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Developing a consensus research definition for profound autism using a modified Delphi method
Matthew Siegel1,2,3, Catherine L Lord4, Helen Tager-Flusberg5
1Boston Children's Hospital, Boston, MA, USA.
Molecular Autism
|July 1, 2026
Summary
A new research definition for Profound Autism (PA) was developed to improve studies on this high-needs autistic population. This consensus-based definition will enhance research comparability and intervention targeting for individuals requiring lifelong care.
Area of Science:
- Neuroscience
- Developmental Psychology
- Clinical Psychology
Background:
- Autism spectrum disorder (ASD) diagnosis has evolved, with recent focus on high-functioning individuals.
- Profound Autism (PA) is a proposed term for autistic individuals needing lifelong, 24/7 care.
- Inconsistent research criteria for PA hinder understanding of strengths and needs.
Purpose of the Study:
- To establish a consensus-based research definition for Profound Autism (PA).
- To improve clarity and comparability in research on high-needs autistic individuals.
- To facilitate targeted interventions and support for the PA population.
Main Methods:
- A systematic, multi-stage Delphi consensus study.
- Involved over 70 participants: researchers, caregivers, autistic individuals, and clinicians.
- Utilized a series of questions across primary domains of interest.
Main Results:
- 76% agreement on a research definition after two voting rounds.
- Definition includes: age (≥8 years), ASD diagnosis, adaptive functioning below age level, need for supervision, and severely impaired cognition/limited verbal communication.
- Criteria specify IQ < 50 and/or non-verbal communication limited to basic needs.
Conclusions:
- A new working research definition for Profound Autism is proposed.
- Adoption can enhance research comparability and generalizability of findings.
- Aims to better target interventions and support for this high-needs group.
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