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Autism Research: Official Journal of the International Society for Autism Research

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https://www.readbyqxmd.com/read/28448695/long-term-memory-in-older-children-adolescents-and-adults-with-autism-spectrum-disorder
#1
Diane L Williams, Nancy J Minshew, Gerald Goldstein, Carla A Mazefsky
This study extends prior memory reports in autism spectrum disorders (ASD) by investigating memory for narratives after longer recall periods and by examining developmental aspects of narrative memory using a cross-sectional design. Forty-seven older children/adolescents with ASD and 31 youth with typical development (TD) and 39 adults with ASD and 45 TD adults were compared on memory for stories from standardized measures appropriate for each age group at three intervals (immediate, 30 min, and 2 day). Both the youth with and without ASD had difficulty with memory for story details with increasing time intervals...
April 27, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28448694/the-joint-effect-of-air-pollution-exposure-and-copy-number-variation-on-risk-for-autism
#2
Dokyoon Kim, Heather Volk, Santhosh Girirajan, Sarah Pendergrass, Molly A Hall, Shefali S Verma, Rebecca J Schmidt, Robin L Hansen, Debashis Ghosh, Yunin Ludena-Rodriguez, Kyoungmi Kim, Marylyn D Ritchie, Irva Hertz-Picciotto, Scott B Selleck
Autism spectrum disorder is a complex trait with a high degree of heritability as well as documented susceptibility from environmental factors. In this study the contributions of copy number variation, exposure to air pollutants, and the interaction between the two on autism risk, were evaluated in the population-based case-control Childhood Autism Risks from Genetics and Environment (CHARGE) Study. For the current investigation, we included only those CHARGE children (a) who met criteria for autism or typical development and (b) for whom our team had conducted both genetic evaluation of copy number burden and determination of environmental air pollution exposures based on mapping addresses from the pregnancy and early childhood...
April 27, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28448681/autism-too-eager-to-learn-event-related-potential-findings-of-increased-dependency-on-intentional-learning-in-a-serial-reaction-time-task
#3
Fenny S Zwart, Constance W Th M Vissers, Roemer van der Meij, Roy P C Kessels, Joseph H R Maes
It has been suggested that people with autism spectrum disorder (ASD) have an increased tendency to use explicit (or intentional) learning strategies. This altered learning may play a role in the development of the social communication difficulties characterizing ASD. In the current study, we investigated incidental and intentional sequence learning using a Serial Reaction Time (SRT) task in an adult ASD population. Response times and event related potentials (ERP) components (N2b and P3) were assessed as indicators of learning and knowledge...
April 27, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28432743/global-and-local-visual-processing-in-autism-an-objective-assessment-approach
#4
Kritika Nayar, Angela C Voyles, Lynne Kiorpes, Adriana Di Martino
We examined global and local visual processing in autism spectrum disorder (ASD) via a match-to-sample task using Kanizsa illusory contours (KIC). School-aged children with ASD (n = 28) and age-matched typically developing controls (n = 22; 7-13 years) performed a sequential match-to-sample between a solid shape (sample) and two illusory alternatives. We tracked eye gaze and behavioral performance in two task conditions: one with and one without local interference from background noise elements. While analyses revealed lower accuracy and longer reaction time in ASD in the condition with local interference only, eye tracking robustly captured ASD-related global atypicalities across both conditions...
April 22, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28419785/internal-noise-estimates-correlate-with-autistic-traits
#5
Greta Vilidaite, Miaomiao Yu, Daniel H Baker
Previous neuroimaging research has reported increased internal (neural) noise in sensory systems of autistic individuals. However, it is unclear if this difference has behavioural or perceptual consequences, as previous attempts at measuring internal noise in ASD psychophysically have been indirect. Here, we use a "gold standard" psychophysical double-pass paradigm to investigate the relationship between internal noise and autistic traits in the neurotypical population (n = 43). We measured internal noise in three tasks (contrast perception, facial expression intensity perception, and number summation) to estimate a global internal noise factor using principal components analysis...
April 17, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28419777/micrornas-as-biomarkers-for-psychiatric-disorders-with-a-focus-on-autism-spectrum-disorder-current-progress-in-genetic-association-studies-expression-profiling-and-translational-research
#6
REVIEW
Yubin Hu, Erik A Ehli, Dorret I Boomsma
MicroRNAs (miRNAs) are a group of small noncoding RNA molecules, 18-25 nucleotides in length, which can negatively regulate gene expression at the post-transcriptional level by binding to messenger RNAs. About half of all identified miRNAs in humans are expressed in the brain and display regulatory functions important for many biological processes related to the development of the central nervous system (CNS). Disruptions in miRNA biogenesis and miRNA-target interaction have been related to CNS diseases, including psychiatric disorders...
