At the time when autism spectrum disorder (ASD) can be first reliably diagnosed, toddlers affected by ASD are already displaying emotional vulnerabilities potentially foreshadowing the emergence of co-morbid affective and behavioral conditions highly prevalent in older children, reports a study published in the Journal of the American Academy of Child and Adolescent Psychiatry (JAACAP).
The authors found that toddlers with ASD display enhanced anger and frustration and decreased fear in response to naturalistic situations. They also found that the capacity to experience joy appears intact in the early stages of the disorder.
"ASD onsets in most cases within the first two years of life and affects approximately 1 in 59 children," said lead authors Suzanne Macari and Katarzyna Chawarska, PhD, at the Child Study Center at the Yale School of Medicine, New Haven, CT, USA. "This study documents, for the first time, that at the earliest age when the disorder can be reliably diagnosed, toddlers with ASD already display emotional vulnerabilities signaling risk for co-morbid affective and behavioral problems."
The findings are based on a study of emotional development in toddlers referred for a differential diagnosis of ASD in the Northeastern United States and includes 43 toddlers with ASD and 56 non-ASD controls.
Toddlers aged 21 months were recruited between December 2013 and March 2017. Using a multi-modal approach, the researchers examined intensity of emotional responses across vocal and facial channels to naturalistic situations aimed to elicit anger, fear, and joy.
"The vulnerabilities are unrelated to autism symptoms and thus, contribute independently to the development of complex and highly heterogenous autism phenotypes," added Drs. Macari and Chawarska. "In addition to targeting social and communication concerns, clinicians should also focus on assessing and treating affective symptoms in young children with ASD with the hope of ameliorating the severity of comorbid disorders so common in ASD."
The researchers found that when a desired object is put out of reach of the toddler, toddlers with ASD displayed elevated levels of intensity of anger and frustration. However, when faced with novel and potentially threatening objects, their fear intensity is lower than in the comparison groups. While an elevated anger response may challenge the developing emotion regulation system, the attenuated fear response suggests atypical appraisal of threat and risk for safety concerns.
Although there is a prevailing notion that children with ASD do not experience joy as much as other children, the study found that levels of joy in response to playful situations was comparable in toddlers with ASD and the control groups. This suggests that in the early stages of the disorder, the capacity to experience joy may be intact. Harnessing this intact emotional competence for therapeutic purposes is essential as activation of positive emotions promotes learning and exploration and counters stress. Together, the study reveals a surprising and complex emotional landscape of toddlers with ASD and provides strong motivation for investigation of early emotional development in ASD and its role in emergence of autism.
Notes for editors
The article is "Emotional Expressivity in Toddlers with Autism Spectrum Disorder," by Suzanne Macari, PhD, Lauren DiNicola, BA, Finola Kane-Grade, BA, Emily Prince, MS, Angelina Vernetti, PhD, Kelly Powell, PhD, Scuddy Fontenelle IV, PhD, Katarzyna Chawarska, PhD (https:/
Dr. Katarzyna Chawarska is Professor of Child Psychiatry, Pediatrics, and Statistics and Data Science and the Director of the Social and Affective Neuroscience of Autism Program at the Child Study Center, Yale School of Medicine. Her research focuses on identifying early markers of core and co-morbid symptoms in children with Autism Spectrum Disorder (ASD) and related conditions. She is also the Principal Investigator of the NIH Autism Center of Excellence Program focused on identifying neural signatures of ASD during fetal, neonatal, and school-age periods, on isolating cellular and molecular risk and protective factors for ASD, and on testing the efficacy of a novel intervention targeting an early marker of autism. She is the principal investigator on numerous federally and privately funded grants as well as the lead author on numerous publications and book chapters.
Copies of this paper are available to credentialed journalists upon request; please contact Mary Billingsley at email@example.com or +1 202 587 9672. Journalists wishing to interview the authors may contact Katarzyna Chawarska, PhD, Child Study Center, Yale School of Medicine, New Haven, CT, USA at firstname.lastname@example.org.
Journal of the American Academy of Child and Adolescent Psychiatry (JAACAP) is the official publication of the American Academy of Child and Adolescent Psychiatry. JAACAP is the leading journal focusing exclusively on today's psychiatric research and treatment of the child and adolescent. Published twelve times per year, each issue is committed to its mission of advancing the science of pediatric mental health and promoting the care of youth and their families.
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