The Emergence of Autism Symptoms Prior to 18-Months of Age: A Systematic Literature Review

Amy Tanner, Katerina Dounavi

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Pre-diagnostic intervention for autism spectrum disorder (ASD) allows symptoms to be addressed as they emerge, often between six to 18 months, rather than after the full onset of the disorder. A systematic literature review, spanning the previous six years was conducted in order to provide an updated review looking at the earliest behavior symptoms of ASD. All included studies used a prospective experimental design, reported on symptoms that emerged before 18-months of age, exclusively in children who would later receive a diagnosis, and were assessed for quality. This review is the first to address this research question through the use of a systematic research design and extends the literature by following up on recommendations for future research from previous findings.
Original languageEnglish
JournalJournal of Autism and Developmental Disorders
Early online date30 Jul 2020
Publication statusEarly online date - 30 Jul 2020


  • Autism spectrum disorders
  • Early behavioral symptoms
  • Systematic literature review
  • Early screening

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  • Student Theses

    Using Parent-Mediated Intervention to Treat Autism Symptoms in Infants

    Author: Tanner, A., Dec 2020

    Supervisor: Dounavi, A. (Supervisor) & Dillenburger, K. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy


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