1. Al Dera H, Alrafaei B, Al Tamimi MI, Alfawaz HA, Bhat RS, Soliman DA, Abuaish S, El-Ansary A. Leaky gut biomarkers in casein- and gluten-rich diet fed rat model of autism. Translational neuroscience. 2021; 12(1): 601-10.

It is proposed that gluten- and casein-rich diets (GRD and CRD) can synergistically exacerbate dysbiosis as comorbidity in autism by worsening leaky gut that affects the brain through the gut-brain axis. In this study, 35 young male rats were divided into 7 groups, Group 1 serves as control; Group 2, clindamycin (CL)-treated; and Group 3, propionic acid (PPA)-induced rodent model of autism. These three groups were fed standard diet until the end of the experiment. Groups 4-7 are rats treated similarly with CL and PPA, then fed on CRD or GRD until the end of the experiment. Serum zonulin, glutathione (GSH), lipid peroxides, and gut microbial composition were measured in the seven studied groups. Data demonstrate the significant increase in serum zonulin as marker of leaky gut in the CL-treated groups fed on CRD or GRD. Lipid peroxides were significantly higher in the serum of GRD-fed rats compared to CRD-fed or normal diet-fed rats. GSH was much lower in CL-treated groups fed on CRD or GRD compared to PPA-treated rats fed on both diets. Both diets differentially affected the diversity of the gut microbiota. This study demonstrates that CRD and GRD exacerbates leaky gut, according to serum zonulin, which was used as marker for increased gut permeability.

Lien vers le texte intégral (Open Access ou abonnement)

2. AlHumaid J. Dental experiences related to oral care of children with autism spectrum disorders in Saudi Arabia: A literature review. The Saudi dental journal. 2022; 34(1): 1-10.

The burden of autism spectrum disorder (ASD) in Saudi Arabia remains unclear with a dearth of literature, which focus on risk factors, prevalence, or interventions. This study is a review of the published literature related to dental experiences of children with ASD in Saudi Arabia. Twenty-two studies were included in this review, based on the predefined inclusion criteria which examined dental disease prevalence in children with ASD, identified the risk factors and the potential barriers to oral care. Results uncovered a lack of systematically published studies from Saudi Arabia which might have led to the limited development of effective oral health policies in the Kingdom. Identification of research gaps and potential intervention policies are needed to improve the oral health and quality of life of children with ASD in Saudi Arabia.

Lien vers le texte intégral (Open Access ou abonnement)

3. Cooper DS, Uppal D, Railey KS, Blank Wilson A, Maras K, Zimmerman E, Bornman J, Shea LL. Policy gaps and opportunities: A systematic review of autism spectrum disorder and criminal justice intersections. Autism : the international journal of research and practice. 2022: 13623613211070341.

The number of people with autism spectrum disorder has increased, and as this population ages, research is showing high rates of contact with the criminal justice system among this group. Social and communication differences that autistic individuals experience can act as a risk factor during these interactions, as shown by public reports of negative and violent encounters between autistic individuals and the law enforcement. There is a clear need for evidence-based strategies to reduce high rates of contact and to improve outcomes when an interaction occurs. This article provides a systematic review of research on autism spectrum disorder and criminal justice system to compile this evidence base. The Preferred Reporting Items for Systematic Reviews and Meta-Analysis structure was used to identify 89 articles after searching six databases. The Sequential Intercept Model describes the criminal justice system as different stages, or intercepts, that are connected, and the Sequential Intercept Model serves as an overall framework to organize the included articles. Articles were analyzed to identify research themes at each intercept, which offer guidance for policy and program changes that support equitable justice for autistic individuals.

Lien vers le texte intégral (Open Access ou abonnement)

4. Fang Z, Lachman JM, Zhang C, Qiao D, Barlow J. A virtuous circle: Stakeholder perspectives of a short-term intensive parent training programme delivered within the context of routine services for autism in China. Autism : the international journal of research and practice. 2022: 13623613211070869.