April 17, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28419775/next-generation-sequencing-mitochondrial-dna-analysis-in-autism-spectrum-disorder
#7
Ashok Patowary, Ryan Nesbitt, Marilyn Archer, Raphael Bernier, Zoran Brkanac
Autism is a complex genetic disorder where both de-novo and inherited genetics factors play a role. Next generation sequencing approaches have been extensively used to identify rare variants associated with autism. To date, all such studies were focused on nuclear genome; thereby leaving the role of mitochondrial DNA (mtDNA) variation in autism unexplored. Recently, analytical tools have been developed to evaluate mtDNA in whole-exome data. We have analyzed the mtDNA sequence derived from whole-exome sequencing in 10 multiplex families...
April 17, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28401739/the-social-communication-questionnaire-for-adults-with-intellectual-disability-scq-aid
#8
Olivia Derks, Manuel Heinrich, Whitney Brooks, Paula Sterkenburg, Jane McCarthy, Lisa Underwood, Tanja Sappok
Autism spectrum disorder (ASD) frequently co-occurs with intellectual disability (ID) and often remains undiagnosed until adulthood. The Social Communication Questionnaire (SCQ) is a widely used measure to screen for ASD. To improve the utility of the SCQ for adults with ID, the aim of this study was to develop an ID-specific and adult appropriate algorithm for the SCQ using a core set of valid items. These items were identified in one sample (N = 226) and further cross-validated in a second, independent sample (N = 225) from Germany, England and the U...
April 12, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28401679/the-role-of-cholesterol-metabolism-and-various-steroid-abnormalities-in-autism-spectrum-disorders-a-hypothesis-paper
#9
REVIEW
Christopher Gillberg, Elisabeth Fernell, Eva Kočovská, Helen Minnis, Thomas Bourgeron, Lucy Thompson, Clare S Allely
Based on evidence from the relevant research literature, we present a hypothesis that there may be a link between cholesterol, vitamin D, and steroid hormones which subsequently impacts on the development of at least some of the "autisms" [Coleman & Gillberg]. Our hypothesis, driven by the peer reviewed literature, posits that there may be links between cholesterol metabolism, which we will refer to as "steroid metabolism" and findings of steroid abnormalities of various kinds (cortisol, testosterone, estrogens, progesterone, vitamin D) in autism spectrum disorder (ASD)...
April 12, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28401674/placebo-like-response-in-absence-of-treatment-in-children-with-autism
#10
Rebecca M Jones, Caroline Carberry, Amarelle Hamo, Catherine Lord
Caregiver report is the most common measure of change in pediatric psychiatry. Yet, placebo response rates pose significant challenges to reliably detect a treatment response. The present study simulated an eight-week clinical trial protocol for Autism Spectrum Disorder (ASD) for the purpose of testing the feasibility and validity of several outcome measures. Twenty caregivers answered questions about their child's behavior on their smartphone each week and completed a battery of paper questionnaires during weeks one and eight...
April 12, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28401654/is-there-sexual-dimorphism-of-hyperserotonemia-in-autism-spectrum-disorder
#11
Lauren C Shuffrey, Stephen J Guter, Shannon Delaney, Suma Jacob, George M Anderson, James S Sutcliffe, Edwin H Cook, Jeremy Veenstra-VanderWeele
Approximately 30% of individuals with autism spectrum disorder (ASD) have elevated whole blood serotonin (5-HT) levels. Genetic linkage and association studies of ASD and of whole blood 5-HT levels as a quantitative trait have revealed sexual dimorphism. Few studies have examined the presence of a sex difference on hyperserotonemia within ASD. To assess whether the rate of hyperserotonemia is different in males than in females with ASD, we measured whole blood 5-HT levels in 292 children and adolescents with ASD, the largest sample in which this biomarker has been assessed...
April 12, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28383189/maternal-hirsutism-and-autism-spectrum-disorders-in-offspring
#12
Brian K Lee, Stefan Arver, Linnea Widman, Renee M Gardner, Cecilia Magnusson, Christina Dalman, Kyriaki Kosidou
Because animal and human studies indicate that androgen exposure can influence neurodevelopment, it has been hypothesized that prenatal exposure to excess androgens may predispose to disorders with male-skewed ratio such as autism spectrum disorders (ASD). Therefore, maternal conditions characterized by hyperandrogenism such as polycystic ovary syndrome (PCOS) or hirsutism may be relevant to child ASD. We previously found in a large Swedish case-control study of 23,748 ASD cases and 208,796 matched controls that PCOS in mothers is associated with increased offspring risk of ASD...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28383173/the-childhood-autism-spectrum-test-cast-spanish-adaptation-and-validation
#13
Paula Morales-Hidalgo, Joana Roigé-Castellví, Andreu Vigil-Colet, Josefa Canals Sans
The Childhood Autism Spectrum Test (CAST; Scott et al. Autism 2002; 6:9-31) has proved to be a good test for screening autism spectrum disorders (ASD) and social communication problems. This study provides evidence on the statistical properties of the CAST, specifically its validity, factorial structure and discriminative capacity as an ASD screening test, in a Spanish sample of 4-12 year-old children from community and clinical settings. The study concludes that the test was valid and reliable for ASD screening in Spanish clinical and community populations and allowed us to create a new abbreviated version...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28383171/psychophysiological-responses-to-emotions-of-others-in-young-children-with-autism-spectrum-disorders-correlates-of-social-functioning
