participation and linguistic production of Italian-speaking children with DLD. The mothers trained in the use of SBR strategies were expected to increase their use of these strategies. The children were expected to show gains in their level of engagement and conversational participation during SBR; in turn, moderate increments of the indices of language production were expected. METHODS & PROCEDURES: Thirty-two preschool children with DLD participated in the study; all were receiving speech language therapy. Using a non-randomized pre-post-test control trial, 20 mother-child dyads implemented an 8-week SBR programme (the SBR intervention group), while 12 dyads acted as a comparison group. Based on the 'dialogic reading' method, eight verbal and non-verbal SBR strategies were employed during individual and small-group parent training sessions. Speech-language therapists were involved in the individual parent training sessions to provide suggestions focused on the specific characteristics of each mother-child dyad. Measures of parents' intervention strategies, children's engagement, conversational participation and oral language were included. OUTCOMES & RESULTS: At post-test, mothers in the SBR intervention group used three of the eight SBR strategies-Shared Book Handling, Captivating Talking, and Utterances with a familiar topic-significantly more than the comparison group. Children whose mothers implemented the intervention showed significant gains in terms of time spent in engagement and amount of verbal production during shared reading. No effects were found for the children's communicative initiatives and answers, or for indices of language complexity and diversity. CONCLUSIONS & IMPLICATIONS: The present parent-based SBR intervention for Italian-speaking preschoolers with DLD showed effects, albeit modest, on both maternal and child communicative behaviours. The results suggest that extralinguistic strategies may be implemented successfully by parents and may be effective in enhancing children's engagement and language production in the short term. Further investigations are needed that provide a longer intervention period and examine the joint impact of therapist- and parent-based intervention for children with DLD.

Vocal production and novel word learning in the first year.

Previous studies have demonstrated an effect of early vocal production on infants' speech processing and later vocabulary. This study focuses on the relationship between vocal production and new word learning. Thirty monolingual Italian-learning infants were recorded at about 11 months, to establish the extent of their consonant production. In parallel, the infants were trained on novel word-object pairs, two consisting of early learned consonants (ELC), two consisting of late learned consonants (LLC). Word learning was assessed through Preferential Looking. The results suggest that vocal production supports word learning: Only children with higher, consistent consonant production attended more to the trained ELC images.

Spontaneous language production of Italian children with cochlear implants and their mothers in two interactive contexts.

BACKGROUND: In recent years many studies have shown that the use of cochlear implants (CIs) improves children's skills in processing the auditory signal and, consequently, the development of both language comprehension and production. Nevertheless, many authors have also reported that the development of language skills in children with CIs is variable and influenced by individual factors (e.g., age at CI activation) and contextual aspects (e.g., maternal linguistic input). AIMS: To assess the characteristics of the spontaneous language production of Italian children with CIs, their mothers' input and the relationship between the two during shared book reading and semi-structured play. METHODS & PROCEDURES: Twenty preschool children with CIs and 40 typically developing children, 20 matched for chronological age (CATD group) and 20 matched for hearing age (HATD group), were observed during shared book reading and semi-structured play with their mothers. Samples of spontaneous language were transcribed and analysed for each participant. The numbers of types, tokens, mean length of utterance (MLU) and grammatical categories were considered, and the familiarity of each mother's word was calculated. OUTCOMES & RESULTS: The children with CIs produced shorter utterances than the children in the CATD group. Their mothers produced language with lower levels of lexical variability and grammatical complexity, and higher proportions of verbs with higher familiarity than did the mothers in the other groups during shared book reading. The children's language was more strongly related to that of their mothers in the CI group than in the other groups, and it was associated with the age at CI activation. CONCLUSIONS & IMPLICATIONS: The findings suggest that the language of children with CIs is related both to their mothers' input and to age at CI activation. They might prompt suggestions for intervention programs focused on shared-book reading.

The role of geminates in infants' early word production and word-form recognition.

