Monolingual and Bilingual Children With and Without Primary Language Impairment: Core Vocabulary Comparison

Seeing Into the Future: Adults' Accuracy Predicting the Vocabulary of Early Symbolic Communicators Who Use Augmentative and Alternative Communication

PURPOSE

Vocabulary access is important for individuals who use augmentative and alternative communication (AAC), especially for children in the early stages of language learning. This study sought to understand how accurate speech-language pathologists (SLPs), teachers, and parents are in predicting the vocabulary needed by early symbolic communicators who use AAC in three contexts.

METHOD

Ten groups, each with a child who used AAC as their primary mode of communication and who was classified as an early symbolic communicator and their parent, teacher, and SLP, participated. The parents, teachers, and SLPs predicted a vocabulary list of words children who use AAC needed to participate in a dinner, a math lesson, and a speech session using the blank page method and categorical inventories technique. Children were then recorded in 15-min videos participating in the three contexts. Words were recorded and compared to the words predicted.

RESULTS

There was large variability in the accuracy of percentage of words the children used that were predicted by the adults out of all the words the children used. The adults were significantly more accurate predicting the vocabulary for the math lesson than the dinner.

CONCLUSIONS

Parents, teachers, and SLPs predicted much of the vocabulary of early symbolic communicators who use AAC. Implications for early vocabulary selection and alternatives to predicting vocabulary are discussed.

Is there a 'universal' core? Using semantic primes to select vocabulary across languages in AAC

Core vocabulary lists and vocabulary inventories vary according to language. Lists from one language cannot and should not be assumed to be translatable, as words represent language-specific concepts and grammar. In this manuscript, we (a) present the results of a vocabulary overlap analysis between different published core vocabulary lists in English, Korean, Spanish, and Sepedi; (b) discuss the concept of universal semantic primes as a set of universal concepts that are posited to be language-independent; and (c) provide a list of common words shared across all four languages as exemplars of their semantic primes. The resulting common core words and their corresponding semantic primes can assist families and professionals in thinking about the initial steps in the development of AAC systems for their bilingual/multilingual clients.

Word usage as measured by parental checklists and language samples: trends, comparisons, and implications

Background

Although parental checklists are well-known for their potential in indexing young children's lexicon size, they can also be used to track children's acquisition of individual words. Word-level data can be used to identify the checklist words most and least commonly employed across groups of children. Like parent-completed vocabulary checklists, samples of spontaneous language use collected from multiple children can also generate measures of word commonality, concerned with the numbers of children producing individual words. To our knowledge, comparisons of word usage as determined by parental checklist and language sample data obtained in parallel from the same children have not been carried out. Also scarce in the empirical literature are item-level analyses of early bilingual lexicons that explore word usage across two emerging languages. The present study aimed to contribute toward bridging both gaps through the analysis of data generated by a bilingual Maltese-English adaptation of the vocabulary checklist of the MacArthur Communicative Development Inventories: Words and Sentences (CDI: WS) and spontaneous language samples for the same children. An additional objective was to derive implications for revising the current version of the vocabulary checklist, in preparation for its eventual standardization.

Materials and methods

For 44 Maltese children aged 12, 18, 24, and 30 months, the words reported by their main caregivers on the vocabulary checklist were identified, along with their respective semantic categories. For the same children, 20-min language samples obtained during free play with the caregiver were transcribed orthographically. Words identified through parental report and language sampling were analyzed for commonality, i.e., the number of children producing each word.

Results

Comparison of the word usage patterns obtained through both methods indicated differences in the words most commonly sampled and those most commonly reported, particularly in relation to grammatical categories. Notwithstanding these differences, positive and significant correlations emerged when considering all grammatical categories and languages across commonality levels.

Discussion

The commonality scores based on parental checklist data have implications for reconsidering the length and language balance of the Maltese-English adaptation of the CDI: WS vocabulary checklist. Sampled word usage patterns can contribute additional objectivity in updating the reporting instrument in preparation for its eventual standardization.