While much knowledge about autism derives from high-income countries, most people diagnosed with autism reside in low- and middle-income countries, where little is documented in terms of local interventions. This is also true for parent training programmes for families of autistic children. An evaluation was conducted to understand the effects of a short-term intensive parent training programme delivered in routine services for families of autistic children in China. This study reported results from the in-depth interviews with 14 participating caregivers and group discussions with eight group leaders. The interviews and discussions were aimed at learning (1) to what extent the programme components were deemed acceptable, (2) what affected caregivers’ attendance and engagement in the programme and (3) what affected group leaders’ delivery of the programme. Findings suggested that future parent training programmes provide adequate opportunities for caregivers to practice and receive feedback; group support; coaching experience tailored to individual challenges; more autism-related knowledge, resources and activities for children and extended family members; and organisational support to group leaders. This study highlights the value of qualitative research and points to the need for more empirical studies to address the recommendations, so that research findings can be better utilised to promote practices.

Lien vers le texte intégral (Open Access ou abonnement)

5. Han HJ, Lee J, Lim G, Park J, Gautam R, Jo J, Kim C, Heo Y. Metal arsenic mediated enhancement of type-2 immunity in brains with altered locomotive activities in mice with autism-like behavioral characteristics. Toxicological research. 2022; 38(1): 27-33.

Exposure to metal arsenic (As) has been proposed as a risk factor for autism spectrum disorders (ASDs), which are neurodevelopmental disorders with worldwide increasing in its incidence. In the present study, BTBR T + tf/J (BTBR) mice with ASD-like behavioral characteristics and control highly social FVB mice were orally exposed to 0.1 mM arsenic(III)oxide for 4 weeks, and were compared to investigate neuroimmunological or behavioral abnormalities. IgG1:IgG2a ratios in brain tissues from BTBR mice exposed to As (BTBR-As) were significantly higher than those of BTBR-control mice (BTBR-C), but this change did not occur in FVB mice exposed to As. Levels of IL-4, IFN-γ, IL-1β, IL-17, and TNF-α in brain tissue were lowered in BTBR-As relative to BTBR-C, but this tendency was not observed with FVB mice. BTBR-As mice demonstrated decrease in relative travel distance and time spent in the center vs. the periphery of open field arena compared to BTBR-C. Sociability evaluation using three-way chamber test did not clearly demonstrate As-mediated alteration in social interaction in BTBR mice. These findings suggest the potential for As-driven predominant T(H)2-like reactivity profile in the brain microenvironment of BTBR mice and for As-mediated locomotive impairment probably associated with ASD.

Lien vers le texte intégral (Open Access ou abonnement)

6. Hollocks MJ, Wood JJ, Storch EA, Cho AC, Kerns CM, Kendall PC. Reward Sensitivity Predicts the Response to Cognitive Behavioral Therapy for Children with Autism and Anxiety. Journal of clinical child and adolescent psychology : the official journal for the Society of Clinical Child and Adolescent Psychology, American Psychological Association, Division 53. 2022: 1-8.

OBJECTIVE: Cognitive-behavioral therapy (CBT) is an effective treatment for anxiety in youth with autism spectrum disorder (ASD). However, research has yet to examine what cognitive characteristics may influence treatment response. The current study investigated decision-making ability and social cognition as potential (a) predictors of differential treatment response to two versions of CBT and (b) moderators of the effect of treatment condition. METHOD: The study included 148 children (mean age = 9.8 years) with interfering anxiety and a diagnosis of ASD who were enrolled in a randomized clinical trial comparing two versions of CBT for anxiety (standard and adapted for ASD). Participants completed pretreatment measures of decision-making ability (adapted Iowa Gambling Task) and social cognition (Strange Stories) and analyses tested whether task performance predicted treatment response across and between (moderation) treatment conditions. RESULTS: Our findings indicate that decision-making ability moderated treatment outcomes in youth with ASD and anxiety, with a better decision-making performance being associated with higher post-treatment anxiety scores for those who received standard, not adapted, CBT. CONCLUSIONS: Children with ASD and anxiety who are more sensitive to reward contingencies and reinforcement may benefit more from adapted CBT approaches that work more explicitly with reward.