#14
Gemma Zantinge, Sophie van Rijn, Lex Stockmann, Hanna Swaab
Studying cognitive and affective mechanisms of social behavior could lead to identifying early indicators of derailing social behavior in young children with Autism Spectrum Disorders (ASD). The present study combined sensitive and objective techniques, such as eyetracking and psychophysiology, to provide insight into early neurodevelopmental mechanisms that are more difficult to uncover when relying on behavioral measures. Social attention towards faces and changes in affective arousal were investigated together in 28 young children with ASD (42-75 months) and 45 nonclinical controls (41-81 months)...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28383156/priority-service-needs-and-receipt-across-the-lifespan-for-individuals-with-autism-spectrum-disorder
#15
Jonathan K Y Lai, Jonathan A Weiss
Individuals with Autism Spectrum Disorder (ASD) have a range of health, community, and social support needs across the lifespan that create age-specific challenges in navigating service sectors. In this study, we set out to identify the priority needs of individuals with ASD across the lifespan, and the factors that predict receiving priority services. Participants included 3,317 individuals with ASD from a Canada-wide online caregiver survey, stratified into five age groups (preschool, elementary school age, adolescence, emerging adulthood, adulthood)...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28383150/assessment-of-presentation-patterns-clinical-severity-and-sensorial-mechanism-of-tip-toe-behavior-in-severe-asd-subjects-with-intellectual-disability-a-cohort-observational-study
#16
Giulio Valagussa, Luca Trentin, Valeria Balatti, Enzo Grossi
We assessed presentation patterns and characteristics of tip-toe behavior (TTB), more commonly known as toe walking, in a cohort of severe autism spectrum disorder (ASD) subjects with intellectual disability in two studies. The first study included 69 consecutive ASD subjects (57 males, mean age = 14 years-3.7 SD) under observation at our institute. A therapist assessed the presence of TTB during standing, walking, and running through direct observation and an interview with the subjects main caregiver...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28371531/infants-at-risk-for-autism-spectrum-disorder-patterns-of-vocalizations-at-14-months
#17
Dunia Garrido, Linda R Watson, Gloria Carballo, Rocio Garcia-Retamero, Elizabeth R Crais
Differences in the early development of children are crucial for early detection of autism spectrum disorder (ASD). Previous studies have shown large differences between children later diagnosed with ASD and their typically developing peers in the early use of canonical vocalizations (i.e., vocalizations that include well-formed consonant-vowel syllables) and the use of vocalizations for communicative purposes. In this prospective study, we examined the extent to which infant vocalizations at 14 months would predict Autism Diagnostic Observation Schedule (ADOS) diagnostic symptom groups, that is, Autism, Spectrum, and Non-ASD, for 82 community-identified at-risk infants at 23 months...
April 1, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28371523/latent-constructs-underlying-sensory-subtypes-in-children-with-autism-a-preliminary-study
#18
Brittany N Hand, Simon Dennis, Alison E Lane
Recent reports identify sensory subtypes in ASD based on shared patterns of responses to daily sensory stimuli [Ausderau et al., 2014; Lane, Molloy, & Bishop, 2014]. Lane et al. propose that two broad sensory dimensions, sensory reactivity and multisensory integration, best explain the differences between subtypes, however this has yet to be tested. The present study tests this hypothesis by examining the latent constructs underlying Lane's sensory subtypes. Participants for this study were caregivers of children with autism spectrum disorder (ASD) aged 2-12 years...
April 1, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28371492/i-tawt-i-taw-a-puddy-tat-gestures-in-canary-row-narrations-by-high-functioning-youth-with-autism-spectrum-disorder
#19
Laura B Silverman, Inge-Marie Eigsti, Loisa Bennetto
This study examined whether individuals with autism spectrum disorder (ASD) produce co-speech gestures similarly to typically developing (TD) peers. Participants were 20 youth ages 10-18 years with high-functioning ASD and 21 TD controls matched on age, gender, verbal IQ, and handedness. Gestures were elicited using a classic narrative-retelling task, in which participants watched a Tweety and Sylvester cartoon and retold the cartoon to a confederate. Analyses compared gesture rate, type, and viewpoint (character, observer, dual) across groups...
April 1, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28371413/auditory-spatial-attention-to-speech-and-complex-non-speech-sounds-in-children-with-autism-spectrum-disorder
#20
Laura N Soskey, Paul D Allen, Loisa Bennetto
One of the earliest observable impairments in autism spectrum disorder (ASD) is a failure to orient to speech and other social stimuli. Auditory spatial attention, a key component of orienting to sounds in the environment, has been shown to be impaired in adults with ASD. Additionally, specific deficits in orienting to social sounds could be related to increased acoustic complexity of speech. We aimed to characterize auditory spatial attention in children with ASD and neurotypical controls, and to determine the effect of auditory stimulus complexity on spatial attention...
April 1, 2017: Autism Research: Official Journal of the International Society for Autism Research
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