Frequency of word usage by Hebrew preschoolers: implications for AAC core vocabulary

This study's goal was to inform the selection of the most frequently used words to serve as a reference for core vocabulary selection for Hebrew-speaking children who require AAC. The paper describes the vocabulary used by 12 Hebrew-speaking preschool children with typical development in two different conditions: peer talk, and peer talk with adult mediation. Language samples were audio-recorded, transcribed, and analyzed using the CHILDES (Child Language Data Exchange System) tools to identify the most frequently used words. The top 200 lexemes (all variations of a single word) in the peer talk and adult-mediated peer talk conditions accounted for 87.15% (n = 5008 tokens) and 86.4% (n = 5331 tokens) of the total tokens produced in each language sample (n = 5746, n = 6168), respectively. A substantially overlapping vocabulary of 337 lexemes accounted for up to 87% (n = 10411) of the tokens produced in the composite list (n = 11914). The results indicate that a relatively small set of words represent a large proportion of the words used by the preschoolers across two different conditions. General versus language-specific implications for core vocabulary selection for children in need of AAC devices are discussed.

Core vocabulary for AAC practice from Mandarin Chinese-speaking Taiwanese without disabilities

The purpose of this study was to select a core vocabulary list obtained from Mandarin Chinese-speaking Taiwanese persons without disabilities. Mandarin Chinese is dominant and official language of Taiwan. A total of 28 participants, equally divided among seven age groups, were recruited for the study. In all, 112 samples across different communication contexts were collected. Results indicated that 100 core words selected had coverage of 66.7% of the entire composite sample. The proportion of function words versus content words in the top 100 core words was 11% and 89%, respectively. The core vocabulary was categorized into eight parts of speech, including nouns, pronouns, numbers, adverbs, determiners, prepositions, adjectives, and verbs. Implications, limitations, and further research are discussed.

Augmentative and alternative communication for Aboriginal Australians: Developing core vocabulary for Yolŋu speakers

Yolŋu, Aboriginal people from Arnhem Land, Australia are at risk of Machado-Joseph disease, with progressive loss of speech. Yolŋu are interested in developing augmentative and alternative communication (AAC) systems in their own languages. This research aimed to develop a culturally responsive process to explore and create a core vocabulary word list for Yolŋu adults living with the disease for inclusion in AAC system prototypes. A list of 243 Yolŋu words and morphemes was created. In this highly collaborative, mixed methods, participatory action research, Balanda (the Yolŋu word for non-Aboriginal people) and Yolŋu researchers conducted cycles of transcription and analysis of a language sample, with oral group discussions to identify which words to include, omit, or add, based on Yolŋu perceptions of the structure and use of their languages. A Yolŋu metaphor, Gulaka-buma ("Harvesting yams"), was identified by Yolŋu researchers to represent and share the research process and findings. Three key themes were identified that summarize the main cultural and linguistic considerations related to changes made to the core vocabulary. Study findings emphasized the role of language as an expression of culture and identity for Indigenous peoples and the importance of considering cultural and linguistic factors in selecting vocabulary for AAC systems.

Identifying the Core Vocabulary for Adults With Complex Communication Needs From the British National Corpus by Analyzing Grouped Frequency Distributions

Purpose This study is aimed to identify the high-frequency vocabulary (HFV), otherwise termed "core vocabulary" for adults with complex communication needs. Method Three major characteristics of the HFV-a relatively small number of different words (NDW), a relatively high word frequency, and a high word commonality across speakers-were examined so as not to lose any candidate words for the HFV. Specifically, instead of applying the traditionally used cutoff word frequency of 0.5‰, a grouped frequency distribution was used to examine the appropriate frequency ranges to determine the HFV candidates. To improve the representativeness of the HFV across ages, social backgrounds, conversation situations, and topics, 330,000 spoken words of 66 adults (29 men and 37 women; M _age = 45.47 years, SD = 16.07) were extracted from the British National Corpus database for analysis. Results A distinct pattern of NDW was observed from the frequency of 0.1‰ in the grouped frequency distribution. In total, 671 words were found to be candidates for the HFV, accounting for 90.94% of the total sample words. After the word commonality analysis indicated at least 80% commonality across speakers, 203 words were selected for the final HFV; accountability was calculated at 80.62%. Conclusions With the innovative word analysis approach, this study provided an HFV list that can be used for a wide range of conversation topics. This method provides a scientific and principled approach to identifying and organizing vocabulary for augmentative and alternative communication (AAC) intervention that does not exist in many AAC resources that promote "core vocabulary" with identifying the source for vocabulary selection.

Determining the core vocabulary used by Sepedi-speaking children during regular preschool activities

PURPOSE

In order to provide equitable communication intervention and support services to clients from diverse cultural and linguistic backgrounds, the development of language-specific resources for assessment and intervention is needed. The purpose of the study was to develop a core vocabulary list based on language samples from Sepedi-speaking children, in order to make it available as a resource to inform vocabulary selection for augmentative and alternative communication (AAC) systems for children in need of AAC from a Sepedi language background.

