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1.
Am J Speech Lang Pathol ; 33(4): 2041-2050, 2024 Jul 03.
Article in English | MEDLINE | ID: mdl-38619451

ABSTRACT

PURPOSE: Dyadic caregiver-child interactions are commonly used to examine children's language learning environments. However, children frequently interact with multiple caregivers and/or siblings if they come from homes with multiple caregivers and siblings. Thus, we examined if and how caregiver opportunities to respond (OTRs) varied when sampled across three interaction configurations. METHOD: Twelve children with Down syndrome (Mage = 40.82 months) and their biological parents participated in the current study. We collected separate mother-child and father-child dyadic interactions and one family choice interaction (i.e., both caregivers present and occasionally siblings) in families' homes. We analyzed if differences in the caregiver's OTR frequency and type-explicit and implicit-existed among dyadic and family choice configurations. RESULTS: We found that, during family choice interactions, children were exposed to fewer OTRs when combining the total number of father and mother OTRs compared to dyadic caregiver-child interactions. This effect was large for explicit OTRs (mother-dyadic vs. combined family choice: g = -1.99, confidence interval [CI] [-3.00, -1.00]; father-dyadic vs. combined family choice: g = -0.84, CI [-1.84, -0.11]). For implicit OTRs, effects were small for mother-dyadic versus combined family choice (g = -0.34, CI [-1.17, 0.48]) and negligible when comparing father-dyadic with combined family choice (g = -0.08, CI [-0.90, 0.73]). CONCLUSION: Our preliminary findings highlight the need for a more nuanced understanding of children's language learning environments to better understand how caregivers support their children's language development. SUPPLEMENTAL MATERIAL: https://doi.org/10.23641/asha.25579905.


Subject(s)
Caregivers , Down Syndrome , Humans , Down Syndrome/psychology , Male , Female , Child, Preschool , Caregivers/psychology , Mother-Child Relations , Child Language , Father-Child Relations , Adult , Parent-Child Relations , Family Relations/psychology
2.
Dev Psychobiol ; 66(2): e22461, 2024 Feb.
Article in English | MEDLINE | ID: mdl-38388193

ABSTRACT

Researchers are increasingly utilizing physiological data like electrodermal activity (EDA) to understand how stress "gets under the skin." Results of EDA studies in autistic children are mixed, with some suggesting autistic hyperarousal, others finding hypoarousal, and yet others detecting no difference compared to non-autistics. Some of this variability likely stems from the different techniques used to assess EDA. Therefore, the purpose of this study is to investigate and compare commonly used metrics of EDA (frequency of peaks, average amplitude of peaks, and standard deviation of skin conductance level) using two data processing programs (NeuroKit2 and Ledalab) and their link to observed child behavior. EDA data were collected using Empatica E4 wristbands from 60 autistic children and adolescents (5-18 years old) during a 7-min play interaction with their primary caregiver. The play interaction was coded for a range of child behaviors including mood, social responsiveness, dysregulation, and cooperation. Results indicate a strong correlation between NeuroKit2 and Ledalab and a weak correlation between metrics within each program. Furthermore, the frequency of peaks was associated with more positive child social behaviors, and the magnitude of peaks was associated with less adaptive child behaviors. Recommendations for replication and the need for generalizability of this research are given.


Subject(s)
Autism Spectrum Disorder , Child , Adolescent , Humans , Child, Preschool , Autism Spectrum Disorder/diagnosis , Galvanic Skin Response , Child Behavior , Social Behavior , Affect
3.
Autism Res ; 17(3): 452-458, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38148499

