1. Brosnan M, Chapman E, Ashwin C. {{Adolescents with Autism Spectrum Disorder Show a Circumspect Reasoning Bias Rather than ‘Jumping-to-Conclusions’}}. {J Autism Dev Disord}. 2013 Sep 4.
People with autism spectrum disorders (ASD) often take longer to make decisions. The Autism-Psychosis Model proposes that people with autism and psychosis show the opposite pattern of results on cognitive tasks. As those with psychosis show a jump-to-conclusions reasoning bias, those with ASD should show a circumspect reasoning bias. Jumping-to-conclusions was assessed in a sample of 20 adolescents with ASD and 23 age-matched controls using the jumping-to-conclusions beads task. Both groups demonstrated equivalent levels of confidence in decision-making, however the ASD group required more beads than controls before making their decision. Furthermore, there was a positive correlation between the beads required and degree of autism symptoms. Consistent with the Autism-Psychosis Model, a more circumspect reasoning bias was evident in ASD.
Lien vers le texte intégral (Open Access ou abonnement)
2. Gu F, Chauhan V, Kaur K, Brown WT, Lafauci G, Wegiel J, Chauhan A. {{Alterations in mitochondrial DNA copy number and the activities of electron transport chain complexes and pyruvate dehydrogenase in the frontal cortex from subjects with autism}}. {Translational psychiatry}. 2013;3:e299.
Autism is a neurodevelopmental disorder associated with social deficits and behavioral abnormalities. Recent evidence suggests that mitochondrial dysfunction and oxidative stress may contribute to the etiology of autism. This is the first study to compare the activities of mitochondrial electron transport chain (ETC) complexes (I-V) and pyruvate dehydrogenase (PDH), as well as mitochondrial DNA (mtDNA) copy number in the frontal cortex tissues from autistic and age-matched control subjects. The activities of complexes I, V and PDH were most affected in autism (n=14) being significantly reduced by 31%, 36% and 35%, respectively. When 99% confidence interval (CI) of control group was taken as a reference range, impaired activities of complexes I, III and V were observed in 43%, 29% and 43% of autistic subjects, respectively. Reduced activities of all five ETC complexes were observed in 14% of autistic cases, and the activities of multiple complexes were decreased in 29% of autistic subjects. These results suggest that defects in complexes I and III (sites of mitochondrial free radical generation) and complex V (adenosine triphosphate synthase) are more prevalent in autism. PDH activity was also reduced in 57% of autistic subjects. The ratios of mtDNA of three mitochondrial genes ND1, ND4 and Cyt B (that encode for subunits of complexes I and III) to nuclear DNA were significantly increased in autism, suggesting a higher mtDNA copy number in autism. Compared with the 95% CI of the control group, 44% of autistic children showed higher copy numbers of all three mitochondrial genes examined. Furthermore, ND4 and Cyt B deletions were observed in 44% and 33% of autistic children, respectively. This study indicates that autism is associated with mitochondrial dysfunction in the brain.
Lien vers le texte intégral (Open Access ou abonnement)
3. Kotagiri P, Chance SA, Szele FG, Esiri MM. {{Subventricular zone cytoarchitecture changes in autism}}. {Developmental neurobiology}. 2013 Sep 3.
Autism is thought to be a neurodevelopmental disorder with symptoms developing during neonatal neurogenesis in the subventricular zone (SVZ). Autism associated genes alter SVZ proliferation and cytoarchitecture, yet the response of the human SVZ in autism is unknown. Epilepsy drives neurogenesis in rodents, but it is uncear how epilepsy interacts with autism in SVZ responses. The striatal and septal SVZ derive from separate lineages in rodents and generate different interneuron types. Yet it is unclear if autism unevenly regulates the striatal and septal SVZ. The human SVZ was immunohistochemically examined post-mortem from individuals with autism (n=11) and controls (n=11). Autism showed a lower cell density in the septal, but not striatal, SVZ hypocellular gap only in the absence of epilepsy. There was a decline in septal hypocellular gap cells with age in autism, but no correlation with age in controls. In contrast, PCNA+ cell numbers increased only in autism with epilepsy both in the hypocellular gap and in the ependymal layer on the septal but not striatal side. Ependymal cells also became GFAP immunoreactive in autism irrespective of epilepsy co-morbidity, however this only occurred on the striatal side. In examining these questions we also discovered a subset of ependymal, astrocyte ribbon and RMS cells which express PCNA and Ki67, PLP, and alpha-tubulin. These results are the first example of a neuropsychiatric disease differentially affecting the the septal and striatal SVZ. Altered cell density in the hypocellular gap and proliferation marker expression suggest individuals with autism may follow a different growth-trajectory. (c) 2013 Wiley Periodicals, Inc. Develop Neurobiol, 2013.
Lien vers le texte intégral (Open Access ou abonnement)
4. Marshall J, Hill RJ, Ziviani J, Dodrill P. {{Features of feeding difficulty in children with Autism Spectrum Disorder}}. {International journal of speech-language pathology}. 2013 Sep 3.