METHOD

The speech of six typically developing Sepedi-speaking children aged 5-6 years was recorded using small body-worn audio recording devices. Children were recorded during their regular pre-school day. The recordings were transcribed, coded and analysed.

RESULT

The composite transcript consisted of 17 579 words, of which 1023 were different words. The core vocabulary was determined by identifying all words that were used with a minimal frequency of 0.05%, and were used by at least half of the participants. The Sepedi core vocabulary consisted of 226 words that accounted for 88.1% of the composite sample.

CONCLUSION

The core vocabulary determined in this study represents a small pool of reusable linguistic elements that form the grammatical framework of the Sepedi language. As such, is a valuable resource that can be used to assist with vocabulary selection for children who require AAC and who come from a Sepedi language background.

An early Spanish vocabulary for children who use AAC: developmental and linguistic considerations

For children with complex communication needs in the early stages of language development, access to appropriate vocabulary provides a means for social interaction and participation, and the foundation for the acquisition of grammar and other language related skills. While numerous resources are available to support decision making for speakers of English, there is a pressing need to rapidly expand such resources for other languages. Spanish is the official language in 20 countries, and in other countries (e.g., United States) Spanish-speaking communities represent a substantial proportion of the population. The aim of this study was to produce a developmentally-relevant word list for use by Spanish-speaking children in the early stages of language development. The list was developed from an analysis of overlap between published and validated lists of words produced by young Spanish speaking children with typical development. The list includes a wide range of word classes and semantic categories and is proposed as a tool to assist professionals, families and software developers in the process of selecting an initial lexicon for children who require AAC and are learning Spanish. Implications of our findings for vocabulary selection and future research directions are discussed.

The core vocabulary of South African Afrikaans-speaking Grade R learners without disabilities

Background

Augmentative and alternative communication (AAC) can enable individuals with little or no functional speech to communicate functionally in a variety of communication contexts. AAC systems for individuals who are not (yet) fully literate often require that the vocabulary for the system be preselected. By including the most commonly- and most frequently-used words (core vocabulary) in an AAC system, access to novel utterance generation can arguably be facilitated. At present, no Afrikaans core vocabulary list based on children’s speech samples exists.

Objectives

This study aimed to identify the most frequently- and commonly-used words of South African Afrikaans-speaking Grade R learners without disabilities.

Method

Spontaneous speech samples were collected from 12 Afrikaans-speaking Grade R learners during regular preschool activities. Samples were transcribed and analysed to determine the number of different words used, the frequency with which each word was used, as well as the commonality of word use across the 12 participants.

Results

A total of 239 words met the criteria for inclusion in the core vocabulary (words used with a frequency of more than 0.05% in the sample, and used by at least half of the participants). These words accounted for 79.4% of words used in the entire speech sample.

Conclusion

The established core vocabulary consists of a relatively small set of words that was found to represent a large proportion of speech. AAC team members may consider including these words on Afrikaans AAC systems that are intended to give access to a measure of novel utterance generation.

Framework for Selecting Vocabulary for Preliterate Children Who Use Augmentative and Alternative Communication

Purpose Nearly 50% of school-based speech-language pathologists (SLPs) provide services to school-age children who use augmentative and alternative communication (AAC). However, many SLPs report having insufficient knowledge in the area of AAC implementation. The objective of this tutorial is to provide clinicians with a framework for supporting 1 area of AAC implementation: vocabulary selection for preliterate children who use AAC. Method This tutorial focuses on 4 variables that clinicians should consider when selecting vocabulary: (a) contexts/environments where the vocabulary can be used, (b) time span during which the vocabulary will be relevant, (c) whether the vocabulary can elicit and maintain interactions with other people, and (d) whether the vocabulary will facilitate developmentally appropriate grammatical structures. This tutorial focuses on the role that these variables play in language development in verbal children with typical development, verbal children with language impairment, and nonverbal children who use AAC. Results Use of the 4 variables highlighted above may help practicing SLPs select vocabulary that will best facilitate language acquisition in preliterate children who use AAC.

Core vocabulary in the narratives of bilingual children with and without language impairment

PURPOSE

Children with primary language impairment (PLI) demonstrate deficits in morphosyntax and vocabulary. We studied how these deficits may manifest in the core vocabulary use of bilingual children with PLI.