ABSTRACT

The past three decades have seen an exponential increase in the publication of children's books about autism. This increased availability of children's books is exciting because they have the power to promote understanding, acceptance, and appreciation of neurodiversity. However, growing concerns have been raised by both autistic and non-autistic people that some children's books about autism may work against neurodiversity, rather than promoting it. This Commentary discusses the strikingly different ways in which children's books about autism portray key concepts related to neurodiversity, including autistic differences, agency, abilities, and communication. We present concrete examples (including books by autistic authors); highlight the views of autistic and non-autistic parents of autistic children; and discuss how different books may leave readers with different impressions of autism and neurodiversity. Given the vastly different themes that emerge across different books, we conclude that it is important for educators, families, and other members of the autism community to make informed and individualized choices about what books they use for what purpose. We emphasize the need for systematic, high-quality research on children's books about autism, including content analyses and studies that determine what messages these books send to their intended audience: children. It is vital that autistic people continue to shape this conversation, contributing unique insights that inform research priorities and the methodological approaches used to investigate them.


Subject(s)
Autism Spectrum Disorder , Autistic Disorder , Child , Humans , Parents , Books
4.
J Speech Lang Hear Res ; 66(8): 2750-2765, 2023 08 03.
Article in English | MEDLINE | ID: mdl-37467394

ABSTRACT

PURPOSE: Using a novel parent report measure, this study investigated whether asking parents to rate their certainty when reporting on child vocabulary skills provided additional insight into parent report and emerging language abilities in young autistic children. Specifically, we investigated whether parent certainty varied based on whether the child was reported to understand, understand and say, or neither understand nor say the word and whether standardized measures of expressive and receptive language abilities and/or autistic traits predicted parent certainty. Lastly, we investigated whether certainty was associated with inconsistency in parent report of child word knowledge. METHOD: Twenty-one parents and their autistic children ages 2-5 years participated. One parent per child completed the MacArthur-Bates Communicative Development Inventories (MCDI) Words and Gestures form and a custom vocabulary checklist including 24 object nouns from the MCDI. Within the custom form, parents indicated whether their child understood, understood and said, or neither understood nor said 24 target nouns and reported how certain they were about their responses using a 5-point scale. Expressive language, receptive language, and autistic traits were measured via direct assessment using standardized measures. RESULTS: Parent certainty varied widely and was higher for words the parents reported the children understood and said compared to that for words children either understood or neither understood nor said. Certainty ratings were higher when a child had higher standardized receptive and expressive language scores. Lastly, parent certainty was associated with reporting consistency, clarifying previous findings of inconsistencies in parent report of child vocabulary. CONCLUSION: Findings from this study indicate that measuring parent certainty provides critical information when assessing early vocabulary skills in autistic children. SUPPLEMENTAL MATERIAL: https://doi.org/10.23641/asha.23671497.


Subject(s)
Autistic Disorder , Vocabulary , Humans , Checklist , Language , Language Development , Child, Preschool
5.
J Autism Dev Disord ; 53(6): 2373-2383, 2023 Jun.
Article in English | MEDLINE | ID: mdl-35325339

ABSTRACT

Autistic youth are at risk for internalizing mental health problems such as depression and anxiety. Similarly, parents of autistic youth report higher levels of depression than parents of typically developing children. The goal of this study was to examine bidirectional associations between parent depression symptoms and the internalizing problems of autistic youth in 188 families across four time points (T1-T4; spaced 12 months apart). A cross-lagged panel model revealed that mother (T1 and T2) and father (T1) depression symptoms positively predicted the youth's internalizing problems 12 months later. The youth's internalizing problems at T3 positively predicted maternal depression symptoms at T4. Future research should explore genetic and environmental pathways that link parent depression and internalizing problems in autistic youth.


Subject(s)
Autism Spectrum Disorder , Autistic Disorder , Female , Adolescent , Humans , Child , Depression/epidemiology , Depression/psychology , Mental Health , Parents/psychology
6.
Am J Intellect Dev Disabil ; 127(3): 231-248, 2022 05 01.
Article in English | MEDLINE | ID: mdl-35443052

ABSTRACT

This study investigated the bidirectional effects of change in maladaptive behaviors among adolescents and adults with fragile X syndrome (FXS) and change in their intergenerational family relationships over a 7.5-year period. Indicators of the intergenerational family relationship between premutation carrier mothers and their adolescent or adult son/daughter with FXS included a measure of the quality of the relationship, as well as descriptions provided by mothers of their relationship with their son/daughter (positive remarks, critical remarks). Maladaptive behaviors decreased, maternal positive remarks increased, and maternal critical remarks and relationship quality remained stable over time. Bidirectional effects of change were observed in predicting maladaptive behaviors and maternal positive remarks, although maladaptive behaviors more strongly predicted positive remarks than the reciprocal association. This research suggests prioritizing maladaptive behaviors in the context of family interventions.


