What being "on the spectrum" actually refers to
A diagnosis requires difficulties in two domains at once, not one. If the restricted and repetitive side is absent, the manual sends the clinician to a different diagnosis entirely.
We have not finished checking this source. No judgement either way. how we score evidence
Caveat on this rating: Citation provenance, stated plainly. The anchor is Volkmar and McPartland's peer-reviewed history of the autism diagnostic concept, which is the house-citable route for the DSM-III-to-DSM-5 timeline because DSM edition text is paywalled and the publisher's history page does not resolve. The quoted sentence is not from that review: it is verbatim from the American Psychiatric Association's own "Highlights of Changes from DSM-IV-TR to DSM-5" document, held on file and verified 2026-08-26, and it is attributed to the manual in the body rather than to the review. Diagnostic criteria are a definition, not a finding, so nothing here is evidence about causes, prevalence or what any individual has. The manual also states that people with a well-established earlier diagnosis keep it under the new category, which is why the 2013 change did not remove existing diagnoses.
"Spectrum" does not mean a dial running from slightly autistic to very autistic. It means two required domains, and a diagnosis needs both.
Significant findings
When the 2013 manual replaced four separate diagnoses with a single autism spectrum disorder, it also pinned down what that one diagnosis requires: differences in social communication and interaction, and restricted or repetitive behaviours, interests and activities.
Both are needed. The manual's own summary of the change says that "because both components are required for diagnosis of ASD, social communication disorder is diagnosed if no RRBs are present" - RRBs being that restricted and repetitive side. Someone who finds social situations exhausting and nothing else is describing something the manual routes elsewhere.
The criteria also require that the traits were present early in development and that they limit everyday functioning now. Severity is graded in three levels. That grading is what "spectrum" refers to - not how much of a common personality trait a person has.
Worth asking
If you recognise yourself in one domain and not the other, that is genuinely useful to know before going further, and it is exactly the kind of question an evaluation is built to answer.
Source
From Kanner to DSM-5: autism as an evolving diagnostic concept — Volkmar FR, McPartland JC (2014)
Read the source: https://doi.org/10.1146/annurev-clinpsy-032813-153710
DOI: 10.1146/annurev-clinpsy-032813-153710
How this was scored
- Study design
- not recorded
- Funding
- not recorded
- Published in
- not recorded
- Sample size
- not recorded
- Preregistered
- not recorded
- Conflicts disclosed
- not recorded
- Independent of proponent
- not recorded
- Retracted
- No
We have not finished checking this source, so there is no scoring to show yet. “We have not checked this yet” and “this is disputed” are different statements, so no scored band is shown rather than a low one.
Read the full scoring rubric, including what it can't tell you.
Published August 31, 2026.
Questions
How strong is the evidence behind this?
Resolv rates this source "not yet assessed". We have not finished checking this source. No judgement either way. One caveat travels with that badge: Citation provenance, stated plainly. The anchor is Volkmar and McPartland's peer-reviewed history of the autism diagnostic concept, which is the house-citable route for the DSM-III-to-DSM-5 timeline because DSM edition text is paywalled and the publisher's history page does not resolve. The quoted sentence is not from that review: it is verbatim from the American Psychiatric Association's own "Highlights of Changes from DSM-IV-TR to DSM-5" document, held on file and verified 2026-08-26, and it is attributed to the manual in the body rather than to the review. Diagnostic criteria are a definition, not a finding, so nothing here is evidence about causes, prevalence or what any individual has. The manual also states that people with a well-established earlier diagnosis keep it under the new category, which is why the 2013 change did not remove existing diagnoses. The score is calculated from recorded facts about the source — study design, funding, publication venue, sample size, preregistration — not typed in by an editor.
What is the source for this?
From Kanner to DSM-5: autism as an evolving diagnostic concept — Volkmar FR, McPartland JC (2014). DOI: 10.1146/annurev-clinpsy-032813-153710. The full source is linked on this page so you can read it yourself.
Is this medical advice?
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.