Infants learning languages with long consonants, or geminates, have been found to 'overselect' and 'overproduce' these consonants in early words and also to commonly omit the word-initial consonant. A production study with thirty Italian children recorded at 1;3 and 1;9 strongly confirmed both of these tendencies. To test the hypothesis that it is the salience of the medial geminate that detracts attention from the initial consonant we conducted three experiments with 11-month-old Italian infants. We first established baseline word-form recognition for untrained familiar trochaic disyllables and then tested for word-form recognition, separately for words with geminates and singletons, after changing the initial consonant to create nonwords from both familiar and rare forms. Familiar words with geminates were recognized despite the change, words with singletons were not. The findings indicate that a feature occurring later in the word affects initial consonant production and perception, which supports the whole-word phonology model.

Maternal input to children with specific language impairment during shared book reading: is mothers' language in tune with their children's production?

BACKGROUND: The literature on input addressed to children with specific language impairment (SLI) has shown contrasting results on the role that parents assume during conversational interactions. Some studies have shown that parents compensate for the child's linguistic limitations. In contrast, other studies have indicated that mothers are able to adjust their communication in response to their children's language characteristics. AIMS: To assess the 'closeness of fit' between maternal input and child language profiles in children with SLI during shared book reading. To achieve this aim, the individual linguistic features of a group of children with SLI and their mothers were compared with those of two typically developing (TD) groups and the 'distances' (i.e., the differences between the mother's and her child's linguistic indices) within each dyad were compared. METHOD & PROCEDURES: Three groups of children with their mothers participated in the study: 14 children with expressive SLI, 14 language age-matched TD children (LA-matched group), and 14 chronological age-matched TD children (CA-matched group). Each mother-child dyad was videotaped during two weekly sessions of shared book reading, at home. All sessions were entirely transcribed. For each session, the following indices were then considered: whole-word phonological indices, grammatical categories and lexical indices for types and tokens, and the distance between the mother's and the child's linguistic indices within individual dyads. OUTCOMES & RESULTS: Analysis of the differences between phonological, lexical and morphosyntactic characteristics of the mothers' and children's language indicated that both children with SLI and their mothers produced adjectives and adverbs with lower phonological complexity and with higher frequency of use compared with the CA-matched group, and nouns with lower frequency of use and higher age of acquisition compared with the LA-matched group. In addition, individual dyads within the SLI group displayed reduced distances between linguistic indices produced by the mother and child compared with dyads within the CA-matched group. CONCLUSIONS & IMPLICATIONS: On the whole these findings suggest that mothers of children with SLI are able to tune their language to their children's linguistic limitations. These findings may contribute to improving early intervention programmes with children with SLI by focusing on the mother-child interaction during shared book reading.

I-MovE. An intervention to promote movement at childcare centers: Benefits for motor cognitive and socio-emotional development.

The present contribution aimed to analyze the effects of a motor program intervention (i.e., I-MovE intervention) implemented indoors and outdoors at nursery school, on children's motor, socio-emotional, and cognitive skills. The study uses a non-randomized pre-post test design. Participants were children attending twenty nursery schools in the North of Italy. The intervention activities were adapted to age: Level 1 activities were addressed to children between 6 and 12 months, and Level 2 activities were addressed to children between 13 and 43 months. Within each level, one group of children developed the intervention indoors (IN-group; Level 1: n = 10; Level 2: n = 104) and another group developed the intervention outdoors (OUT-Group; Level 1: n = 12; Level 2: n = 66). Finally, one additional group was involved as the control group (CONT-Group; Level 1: n = 15; Level 2: n = 98). Children's motor, cognitive, and socio-emotional skills were assessed before and after the intervention by nursery school teachers. The main results showed that the motor intervention promoted children's motor skills development in both groups (i.e., groups implementing Levels 1 and 2 activities) and the cognitive and socio-emotional skills in the older group (i.e., group implementing Level 2 activities), especially the group that performed the intervention outdoors.

The use of a computer-based program focused on the syllabic method to support early literacy in children with cochlear implants.