Subject(s)
Fragile X Syndrome , Adolescent , Adult , Family Relations , Female , Fragile X Mental Retardation Protein/genetics , Fragile X Syndrome/genetics , Humans , Mothers
7.
J Child Lang ; : 1-13, 2022 Apr 07.
Article in English | MEDLINE | ID: mdl-35388779

ABSTRACT

Young children with Down syndrome (DS) have language delays beginning early in life. Book reading with parents provides a context for capitalizing on language learning opportunities. This study evaluated the quantity and quality of language input among mothers and fathers of young children with DS during book reading interactions and investigated associations with child language. Findings revealed that mothers were more talkative and used more descriptive language, whereas fathers spent more time reading the book text. Moreover, maternal and paternal input were correlated with different measures of child language, suggesting that mothers and fathers may use divergent approaches to support language development.

8.
Augment Altern Commun ; 38(1): 41-52, 2022 03.
Article in English | MEDLINE | ID: mdl-35422176

ABSTRACT

This survey study examined augmentative and alternative communication (AAC) practices reported by early intervention speech-language pathologists (SLPs) across the United States (N = 376). The study examined (a) types of AAC that SLPs reported using (i.e., sign language, photographs, pictures, symbols, talking switches, and iPad apps or dedicated speech-generating devices); (b) SLPs' perspectives on the influence of child spoken language ability on AAC recommendations; (c) factors that influenced AAC decision-making within early intervention; and (d) perceived barriers associated with AAC implementation. SLPs reported that they were significantly more likely to introduce all types of AAC to children without spoken language abilities compared to children in later stages of language development. On average, they were most likely to report using or recommending sign language and photographs, and least likely to report using or recommending talking switches or speech-generating devices. Of the options provided, child expressive and receptive language abilities were rated as the most important factors to consider when determining AAC use, followed by cognitive ability, diagnosis, and chronological age. SLPs identified caregiver buy-in and carryover across providers as the most significant barriers to AAC implementation. Recommendations for future research and current AAC practices within early intervention are discussed.


Subject(s)
Communication Aids for Disabled , Communication Disorders , Speech-Language Pathology , Child , Communication , Humans , Pathologists , Speech
9.
J Autism Dev Disord ; 52(2): 897-907, 2022 Feb.
Article in English | MEDLINE | ID: mdl-33768421

ABSTRACT

Autism spectrum disorder (ASD) and fragile X syndrome (FXS) are neurodevelopmental disorders with overlapping pragmatic language impairments. Prior work suggests pragmatic language differences may run in families. This study examined specific pragmatic difficulties (i.e., linguistic mazes and perseverations) in boys (9-18 years) with idiopathic ASD (n = 26) and FXS+ASD (n = 29), and relationships with maternal maze use. Language samples were obtained separately for boys and mothers. Nonparametric analyses suggested that boys largely did not differ in their rates of mazes, but that boys with FXS+ASD exhibited more perseverations. Mazes were correlated between fragile X dyads. Maternal mazes were correlated with child perseverations among idiopathic ASD dyads. These findings have implications for the etiological significance of ASD-related language phenotypes.


