The concept of the autism “spectrum” has shaped how millions of people understand the condition for decades. New research now suggests that framing may be fundamentally misleading.
The word “spectrum” implies a single continuum, with autistic people differing mainly in degree. But researchers and clinicians are increasingly arguing that autism is not one condition with varying intensity — it is likely several distinct conditions grouped under a single diagnostic label. And the difference matters enormously for how autistic people receive support.
A Label That Covers Too Much Ground
Conor Liston, a neuroscientist at Weill Cornell Medicine in New York, describes autism as a large catch-all category that groups together “people with probably many different kinds of molecular, cellular and brain circuit mechanisms.” That biological diversity is now being studied with greater precision, as recent research identifies apparent subtypes within autism that are supported by distinct patterns of genes and brain activity.
The range of traits already visible at the surface level makes the problem clear. Some autistic people are nonverbal; others are highly articulate. Some experience acute sensitivity to light and sound; others do not. Some follow rigid daily routines and engage in repetitive movements, while others channel intense focus into specific interests, from Tudor history to Rubik’s cubes. Grouping all of these people under one diagnostic umbrella has always been a blunt instrument.
Adriana Di Martino at the Child Mind Institute in New York says the underlying goal of subtype research is earlier diagnosis and more personalised support. “Ultimately, that’s the goal,” she says.
Who Gets Diagnosed, and When
Autism diagnosis rates have risen sharply in recent years. Current estimates place the figure at 1 in every 32 people in the United States. That growth reflects, in part, a broader recognition that autism presents differently across groups — particularly among women and girls, who are frequently diagnosed later in life because their social behaviours and motivations have historically not been accounted for in diagnostic criteria.
Paul, a project manager from Maryland in his early 50s, is currently going through the diagnostic process. He says he struggles to read people who do not express themselves literally, yet that same trait has made him thorough and precise at work. It never occurred to him that he might be autistic until his therapist raised it. “I don’t think anybody fits all of this stuff,” he says.
His experience points to a broader pattern. Autism stereotypes have long shaped who gets identified, and when, leaving many people without answers for decades.
The Case for Subtypes, and Its Complications
The concept of an autism spectrum was first introduced by psychologists in 1979, and many autistic people still find it a useful framework. The growing drive toward subtyping, however, is not without tension.
Amy Pearson, a psychologist at Durham University in the UK, cautions that subtyping is not as neutral an exercise as researchers might assume. “You might feel like [subtyping] is value-neutral, but for someone else, it really isn’t,” she says. How subtypes are defined, named, and ultimately used by institutions and insurers carries real consequences for autistic people’s lives.
Liston frames the scientific case plainly: understanding autism’s heterogeneity is necessary to understand its biology. “There is now a more concrete basis for understanding where their experiences are coming from,” he says. Whether that biological precision translates into better outcomes depends on how the findings move from research into practice.
The science of autism subtypes is advancing. The harder work of ensuring those distinctions serve autistic people rather than complicate their access to support is still ahead.
Photo by Bioscience Image Library by Fayette Reynolds on Unsplash
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