METHOD

Thirty bilingual children with and without PLI who were matched pairwise (experimental group) narrated two Spanish and two English stories in kindergarten and first grade. Core vocabulary was derived from the 30 most frequently used words in the stories of 65 and 37 typically developing (TD) first graders (normative group) for Spanish and English, respectively. The number of words each child in the experimental group produced out of the 30 identified core vocabulary words and frequency of each of the core words produced each year were analysed.

RESULT

Children with PLI produced fewer core vocabulary words compared to their TD peers after controlling for total words produced. This difference was more pronounced in first grade. They produced core vocabulary words less frequently in kindergarten than their TD peers. Both groups produced core vocabulary words more frequently in English than Spanish.

CONCLUSIONS

Bilingual children with PLI demonstrate a less productive core vocabulary use compared to their TD peers in both their languages illustrating the nature of their grammatical and lexical-semantic deficits.

Core vocabulary of young children with Down syndrome

The aim of this study was to develop a core vocabulary list for young children with intellectual disabilities between 2 and 7 years of age because data from this population are lacking in core vocabulary literature. Children with Down syndrome are considered one of the most valid reference groups for researching developmental patterns in children with intellectual disabilities; therefore, spontaneous language samples of 30 Dutch children with Down syndrome were collected during three different activities with multiple communication partners (free play with parents, lunch- or snack-time at home or at school, and speech therapy sessions). Of these children, 19 used multimodal communication, primarily manual signs and speech. Functional word use in both modalities was transcribed. The 50 most frequently used core words accounted for 67.2% of total word use; 16 words comprised core vocabulary, based on commonality. These data are consistent with similar studies related to the core vocabularies of preschoolers and toddlers with typical development, although the number of nouns present on the core vocabulary list was higher for the children in the present study. This finding can be explained by manual sign use of the children with Down syndrome and is reflective of their expressive vocabulary ages.

Practitioner Review: Multilingualism and neurodevelopmental disorders - an overview of recent research and discussion of clinical implications

BACKGROUND

Language and communication skills are essential aspects of child development, which are often disrupted in children with neurodevelopmental disorders. Cutting edge research in psycholinguistics suggests that multilingualism has potential to influence social, linguistic and cognitive development. Thus, multilingualism has implications for clinical assessment, diagnostic formulation, intervention and support offered to families. We present a systematic review and synthesis of the effects of multilingualism for children with neurodevelopmental disorders and discuss clinical implications.

METHODS

We conducted systematic searches for studies on multilingualism in neurodevelopmental disorders. Keywords for neurodevelopmental disorders were based on Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition categories as follows; Intellectual Disabilities, Communication Disorders, Autism Spectrum Disorder (ASD), Attention-Deficit/Hyperactivity Disorder, Specific Learning Disorder, Motor Disorders, Other Neurodevelopmental Disorders. We included only studies based on empirical research and published in peer-reviewed journals.

RESULTS

Fifty studies met inclusion criteria. Thirty-eight studies explored multilingualism in Communication Disorders, 10 in ASD and two in Intellectual Disability. No studies on multilingualism in Specific Learning Disorder or Motor Disorders were identified. Studies which found a disadvantage for multilingual children with neurodevelopmental disorders were rare, and there appears little reason to assume that multilingualism has negative effects on various aspects of functioning across a range of conditions. In fact, when considering only those studies which have compared a multilingual group with developmental disorders to a monolingual group with similar disorders, the findings consistently show no adverse effects on language development or other aspects of functioning. In the case of ASD, a positive effect on communication and social functioning has been observed.

CONCLUSIONS

There is little evidence to support the widely held view that multilingual exposure is detrimental to the linguistic or social development of individuals with neurodevelopmental disorders. However, we also note that the available pool of studies is small and the number of methodologically high quality studies is relatively low. We discuss implications of multilingualism for clinical management of neurodevelopmental disorders, and discuss possible directions for future research.

Vocabulary Selection in AAC: Application of Core Vocabulary in Atypical Populations

On the American Speech-Language-Hearing Association Community for Special Interest Group 12, Augmentative and Alternative Communication (AAC), a community member introduced a discussion related to the selection and use of core vocabulary with students with severe intellectual or multiple disabilities. It was questioned whether or not core vocabulary determined in typically developing children was applicable to AAC intervention in these students. The present article reviewed a vast amount of language sample studies related to core vocabulary in both typical and atypical populations. It was concluded that core vocabulary is comparable for both populations in various contexts, with various communication partners, over various topics, and in various modalities of language use. Core vocabulary is thus of high importance for all AAC users, regardless of physical or intellectual disabilities.