Subject(s)
Autism Spectrum Disorder , Fragile X Syndrome , Humans , Language Tests , Linguistics , Male , Schools
10.
J Autism Dev Disord ; 52(6): 2463-2478, 2022 Jun.
Article in English | MEDLINE | ID: mdl-34129130

ABSTRACT

This study examined differences in mother-child relationship quality and parent-rated child behavior problems based on child verbal status (i.e., minimally verbal versus verbal) in mothers and their adolescent and adult children with autism spectrum disorder (n = 219 dyads; child Mage = 25.38 years, SD = 10.22). Relationship quality was assessed via parent-reported maternal burden and mother-child closeness, and coded speech samples ascertaining maternal critical and positive remarks regarding the child. Groups did not differ in relationship quality. The verbal group was more likely to display disruptive and socially inappropriate behaviors, but otherwise the groups did not differ in behavior problems. Verbal status moderated the relationship between behavior problems and negative (maternal burden, critical remarks) but not positive (mother-child closeness, positive remarks) aspects of relationship quality.


Subject(s)
Autism Spectrum Disorder , Problem Behavior , Adolescent , Adult , Female , Humans , Mother-Child Relations , Mothers , Parents
11.
Am J Speech Lang Pathol ; 30(4): 1767-1780, 2021 07 14.
Article in English | MEDLINE | ID: mdl-34153191

ABSTRACT

Purpose The goal of this study was to characterize and quantify maternal use of decontextualized and contextualized input during mother-child interactions including young children with Down syndrome (DS). Method Participants included 22 mother-child dyads with DS (M age = 42.8 months) and 22 mother-child dyads with typical development (M age = 44.0 months). Parent-child language samples were collected during free-play, book reading, and snack time, and coded for maternal decontextualized (i.e., pretend, explanatory, and narrative talk) and contextualized input (i.e., descriptions, conversation, praise, questions, and directives). Results Mothers of children with DS used a larger proportion of pretend talk compared to other types of decontextualized input and also used a larger proportion of questions, conversation, and descriptions compared to other types of contextualized language. Mothers of children with DS generally used a smaller proportion of decontextualized input compared to mothers of children with typical development, with the exception of pretend talk. Maternal decontextualized input was not related to children's age or language ability in DS. Conclusions Findings shed new light on the early language environments of children with DS, providing important insight into the ways that mothers of children with DS are incorporating decontextualized and contextualized talk into early mother-child conversations. Additional implications and future directions are discussed.


Subject(s)
Down Syndrome , Child , Child Language , Child, Preschool , Down Syndrome/diagnosis , Female , Humans , Language Development , Mother-Child Relations , Parent-Child Relations
12.
Am J Speech Lang Pathol ; 30(3): 1203-1209, 2021 05 18.
Article in English | MEDLINE | ID: mdl-33979208

ABSTRACT

Purpose This study investigated maternal and paternal command use and child compliance in children with Down syndrome during mother-child and father-child free-play interactions. We also examined child compliance to direct versus indirect commands, and the relationships between maternal command use, paternal command use, child compliance, and child speech and language abilities. Method Fifteen families including a mother, father, and child with Down syndrome participated. Mother-child and father-child dyads participated in free-play interactions. We coded overall parent command use, command type (direct or indirect), and child compliance with the commands. Child language abilities were measured using a standardized assessment as well as during free-play. Results Mothers and fathers of children with Down syndrome used a similar number of commands, and children complied similarly across interactions. Children were more likely to comply with direct versus indirect commands. Parent command use was related to child language abilities in different ways for mothers and fathers. Child compliance was not related to receptive or expressive language abilities. Conclusions Mothers and fathers of children with Down syndrome use commands in similar ways but may base their command use on different child factors. Using direct commands with children with Down syndrome may be beneficial when increasing compliance during early interactions.


