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Definitions of Nonverbal and Minimally Verbal in Research for Autism: A Systematic Review of the Literature

Journal of Autism and Developmental Disorders volume 50, pages 2957–2972 (2020)Cite this article

Abstract

This systematic review examined definitions of “nonverbal” or “minimally verbal” and assessment measures used to evaluate communication in intervention studies focusing on improving expressive verbal communication in children with autism spectrum disorder (ASD). We reviewed sample size, number of participants, participant age, and male/female representation. Our analysis yielded relatively few studies with non/minimally verbal children with ASD focusing on verbal expressive communication. Further, we found large inconsistencies in measures used, definitions of “nonverbal” and “minimally verbal”, and ages targeted. Guidelines are suggested to create a more uniform assessment protocol with systematic descriptions of early communication learners as a foundational step for understanding the heterogeneity in this group and replicating research findings for this subgroup of children with ASD.

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Authors and Affiliations

  1. Department of Psychiatry and Behavioral Science, Stanford University School of Medicine, Stanford, CA, 94305, USA

    Lynn Kern Koegel

  2. Department of Hearing and Speech Sciences, Vanderbilt School of Medicine, Nashville, TN, 37205, USA

    Katherine M. Bryan, Pumpki L. Su & Stephen Camarata

  3. Koegel Autism Center, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA

    Mohini Vaidya

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  1. Lynn Kern Koegel
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Koegel, L.K., Bryan, K.M., Su, P.L. et al. Definitions of Nonverbal and Minimally Verbal in Research for Autism: A Systematic Review of the Literature. J Autism Dev Disord 50, 2957–2972 (2020). https://doi.org/10.1007/s10803-020-04402-w

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