Lien vers le texte intégral (Open Access ou abonnement)

7. Kerns CM, Lankenau S, Shattuck PT, Robins DL, Newschaffer CJ, Berkowitz SJ. Exploring potential sources of childhood trauma: A qualitative study with autistic adults and caregivers. Autism : the international journal of research and practice. 2022: 13623613211070637.

The stressors autistic individuals encounter and experience as traumatic may vary from those not on the spectrum and typically measured. We conducted in-depth interviews with autistic adults and caregivers of children and adults on the spectrum to identify potential sources of trauma for autistic individuals and evaluate the ability of a standard trauma measure to capture those experiences. Fourteen autistic adults and 15 caregivers with varied backgrounds, clinical profiles, and histories of adversity were interviewed. Participants also completed standard measures of autism, traumatic exposures, and stress. Interviews were analyzed to record both traditional sources of trauma, for comparison with the standard measure, and distinct sources, described as traumatic only in the narratives of participants. Participants described varied experiences as traumatic. Whereas some reflected traditional traumas (e.g. maltreatment) and forms of social marginalization, others reflected conflicts between autistic characteristics and the environment (e.g. sensory trauma). All adults and most caregivers described sources of trauma in interviews not reported on the standard measure. Results have implications for assessing traumatic events in autism and for understanding their contribution to the mental health of this group.

Lien vers le texte intégral (Open Access ou abonnement)

8. Key AP, Yan Y, Metelko M, Chang C, Kang H, Pilkington J, Corbett BA. Greater Social Competence Is Associated With Higher Interpersonal Neural Synchrony in Adolescents With Autism. Frontiers in human neuroscience. 2021; 15: 790085.

Difficulty engaging in reciprocal social interactions is a core characteristic of autism spectrum disorder. The mechanisms supporting effective dynamic real-time social exchanges are not yet well understood. This proof-of-concept hyperscanning electroencephalography study examined neural synchrony as the mechanism supporting interpersonal social interaction in 34 adolescents with autism spectrum disorder (50% female), age 10-16 years, paired with neurotypical confederates of similar age. The degree of brain-to-brain neural synchrony was quantified at temporo-parietal scalp locations as the circular correlation of oscillatory amplitudes in theta, alpha, and beta frequency bands while the participants engaged in a friendly conversation. In line with the hypotheses, interpersonal neural synchrony was significantly greater during the social interaction compared to the baseline. Lower levels of synchrony were associated with increased behavioral symptoms of social difficulties. With regard to sex differences, we found evidence for stronger interpersonal neural synchrony during conversation than baseline in females with autism, but not in male participants, for whom such condition differences did not reach statistical significance. This study established the feasibility of hyperscanning during real-time social interactions as an informative approach to examine social competence in autism, demonstrated that neural coordination of activity between the interacting brains may contribute to social behavior, and offered new insights into sex-related variability in social functioning in individuals with autism spectrum disorders.

Lien vers le texte intégral (Open Access ou abonnement)

9. Knipper M, Singer W, Schwabe K, Hagberg GE, Li Hegner Y, Rüttiger L, Braun C, Land R. Disturbed Balance of Inhibitory Signaling Links Hearing Loss and Cognition. Frontiers in neural circuits. 2021; 15: 785603.