Subject(s)
Down Syndrome , Child , Down Syndrome/diagnosis , Fathers , Female , Humans , Male , Mother-Child Relations , Mothers , Parent-Child Relations , Parents
13.
Fam Syst Health ; 38(4): 476-481, 2020 12.
Article in English | MEDLINE | ID: mdl-32853000

ABSTRACT

INTRODUCTION: Despite robust evidence in the broader family process literature for within-couple associations between romantic partners' physiological responding, this linkage has not been tested directly among parents raising a child with autism spectrum disorder (ASD). Explicit attention to these parents is warranted on the basis of the established family-wide challenges associated with the persistent emotional, functional, and behavior impairments typically observed in children with ASD (see Karst & Van Hecke, 2012). The first purpose of this study is to extend examination of within-couple associations between electrodermal activity (EDA) to mothers and fathers of children with ASD. The second purpose is to test 2 potential moderators of EDA synchrony reflecting heightened challenges among parents of children with ASD, namely parenting as an observed conflict topic and global parenting stress. METHOD: Both parents wore wrist sensors that captured continuous EDA during a recorded marital conflict interaction. Trained coders provided ratings of emotional intensity and conflict topics, including whether the topic of parenting was discussed. Parents reported their global level of parenting stress. Dyadic multilevel modeling was used to test our hypotheses and accounted for interaction factors (e.g., movement data, emotional intensity). RESULTS: Findings identified significant positive associations between parents' EDA. One moderator result emerged; specifically, father EDA was a stronger predictor of mother EDA when parenting was discussed as a conflict topic. CONCLUSION: This study extends evidence of within-couple physiological linkage to parents raising a child with ASD and provides a foundation for future research examining the family-wide implications of this linkage. (PsycInfo Database Record (c) 2021 APA, all rights reserved).


Subject(s)
Autism Spectrum Disorder/complications , Galvanic Skin Response/physiology , Parenting/psychology , Adolescent , Autism Spectrum Disorder/psychology , Autism Spectrum Disorder/therapy , Child , Cost of Illness , Family Conflict/psychology , Female , Humans , Male , Stress, Psychological/complications , Stress, Psychological/psychology , Surveys and Questionnaires
14.
Am J Speech Lang Pathol ; 29(3): 1475-1488, 2020 08 04.
Article in English | MEDLINE | ID: mdl-32463706

ABSTRACT

Purpose Communication interactions between parents and children during shared book reading impact a child's development of both language and literacy skills. This study examined maternal language input and child expressive communication during a shared book reading activity in children with Down syndrome (DS) and children with typical development (TD). Additionally, children's receptive language was examined to understand the relationship between maternal language input and child receptive language ability. Method Participants included 22 children with DS and 22 children with TD between 22 and 63 months of age and their mothers. Each mother-child dyad participated in a 7-min naturalistic shared book reading activity. Results Compared to mothers of children with TD, mothers of children with DS used significantly more utterances with less grammatical complexity, but a similar range of vocabulary diversity. Mothers of children with DS used more questions, descriptions, gestures, and labels, whereas mothers of children with TD used nearly half of their utterances to read directly from books. Children with DS communicated at a similar frequency compared to their peers with TD; however, they produced significantly fewer spoken words. Conclusions This study reveals important differences between early shared book reading interactions and provides implications for future research targeting parent-coached intervention strategies that may enhance children's learning during shared book reading by providing access to expressive language and print instruction.


Subject(s)
Down Syndrome , Reading , Books , Child , Child Language , Comprehension , Down Syndrome/diagnosis , Female , Humans , Language Development , Mother-Child Relations , Vocabulary
15.
J Speech Lang Hear Res ; 63(6): 1822-1834, 2020 06 22.
Article in English | MEDLINE | ID: mdl-32421422