BACKGROUND: Children with cochlear implants (CIs) often lag behind children with normal hearing (NH) in early literacy skills. Furthermore, the development of language skills associated with their emergent literacy skills seems to depend on good auditory access. Supporting language acquisition and early literacy in children with CIs may prevent difficulties in primary school. The use of technology may facilitate auditory and speech recovery in children with CIs, but evidence on computer-based early literacy programs is limited. OBJECTIVE: This study investigates (a) the effects of a computer-based program focusing on the syllabic method on the literacy skills of children with CIs (CIs group), comparing them with the literacy skills of a group of age-matched NH (normal hearing) peers (NHs group); (b) the associations between language and early literacy skills in the NHs group and between language, auditory and early literacy skills in the CIs group. METHOD: Nine prelingually deaf children with CIs (M = 61.11, SD = 6.90) with severe to profound sensorineural hearing loss and nine age-matched NH children participated in the program. Categories of Auditory Performance (CAP) as measures of children's auditory skills were collected. All participants were tested on phonological, morphosyntax (grammatical comprehension and repetition), and early literacy skills (syllable blending and segmentation, syllable and word reading) (T1). Next, all children participated in the computer-based program for 12 weeks. After the program was completed (T2), only early literacy tests were administered to the children. RESULTS: Although, on average, both groups obtained higher scores in all literacy tasks at T2, the CIs group scored lower than the NHs group. In the CIs group, at T2 we found significant improvements in syllable segmentation (p = 0.042) and word reading (p = 0.035). In the NHs group, at T2 we found significant improvements in syllable segmentation (p = 0.034), syllable blending (p = 0.022), syllable reading (p = 0.008), and word reading (p = 0.009). We also found significant associations in both groups between measures of morphosyntax at T1 and measures of early literacy at T2. In addition, for the CIs group, we found significant associations between children's auditory performance at T1 and measures of morphosyntax at T1 and early literacy at T2. CONCLUSION: a computer-based program focused on the syllabic method could support children with CIs in acquiring emergent literacy abilities. The auditory performance of children with CIs seems to influence their morphosyntax and later early literacy skills.

Narrative skills and language comprehension in preschool children with cochlear implants: A comparison with children with Developmental Language Disorder or typical development.

INTRODUCTION: The narrative skills of children with cochlear implants (CIs) are fragile, but the factors at play and whether these difficulties could be similar to those detected in language impairment are not clear. The present study aims to assess, at the microstructural level, narrative skills, comparing children with CIs with children with Developmental Language Disorder (DLD) or Typical Development (TD). Furthermore, the relationship between verbal (lexical and morphosyntactic) comprehension and narrative skills across groups is investigated. METHODS: The narratives of 19 children with CIs (Mage = 62.42 months, SD = 6.83), 13 children with DLD (Mage = 65.38 months, SD = 4.27), and 18 preschool children with TD (Mage = 63.67 months, SD = 4.31) were assessed in a standardized task. Articles, prepositions, pronouns, gender and number agreement, accuracy in the use of verbs, and number of arguments in each sentence were analysed. Lexical and morphosyntactic comprehension were also assessed. Performance was compared across groups using ANOVAs or Kruskal-Wallis tests. The role of lexical and morphosyntactic comprehension in predicting each morphological and syntactic element in the narrative task was examined using linear regressions. RESULTS: Data analysis showed that both children with CIs and DLD had fragilities in narration, both in the morphological and syntactic components. Although some differences between children with CIs and those with DLD emerged in descriptive analyses, these were not statistically significant. Regressions showed that morphosyntactic comprehension predicted the number of pronouns produced only in the TD group. CONCLUSIONS: The scarce differences between CI and DLD groups and the absence of an effect of morphosyntactic comprehension on pronoun production may be due to their low production of these elements in the narrative task and/or to a difficulty in managing pronouns in an expressive task regardless of their ability to comprehend them. Potential implications of these results are discussed.

Parents' child-directed communication and child language development: a longitudinal study with Italian toddlers.

The present study focuses on the characteristics of parental child-directed communication and its relationship with child language development. For this purpose, thirty-six toddlers (18 males and 18 females) and their parents were observed in a laboratory during triadic free play at ages 1 ; 3 and 1 ; 9. The characteristics of the maternal and paternal child-directed language (characteristics of communicative functions and lexicon as reported in psycholinguistic norms for Italian language) were coded during free play. Child language development was assessed during free play and at ages 2 ; 6 and 3 ; 0 using the Italian version of the MacArthur-Bates Communicative Development Inventory (2 ; 6) and the revised Peabody Picture Vocabulary Test (PPVT-R) (3 ; 0). Data analysis indicated differences between mothers and fathers in the quantitative characteristics of communicative functions and language, such as the mean length of utterances (MLU), and the number of tokens and types. Mothers also produced the more frequent nouns in the child lexicon. There emerged a relation between the characteristics of parental child-directed language and child language development.