Neuronal hyperexcitability in the central auditory pathway linked to reduced inhibitory activity is associated with numerous forms of hearing loss, including noise damage, age-dependent hearing loss, and deafness, as well as tinnitus or auditory processing deficits in autism spectrum disorder (ASD). In most cases, the reduced central inhibitory activity and the accompanying hyperexcitability are interpreted as an active compensatory response to the absence of synaptic activity, linked to increased central neural gain control (increased output activity relative to reduced input). We here suggest that hyperexcitability also could be related to an immaturity or impairment of tonic inhibitory strength that typically develops in an activity-dependent process in the ascending auditory pathway with auditory experience. In these cases, high-SR auditory nerve fibers, which are critical for the shortest latencies and lowest sound thresholds, may have either not matured (possibly in congenital deafness or autism) or are dysfunctional (possibly after sudden, stressful auditory trauma or age-dependent hearing loss linked with cognitive decline). Fast auditory processing deficits can occur despite maintained basal hearing. In that case, tonic inhibitory strength is reduced in ascending auditory nuclei, and fast inhibitory parvalbumin positive interneuron (PV-IN) dendrites are diminished in auditory and frontal brain regions. This leads to deficits in central neural gain control linked to hippocampal LTP/LTD deficiencies, cognitive deficits, and unbalanced extra-hypothalamic stress control. Under these conditions, a diminished inhibitory strength may weaken local neuronal coupling to homeostatic vascular responses required for the metabolic support of auditory adjustment processes. We emphasize the need to distinguish these two states of excitatory/inhibitory imbalance in hearing disorders: (i) Under conditions of preserved fast auditory processing and sustained tonic inhibitory strength, an excitatory/inhibitory imbalance following auditory deprivation can maintain precise hearing through a memory linked, transient disinhibition that leads to enhanced spiking fidelity (central neural gain⇑) (ii) Under conditions of critically diminished fast auditory processing and reduced tonic inhibitory strength, hyperexcitability can be part of an increased synchronization over a broader frequency range, linked to reduced spiking reliability (central neural gain⇓). This latter stage mutually reinforces diminished metabolic support for auditory adjustment processes, increasing the risks for canonical dementia syndromes.

Lien vers le texte intégral (Open Access ou abonnement)

10. Liu X, Kumar V, Tsai NP, Auerbach BD. Hyperexcitability and Homeostasis in Fragile X Syndrome. Frontiers in molecular neuroscience. 2021; 14: 805929.

Fragile X Syndrome (FXS) is a leading inherited cause of autism and intellectual disability, resulting from a mutation in the FMR1 gene and subsequent loss of its protein product FMRP. Despite this simple genetic origin, FXS is a phenotypically complex disorder with a range of physical and neurocognitive disruptions. While numerous molecular and cellular pathways are affected by FMRP loss, there is growing evidence that circuit hyperexcitability may be a common convergence point that can account for many of the wide-ranging phenotypes seen in FXS. The mechanisms for hyperexcitability in FXS include alterations to excitatory synaptic function and connectivity, reduced inhibitory neuron activity, as well as changes to ion channel expression and conductance. However, understanding the impact of FMR1 mutation on circuit function is complicated by the inherent plasticity in neural circuits, which display an array of homeostatic mechanisms to maintain activity near set levels. FMRP is also an important regulator of activity-dependent plasticity in the brain, meaning that dysregulated plasticity can be both a cause and consequence of hyperexcitable networks in FXS. This makes it difficult to separate the direct effects of FMR1 mutation from the myriad and pleiotropic compensatory changes associated with it, both of which are likely to contribute to FXS pathophysiology. Here we will: (1) review evidence for hyperexcitability and homeostatic plasticity phenotypes in FXS models, focusing on similarities/differences across brain regions, cell-types, and developmental time points; (2) examine how excitability and plasticity disruptions interact with each other to ultimately contribute to circuit dysfunction in FXS; and (3) discuss how these synaptic and circuit deficits contribute to disease-relevant behavioral phenotypes like epilepsy and sensory hypersensitivity. Through this discussion of where the current field stands, we aim to introduce perspectives moving forward in FXS research.