ABSTRACT

Purpose Question-asking serves as a tool to learn new information and is important in both academic and social settings. Boys with idiopathic autism spectrum disorder (ASD) and boys with fragile X syndrome and comorbid ASD (FXS + ASD) have similar social communication deficits, which may have downstream effects on their question-asking ability. This study examined question-asking in school-age boys with idiopathic ASD and FXS + ASD, including the role of ASD severity, expressive grammatical complexity (measured by mean length of utterance [MLU]), and IQ. Method Twenty-five boys with FXS + ASD and 21 boys with idiopathic ASD (ages 9-16 years) were included in this study. Autism Diagnostic Observation Schedule assessments were transcribed and coded for the frequency, function, and appropriateness of spontaneous questions asked. We examined group differences in these aspects of question-asking and relationships between question-asking and ASD severity, MLU, and IQ within each group. Results Boys with FXS + ASD asked more questions than boys with idiopathic ASD, although boys with idiopathic ASD asked a higher proportion of appropriate questions. Boys with idiopathic ASD also asked the examiner more personal questions than the boys with FXS + ASD. ASD severity and MLU were related to the proportion of clarification questions in FXS + ASD, and ASD severity was also related to the proportion of personal questions in this group. For the boys with idiopathic ASD, ASD severity was related to the total number of questions asked. Conclusions Our findings highlight similarities and differences between boys with FXS + ASD and idiopathic ASD in their spontaneous question production and indicate that ASD severity and grammatical language are differentially important for question-asking. This study has implications for targeted treatment in question-asking skills for boys with FXS + ASD and ASD.


Subject(s)
Autism Spectrum Disorder , Fragile X Syndrome , Adolescent , Autism Spectrum Disorder/complications , Autism Spectrum Disorder/epidemiology , Child , Child Language , Fragile X Syndrome/complications , Fragile X Syndrome/epidemiology , Humans , Language , Language Tests , Male
16.
J Child Lang ; 47(1): 225-249, 2020 01.
Article in English | MEDLINE | ID: mdl-31587679

ABSTRACT

Maternal input influences language development in children with Down syndrome (DS) and typical development (TD). Telegraphic input, or simplified input violating English grammatical rules, is controversial in speech-language pathology, yet no research to date has investigated whether mothers of children with DS use telegraphic input. This study investigated the quality of linguistic input to children with DS compared to age-matched children with TD, and the relationship between maternal input and child language abilities. Mothers of children with DS simplified their input in multiple ways, by using a lower lexical diversity, shorter utterances, and more telegraphic input compared to mothers of children with TD. Telegraphic input was not significantly correlated with other aspects of maternal input or child language abilities. Since children with DS demonstrate specific deficits in grammatical compared to lexical abilities, future work should investigate the long-term influence of maternal telegraphic input on language development in children with DS.


Subject(s)
Down Syndrome , Language Development , Mother-Child Relations , Speech , Child Language , Child, Preschool , Female , Humans , Infant , Language Development Disorders , Linguistics , Male , Mothers
17.
Clin Linguist Phon ; 33(5): 420-436, 2019.
Article in English | MEDLINE | ID: mdl-30346853

ABSTRACT

Demonstratives (e.g. here, that, these) and personal pronouns are early developing components of language, which are often impaired in young children with autism spectrum disorder (ASD). Additionally, demonstrative and personal pronoun use are linked to joint attention and language ability early in life for individuals with ASD. Fragile X syndrome (FXS) is a genetic disorder with a significant amount of overlap in its behavioural phenotype with ASD. The present study examined demonstrative and personal pronoun production during a conversation sample in adolescent boys with ASD and adolescent boys with FXS with a co-diagnosis of ASD (FXS+ASD). Findings indicated that grammatical complexity was related to both qualitative and quantitative aspects of demonstrative and personal pronoun production in boys with ASD, while grammatical complexity was related to the total number of demonstratives and personal pronouns produced in the boys with FXS+ASD. ASD severity was not related to demonstrative or personal pronoun production in ASD, although it was negatively correlated with the total number of personal pronouns produced by the boys with FXS. Additionally, groups did not differ significantly in production of personal pronouns, but they did differ significantly in multiple aspects of demonstrative use. Findings suggest that these groups produce similar rates of personal pronouns in the school-age years, while production of demonstratives differentiates these groups. This study contributes to the knowledge of the language phenotypes of idiopathic ASD and FXS+ASD, and provides implications for intervention targets for school-age children with these disorders.