Examining pragmatic language development in preschoolers with and without neurodevelopmental disorders: A cross-sectional study.

This cross-sectional study examined the relationship between gender, age, and pragmatic language development in n = 77 Italian preschool children (49-84 months) with and without neurodevelopmental disorders. The sample included 62 children without psychiatric history (n = 34 females, n = 27 males) and n = 15 children with psychiatric history (2 females, n = 13 males). Eight cases (n = 6 males, n = 2 females, 59-75 months) were matched for age and gender. The neurodevelopmental disorder group used the Targeted Observation of Pragmatics in Children's Conversations (TOPICC) tool. Pragmatic language skills were assessed with the Pragmatic Language Abilities (APL), Children's Communication Checklist-Version 2 (CCC-2), and TOPICC scales. Results showed no significant relationship between gender and pragmatic language development subscales, except for a marginally significant relationship with figurative metaphor scores. Age was positively correlated with verbal metaphor, metaphor, implied meaning, and overall pragmatic language skills, but not with figurative metaphor or situations scores. Paired samples t-tests and Wilcoxon tests compared matched groups, revealing significant differences between children with and without neurodevelopmental disorders on the TOPICC, APL, and CCC-2 tools. The findings highlight the importance of early identification and intervention for children with pragmatic language impairment (PLI) and the need for further research with larger samples.

Competing views on interventions for pragmatic language skills in persons with pragmatic language impairment: An umbrella review.

This umbrella review aimed to evaluate the effectiveness of pragmatic language interventions and existing competing views in improving pragmatic language skills in persons with pragmatic language impairment (PLI). A comprehensive search was conducted to identify qualitative and quantitative systematic reviews that included diagnostic criteria, features, development and course, risk and prognostic factors, differential diagnosis of PLI, and existing interventions, views, and arguments to improve the pragmatic language abilities/skills of persons with PLI. Syntheses were critically appraised by two independent reviewers using the JBI Critical Appraisal Checklist for Systematic Reviews and Research Syntheses. This umbrella review was registered with PROSPERO on 9th December 2022 under the registration number CRD42022378690. Out of 3,609 studies, 42 reviews were included in this umbrella review. The extracted findings were categorized based on theoretical intervention perspectives, which included behavioral, social-pragmatic, and cognitive-linguistic approaches. The studies revealed that pragmatic language interventions had a positive impact on improving pragmatic language skills in persons with PLI. However, competing views on pragmatic language interventions were also identified, suggesting the need for a more comprehensive approach that includes both behavioral and cognitive-linguistic components. In conclusion, cognitive-linguistic approach was the most documented intervention method, and suiting intervention methods to the complex nature of PLI is crucial. The documented intervention methods reflected competing views on the nature of PLI, highlighting the need for tailored interventions.

Infant looking preferences towards dynamic faces: A systematic review.

Although the pattern of visual attention towards the region of the eyes is now well-established for infants at an early stage of development, less is known about the extent to which the mouth attracts an infant's attention. Even less is known about the extent to which these specific looking behaviours towards different regions of the talking face (i.e., the eyes or the mouth) may impact on or account for aspects of language development. The aim of the present systematic review is to synthesize and analyse (i) which factors might determine different looking patterns in infants during audio-visual tasks using dynamic faces and (ii) how these patterns have been studied in relation to aspects of the baby's development. Four bibliographic databases were explored, and the records were selected following specified inclusion criteria. The search led to the identification of 19 papers (October 2021). Some studies have tried to clarify the role played by audio-visual support in speech perception and early production based on directly related factors such as the age or language background of the participants, while others have tested the child's competence in terms of linguistic or social skills. Several hypotheses have been advanced to explain the selective attention phenomenon. The results of the selected studies have led to different lines of interpretation. Some suggestions for future research are outlined.

Do motor skills impact on language development between 18 and 30 months of age?