Lien vers le texte intégral (Open Access ou abonnement)

11. O’Connor RAG, van den Bedem N, Blijd-Hoogewys EMA, Stockmann L, Rieffe C. Friendship quality among autistic and non-autistic (pre-) adolescents: Protective or risk factor for mental health?. Autism : the international journal of research and practice. 2022: 13623613211073448.

Autistic young people are often misunderstood by non-autistic young people, and this can lead to difficulties in their friendships. We know that friendship is very important for our mental health. For non-autistic young people, having good friendships is linked to better mental health and having problems in friendship can cause mental health problems. This study aimed to compare the positive and negative features of friendship that autistic non-autistic young people experience. The study also aimed to understand if having positive or negative friendship features is related to signs of mental health problems (anxiety and depression). 306 young people aged 9-16 took part in this study. These were 86 autistic boys, 18 autistic girls, 91 non-autistic boys and 111 non-autistic girls. The findings of this study showed that autistic young people have less positive friendship features than non-autistic young people. For all young people in the study, having more positive friendship features was related to fewer signs of depression, while having more negative friendship features was related to more signs of depression. Just for autistic girls, having more positive friendship features was related to more signs of anxiety. These findings show that support is needed to help autistic young people have more positive friendships. For example, by teaching non-autistic young people how to be supportive friends to their autistic peers.

Lien vers le texte intégral (Open Access ou abonnement)

12. Rinaldi C, Attanasio M, Valenti M, Mazza M, Keller R. Autism spectrum disorder and personality disorders: Comorbidity and differential diagnosis. World journal of psychiatry. 2021; 11(12): 1366-86.

BACKGROUND: Differential diagnosis, comorbidities and overlaps with other psychiatric disorders are common among adults with autism spectrum disorder (ASD), but clinical assessments often omit screening for personality disorders (PD), which are especially common in individuals with high-functioning ASD where there is less need for support. AIM: To summarize the research findings on PD in adults with ASD and without intellectual disability, focusing on comorbidity and differential diagnosis. METHODS: PubMed searches were performed using the key words « Asperger’s Syndrome », « Autism », « Personality », « Personality disorder » and « comorbidity » in order to identify relevant articles published in English. Grey literature was identified through searching Google Scholar. The literature reviews and reference sections of selected papers were also examined for additional potential studies. The search was restricted to studies published up to April 2020. This review is based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses method. RESULTS: The search found 22 studies carried out on ASD adults without intellectual disability that met the inclusion criteria: 16 evaluated personality profiles or PD in ASD (comorbidity), five compared ASD and PD (differential diagnosis) and one performed both tasks. There were significant differences in the methodological approaches, including the ASD diagnostic instruments and personality measures. Cluster A and cluster C PD are the most frequent co-occurring PD, but overlapping features should be considered. Data on differential diagnosis were only found with cluster A and cluster B PD. CONCLUSION: ASD in high-functioning adults is associated with a distinct personality profile even if variability exists. Further studies are needed to explore the complex relationship between ASD and PD.

Lien vers le texte intégral (Open Access ou abonnement)

13. Simpson K, Clark M, Adams D. Profiles and predictors of thriving in children on the autism spectrum. Child: care, health and development. 2022.

BACKGROUND: Thriving is defined as the growth of attributes that mark a flourishing, healthy individual and include Competence, Confidence, Connectedness, Character, Caring and Contribution to self, family, community and civil society. Thriving has been linked to positive youth outcomes in neurotypical children and adolescents but has rarely been explored for individuals on the autism spectrum. METHOD: This study explored the profiles and predictors of parent-reported thriving in 111 school children on the autism spectrum, aged 6 to 14 years. RESULTS: Parents rated children as having relative strengths in the Caring and Connectedness dimensions and relative challenges in the Competence dimension. Stronger thriving outcomes were consistently predicted by stronger socialization scores; however, the other predictors of outcome differed by dimensions. CONCLUSION: The current findings provide insight into the individual and contextual factors that predict thriving in children on the autism spectrum. As research into thriving is in its infancy, more work is needed to understand how child, family and contextual factors relate to thriving in individuals on the autism spectrum to foster positive outcomes.