Parents of children with Autism Spectrum Disorders (ASD) commonly report concerns regarding feeding difficulties and poor nutrition. Feeding difficulties, in the form of undesirable mealtime behaviours and/or skill deficits, can cause parental concern and impact on family dynamics. Poor nutrition can have an impact on development and health outcomes. The purpose of this paper was to review recent research regarding feeding difficulties in children with ASD, in order to describe: (1) the most frequently reported undesirable mealtime behaviours and skill deficits; and (2) dietary intake and weight patterns as markers of nutrition. While the ASD population is a somewhat heterogeneous group, this literature review of 44 research studies identified a number of common issues for these children. Restricted dietary variety, food neophobia, food refusal, limiting diet based on texture, and a propensity towards being overweight were frequently reported. Gaining a better understanding of the common features of feeding difficulties experienced by children with ASD will assist in directing intervention studies. Findings from such studies have the potential to enhance developmental and nutritional outcomes for this group. Well-designed longitudinal research would be valuable in monitoring the impact of feeding difficulties for these children as they age.
Lien vers le texte intégral (Open Access ou abonnement)
5. Orellana LM, Martinez-Sanchis S, Silvestre FJ. {{Training Adults and Children with an Autism Spectrum Disorder to be Compliant with a Clinical Dental Assessment Using a TEACCH-Based Approach}}. {J Autism Dev Disord}. 2013 Sep 4.
The specific neuropsychological and sensory profile found in persons with autism spectrum disorders complicate dental procedures and as a result of this, most are treated under general anesthesia or unnecessary sedation. The main goal of the present study was to evaluate the effectiveness of a short treatment and education of autistic and related communication-handicapped children-based intervention program (five sessions) to facilitate a 10-component oral assessment in children (n = 38, aged 4-9 years) and adults (n = 34, aged 19-41) with autism spectrum disorder (with or without associated intellectual disability). The assessment ranges from entering into the examination room to the evaluation of the dental occlusion. There were statistically significant differences in the number of components reached and in compliance before and after the training program.
Lien vers le texte intégral (Open Access ou abonnement)
6. Siegel M, Milligan B, Stein H, Teer O, Smith KA. {{Telephone administration of the aberrant behavior checklist: A pilot study of feasibility in children with intellectual disability and autism}}. {Journal of intellectual disabilities : JOID}. 2013 Sep;17(3):265-71.
To advance clinical care and research in children with intellectual disability and autism there is a growing need for efficient means to measure behavioral severity and response to treatment. The objective of this study was to assess the feasibility of telephone administration of the Aberrant Behavior Checklist-Irritability Subscale (ABC-I). The ABC-I was administered by telephone to the primary caregivers of 39 subjects with intellectual disability and/or autism. The same primary caregiver of each subject was also mailed a written copy of the ABC-I with a self-addressed, stamped envelope. Scores obtained by telephone and written administration were highly correlated (r = 0.827, p < 0.001). Telephone administration of the ABC-I may be a feasible and efficient means of determining response to treatment in children with intellectual disability and/or autism, though these pilot findings need to be replicated in a larger sample.
Lien vers le texte intégral (Open Access ou abonnement)
7. Taylor JL, Mailick MR. {{A Longitudinal Examination of 10-Year Change in Vocational and Educational Activities for Adults With Autism Spectrum Disorders}}. {Developmental psychology}. 2013 Sep 2.
The transition from adolescence to adulthood has been shown to be a time of amplified risk for individuals with autism spectrum disorders (ASD). It is unknown, however, whether problems in educational attainment and employment in the years after high school exit represent momentary perturbations in development or a turning point with long-lasting effects throughout adulthood. The present study addressed this question by examining 10-year trajectories of vocational and educational activities for adults with ASD, as well as the personal characteristics and environmental resources that predicted these activities. Participants were 161 adults with ASD (ages 18-52 years at the start of the study; M = 30.9) who were part of a larger longitudinal study. Data were collected at 6 time points over a 10-year period. Results indicated significant declines in the level of independence and engagement in vocational/educational activities over the study period, particularly for women. Greater independence in vocational activities was found for those with more independence in activities of daily living. After controlling for personal characteristics, receipt of more services was marginally related to greater improvement in vocational independence. (PsycINFO Database Record (c) 2013 APA, all rights reserved).
Lien vers le texte intégral (Open Access ou abonnement)
8. Williams ME, Fink C, Zamora I, Borchert M. {{Autism assessment in children with optic nerve hypoplasia and other vision impairments}}. {Developmental medicine and child neurology}. 2013 Sep 3.
AIM: This study examined the utility of standard autism diagnostic measures in nine children (aged 5-9y) with severe vision impairment and a range of social and language functioning. METHOD: The Autism Diagnostic Observation Schedule (ADOS) and the Autism Diagnostic Interview, Revised (ADI-R) were systematically modified and used to assess symptoms of autism in children with vision less than or equal to 20/800, the majority of whom had optic nerve hypoplasia. The results of the assessments, including analysis of symptom patterns, were compared with expert autism diagnoses. RESULTS: Modified autism measures demonstrated good agreement with clinical diagnoses. Symptoms found to be most and least reliable in discriminating autism from behaviors common to most children with congenital vision impairment are described. Comparisons of current behavior with parent-reported behaviors from a younger age suggested that some symptoms of autism in very young children who are congenitally blind may improve with age. INTERPRETATION: The ADOS and ADI-R are useful for clinical assessment and for advancing research efforts to understand autism symptoms in children with vision impairment. However, some autistic symptoms in very young children may change over time, and developmental changes should be closely monitored.