Subject(s)
Autism Spectrum Disorder/complications , Communication , Fragile X Syndrome/complications , Language , Adolescent , Child , Humans , Male
18.
Am J Speech Lang Pathol ; 27(3): 1018-1029, 2018 08 06.
Article in English | MEDLINE | ID: mdl-29971356

ABSTRACT

Purpose: This study compared gesture use in young children with Down syndrome (DS) and typical development (TD) as well as how mothers respond to child gestures based on child age and diagnosis. Method: Twenty-two mother-child dyads with DS and 22 mother-child dyads with TD participated. The child participants were between 22 and 63 months and were matched on chronological age. We coded child gesture use and whether mothers recoded child gestures (i.e., provided a verbal translation) during naturalistic interactions. Results: The children with DS used more gestures than peers with TD. After controlling for expressive language ability, the two groups were not significantly different on child gesture use. Regardless of child diagnosis, mothers recoded approximately the same percentage of child gestures. There was a significant interaction between child diagnosis and child age when predicting the percentage of maternal gesture recodes; mothers of children with DS did not demonstrate differences in the percentage of maternal gesture recodes based on child age, but there was a negative relationship between the percentage of maternal gesture recodes and child age for the children with TD. Conclusions: Young children with DS gesture more than chronological age-matched children with TD, therefore providing numerous opportunities for caregivers to recode child gestures and support language development. Early intervention should focus on increasing parent responsiveness to child gestures earlier in life in order to provide additional word-learning opportunities for children with DS.


Subject(s)
Child Behavior , Child Language , Communication , Disabled Children/psychology , Down Syndrome/psychology , Gestures , Maternal Behavior , Mother-Child Relations , Age Factors , Case-Control Studies , Child, Preschool , Cross-Sectional Studies , Down Syndrome/diagnosis , Female , Humans , Male , Play and Playthings , Reading , Recognition, Psychology , Speech Acoustics , Speech Intelligibility , Verbal Behavior , Video Recording , Voice Quality
19.
Article in English | MEDLINE | ID: mdl-30345371

ABSTRACT

BACKGROUND & AIMS: This study compared gesture rate and purpose in participants with Down syndrome (DS) and fragile X syndrome (FXS), and the impact of autism spectrum disorder (ASD) symptoms on each syndrome. METHODS: Twenty individuals with fragile X syndrome and 20 individuals with Down syndrome between nine and 22 years of age participated in this study. We coded gesture rate and purpose from an autism spectrum disorder evaluation, the Autism Diagnostic Observation Schedule - Second Edition. RESULTS: We did not find between-group differences (Down syndrome compared to fragile X syndrome) in gesture rate or purpose. Notably, as autism spectrum disorder symptoms increased, the group with Down syndrome produced a lower rate of gestures, but used gestures for the same purpose. Gesture rate did not change based on autism spectrum disorder symptoms in the participants with fragile X syndrome, but as autism spectrum disorder symptoms increased, the participants with fragile X syndrome produced a larger proportion of gestures to regulate behavior and a smaller proportion for joint attention/social interaction. CONCLUSIONS: Overall, the amount or purpose of gestures did not differentiate individuals with Down syndrome and fragile X syndrome. However, the presence of autism spectrum disorder symptoms had a significant and unique impact on these genetic disorders. In individuals with Down syndrome, the presence of more autism spectrum disorder symptoms resulted in a reduction in the rate of gesturing, but did not change the purpose. However, in fragile X syndrome, the rate of gestures remained the same, but the purpose of those gestures changed based on autism spectrum disorder symptoms. IMPLICATIONS: Autism spectrum disorder symptoms differentially impact gestures in Down syndrome and fragile X syndrome. Individuals with Down syndrome and more autism spectrum disorder symptoms are using gestures less frequently. Therefore, clinicians may need to consider children with Down syndrome demonstrating symptoms of autism spectrum disorder as distinctly different from children with Down syndrome and few to no symptoms of autism spectrum disorder when implementing interventions or therapy techniques. Severity of autism spectrum disorder symptoms in fragile X syndrome affects qualitative gesture use and motivation to communicate through social gestures, which may be an appropriate goal to target in children with fragile X syndrome and heightened autism spectrum disorder symptoms.

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