Lien vers le texte intégral (Open Access ou abonnement)

14. Spjut Janson B, Heimann M, Koch FS. Combining a Being Imitated Strategy With IBT Improves Basic Joint Attention Behaviors in Young Children With ASD. Frontiers in psychiatry. 2021; 12: 784991.

In the present study, we examined how an initial being imitated (BIm) strategy affected the development of initiating joint attention (IJA) among a group of children newly diagnosed with autism spectrum disorder (ASD). One group received 3 months of BIm followed by 12 months of intensive behavior treatment (IBT) which equaled treatment as usual whereas a second group received IBT for the entire 15-month study period. We utilized two measures of IJA: an eye gaze and a gesture score (point and show). IJA did not change during the first 3 months of treatment, nor were any significant between-group differences noted. However, at the end of the 15-month-long intervention period, the BIm group used eye gaze significantly more often to initiate joint attention. No significant change was noted for the gesture score. These results suggest that an early implementation of a being imitated strategy might be useful as less resource intensive but beneficial « start-up » intervention when combined with IBT treatment as a follow-up.

Lien vers le texte intégral (Open Access ou abonnement)

15. Steinbrenner JR, McIntyre N, Rentschler LF, Pearson JN, Luelmo P, Jaramillo ME, Boyd BA, Wong C, Nowell SW, Odom SL, Hume KA. Patterns in reporting and participant inclusion related to race and ethnicity in autism intervention literature: Data from a large-scale systematic review of evidence-based practices. Autism : the international journal of research and practice. 2022: 13623613211072593.

Researchers who study autism-related interventions do a poor job reporting data related to the race and ethnicity of autistic individuals who participate in their studies, and of those who do report these data, the participants are overwhelmingly White. This is problematic for many reasons, as we know little about how interventions are meeting the needs of culturally and linguistically diverse populations, and we assume that interventions are effective for all when they have been developed and validated primarily with and for White children. This study examined the reporting patterns of autism intervention researchers whose work was included in a large-scale systematic review of the intervention literature published between 1990 and 2017. We found that only 25% of studies (out of 1,013 included in the review) included data related to the race and ethnicity of their participants, with minimal change in reporting patterns across the years. In studies with reported data, White participants had the highest rate of participation, with a large gap between the next highest rates of participation among Hispanic/Latino, Black, and Asian participants. Other race and ethnicity groups had very low representation. This study includes additional analyses which examine how the reporting patterns and the inclusion of racially and ethnically diverse participants varies across study types, interventions, and outcome areas. Reporting this data is merely a starting point to begin to address the many disparities in autism-related healthcare, education, and research practices, and this article includes broader implications and next steps to ensure the field becomes more equitable and inclusive.

Lien vers le texte intégral (Open Access ou abonnement)

16. Sun JJ, Perera B, Henley W, Angus-Leppan H, Sawhney I, Watkins L, Purandare KN, Eyeoyibo M, Scheepers M, Lines G, Winterhalder R, Ashby S, De Silva R, Miller J, Philpott DE, Ashwin C, Howkins J, Slater H, Medhurst D, Shankar R. Epilepsy related multimorbidity, polypharmacy and risks in adults with intellectual disabilities: a national study. Journal of neurology. 2022; 269(5): 2750-60.