Despite recent evidence on the relation between motor development and language development in infancy, this relation is still little explored in the late second and third year. This study investigated whether gross and/or fine motor skills affect language outcomes in this age range and whether any such effects narrow over time to specific language categories related to motor experience, such as spatial vocabulary. Thirty-six Italian monolingual toddlers (58% girls) participated, divided into two groups based on their age. They were assessed twice: the younger group at 18 (Time-1) and 24 months (Time-2); the older group at 24 (Time-1) and 30 months (Time-2). At Time-1 motor and language abilities were measured using the Griffiths Mental Development Scales. At Time-2, only language outcomes (three vocabularies: nouns, predicates, and spatial terms) were assessed, using the Picture Naming Game-PiNG. Hierarchical linear regressions show that motor skills affect language abilities also in the late second and third year, but the impact varies according to the type of motor skills (gross vs. fine) and children's age. At 18 months, controlling for linguistic abilities, a global score of gross motor skills predicted predicate production, and a specific gross-motor coordination skill: general dynamic coordination (GDC) predicted noun production at 24 months. At 24 months, controlling for linguistic abilities, GDC predicted predicate production, and a combination of fine- and gross-motor coordination skills (bilateral coordination and GDC) predicted spatial vocabulary comprehension at 30 months. Overall, results suggest that the relation between motor and language development is not simple or stable over time, but rather dynamic.

Characteristics of phonological development as a risk factor for language development in Italian-speaking pre-term children: A longitudinal study.

This study analysed the early linguistic development of Italian pre-term children. Samples of spontaneous pre-linguistic and verbal production were recorded at 12 and 18 months of age from two groups of children: 24 pre-term children and 15 full-term children. The Italian version of the MacArthur-Bates Questionnaire was administered at 24 months of age. Comparisons between these two groups reveal differences in many aspects of phonetic and phonological development, such as consonantal inventory at 12 and 18 months of age and syllabic babbling complexity at 18 months of age. Results evidenced that birth weight was related with phonological skills exhibited at 18 months of age, and these skills in turn are related with vocabulary size at 24 months of age. Data are discussed within a theoretical framework that hypothesizes that early phonetic abilities have long-lasting effects on the process of language acquisition.

Home Language Activities and Expressive Vocabulary of Toddlers from Low-SES Monolingual Families and Bilingual Immigrant Families.

Children from low-SES (socioeconomic status) and minority language immigrant families are at risk of vocabulary difficulties due to the less varied and complex language in the home environment. Children are less likely to be involved in home language activities (HLA) in interaction with adults in low-SES than in higher-SES families. However, few studies have investigated the HLA variability among low-SES, minority language bilingual immigrant families. This longitudinal study analyzes the frequency and duration of HLA and their predictive roles for expressive vocabulary acquisition in 70 equivalent low-SES monolingual and bilingual toddlers from minority contexts. HLA and vocabulary were assessed at 24 and 30 months in the majority language (Italian) and in total (majority+minority language) using parent and teacher reports. The frequency and duration of HLA in interaction with adults in total, but not in the majority language, at 24 months were similar for the two groups. These activities uniquely accounted for expressive vocabulary at 30 months, after accounting for total vocabulary at 24 months, in both groups. In conclusion, a minority-majority language context is not an additional risk factor for vocabulary acquisition if HLA is considered in interaction with adults in both languages. HLA are proximal environmental protective factors for vocabulary acquisition.

Do Acoustic Environment Characteristics Affect the Lexical Development of Children With Cochlear Implants? A Longitudinal Study Before and After Cochlear Implant Activation.

Purpose This study investigates the acoustic environment of children with cochlear implants (CIs) and the relationship between exposure to speech, in noise and in quiet, and the children's lexical production up to 1 year after CI activation, while controlling for the effect of early individual differences in receptive vocabulary growth. Method Eighteen children with CIs were observed at 3, 6, and 12 months after CI activation. Children's spontaneous word production during interaction with their mothers (types and tokens) and their expressive and receptive vocabulary size were considered. The characteristics of the acoustic environments in terms of acoustic scenes (speech in noise or in quiet, quiet, noise, music, and other) and of loudness ranges were assessed using data logging of the children's devices. Results Data analysis showed that both the number of tokens and the number of types produced 1 year after CI activation were affected by the children's exposure to speech in quiet with a loudness range between 40 and 69 dB. Expressive vocabulary size and types were affected by the receptive vocabulary knowledge that the children achieved over the first 3 months after CI activation. Conclusions Our data support the role of speech environment and individual differences in early comprehension on lexical production. The importance of exposure to speech with particular characteristics for the lexical development of children with CIs and the implications for clinical practice are discussed.