BACKGROUND: A quarter of people with Intellectual Disability (ID) in the UK have epilepsy compared to 0.6% in the general population and die much younger. Epilepsy is associated with two-fifths of all deaths with related polypharmacy and multi-morbidity. Epilepsy research on this population has been poor. This study describes real-world clinical and risk characteristics of a large cohort across England and Wales. METHODS: A retrospective multi-centre cohort study was conducted. Information on seizure characteristics, ID severity, relevant co-morbidities, psychotropic and antiseizure drugs (ASDs), SUDEP and other risk factors was collected across a year. RESULTS: Of 904 adults across 10 centres (male:female, 1.5:1), 320 (35%) had mild ID and 584 (65%) moderate-profound (M/P) ID. The mean age was 39.9 years (SD 15.0). Seizures were more frequent in M/P ID (p < 0.001). Over 50% had physical health co-morbidities, more in mild ID (p < 0.01). A third had psychiatric co-morbidity and a fifth had an underlying genetic disorder. Autism Spectrum Disorder was seen in over a third (37%). Participants were on median two ASDs and overall, five medications. Over quarter were on anti-psychotics. Over 90% had an epilepsy review in the past year but 25% did not have an epilepsy care plan, particularly those with mild ID (p < 0.001). Only 61% had a documented discussion of SUDEP, again less likely with mild ID or their care stakeholders (p < 0.001). CONCLUSIONS: Significant levels of multi-morbidity, polypharmacy and a lack of systemised approach to treatment and risk exist. Addressing these concerns is essential to reduce premature mortality.

Lien vers le texte intégral (Open Access ou abonnement)

17. Wall NG, Smith O, Campbell LE, Loughland C, Wallis M, Henskens F, Schall U. E-technology social support programs for autistic children: Can they work?. World journal of psychiatry. 2021; 11(12): 1239-46.

Autism is a neurodevelopmental condition with associated difficulties that present differently across individuals. One such difficulty is recognizing basic and complex facial expressions. Research has previously found that there are many evidence-based support programs available for building non-verbal communication skills. These programs are frequently administered with a therapist or in a group setting, making them inflexible in nature. Programs hosted on e-technology are becoming increasingly popular, with many parents supportive of them. Applications (apps) that are hosted on technology such as iPads or mobile phones allow users to engage in building skills in real-time social settings and own what they are learning. These technologies are frequently used by autistic children, with apps typically focusing on identifying facial features. Yet at this current time, there are mixed reviews of how to design such programs and what their theoretical backing is, with many studies using a mix of observation and psychological assessments as outcome measures. Eye-tracking and electroencephalography are established methodologies that measure neural processing and gaze behaviors while viewing faces. To better support the field moving forward, objective measures such as these are a way to measure outcomes of apps that are designed for helping children on the spectrum build skills in understanding facial expressions.

Lien vers le texte intégral (Open Access ou abonnement)

18. Xu YA, Naigles LR, Su YE. Early Word Order Usage in Preschool Mandarin-Speaking Typical Children and Children With Autism Spectrum Disorder: Influences of Caregiver Input?. Frontiers in psychology. 2021; 12: 766133.

This study explores the emergence and productivity of word order usage in Mandarin-speaking typically-developing (TD) children and children with autism spectrum disorder (ASD), and examines how this emergence relates to frequency of use in caregiver input. Forty-two caregiver-child dyads participated in video-recorded 30-min semi-structured play sessions. Eleven children with ASD were matched with 10 20-month-old TD children and another 11 children with ASD were matched with 10 26-month-old TD children, on expressive language. We report four major findings: (1) Preschool Mandarin-speaking children with ASD produced word order structures with pervasive ellipsis at similar rates to language-matched TD children, but also displayed differences from TD children in their usage of SVt and VtO frames; (2) Grammatical productivity was observed in both TD children and children with ASD; moreover, children with ASD with higher expressive language produced less stereotyped language; (3) Both TD children and children with ASD heard a range of word orders in their caregivers’ input, with TD children’s input greater in amount and complexity; however, caregivers of both groups also showed no age/language-related changes in word order usage; (4) Few word-order-specific correlations emerged between caregivers and their children; however, strong correlations were observed for mean length of utterances (MLU) for both groups: Caregivers who produced longer/more complex utterances had children who did the same. Taken together, it seems that despite their pragmatic deficits, the early grammatical knowledge of word order in Mandarin-exposed children with ASD is well preserved and in general follows the typical developmental pattern. Moreover, caregiver input is broadly rather than finely tuned to the linguistic development of TD children and children with ASD, and plays a more important role in children’s general syntactic development than in specific word order acquisition. Thus, early word order usage in preschool Mandarin-speaking TD children and children with ASD may be influenced by both caregiver input and child abilities.

Lien vers le texte intégral (Open Access ou abonnement)

19. Yamasue H, Kojima M, Kuwabara H, Kuroda M, Matsumoto K, Kanai C, Inada N, Owada K, Ochi K, Ono N, Benner S, Wakuda T, Kameno Y, Inoue J, Harada T, Tsuchiya K, Umemura K, Yamauchi A, Ogawa N, Kushima I, Ozaki N, Suyama S, Saito T, Uemura Y, Hamada J, Kano Y, Honda N, Kikuchi S, Seto M, Tomita H, Miyoshi N, Matsumoto M, Kawaguchi Y, Kanai K, Ikeda M, Nakamura I, Isomura S, Hirano Y, Onitsuka T, Kosaka H, Okada T. Effect of a novel nasal oxytocin spray with enhanced bioavailability on autism: a randomized trial. Brain : a journal of neurology. 2022; 145(2): 490-9.

Although intranasal oxytocin is expected to be a novel therapy for the core symptoms of autism spectrum disorder, which has currently no approved medication, the efficacy of repeated administrations was inconsistent, suggesting that the optimal dose for a single administration of oxytocin is not optimal for repeated administration. The current double-blind, placebo-controlled, multicentre, crossover trial (ClinicalTrials.gov Identifier: NCT03466671) was aimed to test the effect of TTA-121, a new formulation of intranasal oxytocin spray with an enhanced bioavailability (3.6 times higher than Syntocinon® spray, as assessed by area under the concentration-time curve in rabbit brains), which enabled us to test a wide range of multiple doses, on autism spectrum disorder core symptoms and to determine the dose-response relationship. Four-week administrations of TTA-121, at low dose once per day (3 U/day), low dose twice per day (6 U/day), high dose once per day (10 U/day), or high dose twice per day (20 U/day), and 4-week placebo were administered in a crossover manner. The primary outcome was the mean difference in the reciprocity score (range: 0-14, higher values represent worse outcomes) on the Autism Diagnostic Observation Schedule between the baseline and end point of each administration period. This trial with two administration periods and eight groups was conducted at seven university hospitals in Japan, enrolling adult males with high-functioning autism spectrum disorder. Enrolment began from June 2018 and ended December 2019. Follow-up ended March 2020. Of 109 males with high-functioning autism spectrum disorder who were randomized, 103 completed the trial. The smallest P-value, judged as the dose-response relationship, was the contrast with the peak at TTA-121 6 U/day, with inverted U-shape for both the full analysis set (P = 0.182) and per protocol set (P = 0.073). The Autism Diagnostic Observation Schedule reciprocity score, the primary outcome, was reduced in the TTA-121 6 U/day administration period compared with the placebo (full analysis set: P = 0.118, mean difference = -0.5; 95% CI: -1.1 to 0.1; per protocol set: P = 0.012, mean difference = -0.8; 95% CI: -1.3 to -0.2). The per protocol set was the analysis target population, consisting of all full analysis set participants except those who deviated from the protocol. Most dropouts from the full analysis set to the per protocol set occurred because of poor adherence to the test drug (9 of 12 in the first period and 8 of 15 in the second period). None of the secondary clinical and behavioural outcomes were significantly improved with the TTA-121 compared with the placebo in the full analysis set. A novel intranasal spray of oxytocin with enhanced bioavailability enabled us to test a wide range of multiple doses, revealing an inverted U-shape dose-response curve, with the peak at a dose that was lower than expected from previous studies. The efficacy of TTA-121 shown in the current exploratory study should be verified in a future large-scale, parallel-group trial.

Lien vers le texte intégral (Open Access ou abonnement)