Part 4 of a seven-part series asking whether the modern autism spectrum accurately describes the diversity of neurodivergent cognition. Has diagnostic simplification obscured meaningful neurological differences? Autism is now defined as a single spectrum in modern psychiatric manuals, replacing earlier distinctions such as Asperger’s syndrome. While this simplified diagnosis, it also collapsed multiple neurological profiles into one category. This article examines whether the spectrum model accurately reflects autistic diversity or obscures meaningful differences in cognition, support needs, and lived experience.

Contents

1. Introduction: A Question After Usefulness

The previous essays in this series explored how societies evaluate neurodivergent minds in terms of usefulness.

Historically, the concept appeared in unsettling ways. The category that would later become known as Asperger’s syndrome emerged in Nazi-era Vienna within a medical system that explicitly assessed human beings according to their perceived social value.

In modern societies, the same question appears in a different form. Industries built around complex systems, software, cybersecurity, engineering, and data science, often celebrate neurodivergent cognition for its analytical strengths.

Lived experience, however, reveals a more complicated reality. The same cognitive traits that make someone valuable in technical environments can also produce profound challenges in social contexts designed around different expectations.

Together, these perspectives raise a deeper question. If the experience of autism varies this widely, it raises another question: does the diagnostic framework we use actually describe that diversity accurately? If autistic cognition varies this widely, what exactly does the modern concept of the autism spectrum describe?

The challenge is not choosing between a spectrum and dozens of subtypes. The challenge is finding a framework that remains clinically useful while still reflecting the real diversity of autistic experience.

1.1 Series Overview

This short series explores the “question of usefulness” across seven perspectives: historical, social, personal, diagnostic, systemic, experiential, and constructive.

• Asperger’s Syndrome and the Question of Usefulness examines the historical origins of the diagnosis in Nazi-era Vienna and the uncomfortable context in which it emerged.
• Neurodiversity and the Question of Usefulness looks at how modern economies increasingly frame neurodivergent cognition in terms of its value to technical industries.
• Lived Experience and the Question of Usefulness reflects on what it means to live inside that dynamic, where certain cognitive traits are valued while the broader reality of neurodivergent experience often remains misunderstood.
• The Spectrum Problem after The Question of Usefulness examines whether the modern autism spectrum accurately reflects the diversity of autistic cognition, or whether diagnostic simplification has obscured meaningful differences in neurological profiles.
• We Still Don’t Understand Neurodivergent Minds Even Beyond the Question of Usefulness brings these perspectives together, exploring how the concept of usefulness continues to shape the conversation and arguing that meaningful inclusion requires changing environments rather than sorting or flattening different kinds of minds.
• When Autism Doesn’t Work: The Human Cost of the Question of Usefulness describes what that dynamic looks like from the inside when it does not work.
• Choose to Build Your Own Meaning Anyway: Beyond the Question of Usefulness explores what remains when usefulness fails as a framework, arguing that meaning must be constructed deliberately rather than assumed to emerge from success or inclusion.

Taken together, these essays explore a simple but important idea: that understanding neurodiversity requires looking not only at cognitive strengths, but also at the historical, social, human, and structural contexts in which those strengths are interpreted, and what follows when those frameworks break down.

2. The Spectrum Problem

Modern psychiatry describes autism as a spectrum. The intention behind this model was clear: to recognise that autistic traits vary widely in their expression and that rigid diagnostic boundaries between related conditions often failed to reflect clinical reality.

In practice, however, the autism spectrum now encompasses an extremely wide range of cognitive profiles.

Some autistic individuals are non-verbal and require lifelong support with daily living. Others live independently, pursue advanced education, and work in highly analytical professions. Some struggle primarily with sensory processing or emotional regulation, while others experience their most significant challenges in interpreting social signals or navigating complex interpersonal environments.

These differences are not simply variations in severity. In many cases they involve fundamentally different combinations of cognitive traits, strengths, and challenges.

The spectrum model solved one problem that existed in earlier diagnostic systems. Under previous editions of the DSM, categories such as Asperger’s syndrome, autistic disorder, and PDD-NOS often overlapped in confusing ways. Two clinicians could evaluate similar individuals and arrive at different diagnoses depending on how they interpreted those boundaries.

By collapsing these categories into a single spectrum, the DSM-5 aimed to simplify diagnosis and acknowledge the fluid nature of autistic traits.

Yet this simplification may also have introduced a new difficulty.

When a diagnostic category expands to include an extremely broad range of neurological profiles, meaningful distinctions can become harder to describe. Differences that once had names may appear flattened within a single overarching label.

This creates a familiar tension in scientific classification. Systems that attempt to describe complex biological realities often swing between two extremes: too many narrowly defined categories that create confusion, or overly broad categories that obscure important variation.

The autism spectrum may represent an attempt to find a balance between these extremes. But it also raises a fundamental question.

Are we describing one neurological condition expressed in many different ways, or several related neurodevelopmental profiles that have been grouped together under a single diagnostic framework?

3. The Collapse of Diagnostic Categories

In 2013, the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) replaced several previously distinct diagnoses with a single category: Autism Spectrum Disorder (ASD).

Before this revision, clinicians recognised multiple related conditions, including:

• Autistic disorder
• Asperger’s syndrome
• Pervasive developmental disorder – not otherwise specified (PDD-NOS)
• Childhood disintegrative disorder

The DSM-5 merged these into a single spectrum diagnosis.

The decision reflected several concerns within psychiatry. Researchers had long observed that the boundaries between these categories were often unclear in practice. Different clinicians sometimes assigned different diagnoses to individuals with similar traits.

Collapsing the categories was intended to improve diagnostic consistency, reduce confusion, and acknowledge the overlapping features across these conditions.

The result was the modern concept of autism as a single spectrum with varying support needs.

4. What the Spectrum Model Actually Means

The idea of a spectrum is often misunderstood.

In everyday conversation, people sometimes imagine autism as a simple line ranging from “mild” to “severe.” Clinical models are more complex than that.

Autism is typically understood as a condition involving differences across multiple dimensions, including:

• social communication
• sensory processing
• executive functioning
• cognitive style
• adaptive functioning

Individuals may vary widely across these domains. One person may have strong verbal abilities but struggle with sensory overload. Another may have profound communication challenges while demonstrating unusual strengths in visual or spatial reasoning.

The spectrum model attempts to capture this heterogeneity, the wide variation present within autistic experience.

Yet this same diversity raises an important question.

5. The Diversity Problem

The range of profiles included within the autism spectrum is unusually large.

Some autistic individuals are non-verbal and require lifelong care. Others live independently, pursue advanced education, and work in complex professions.

Some require extensive daily support. Others are able to navigate most aspects of life independently while managing invisible challenges.

These differences extend beyond support needs to cognitive style itself. Some individuals display extraordinary pattern recognition and analytical focus. Others struggle primarily with sensory regulation or emotional processing.

The result is a category encompassing people whose experiences of autism may differ dramatically.

This raises a legitimate scientific question:

Are these variations expressions of a single neurological condition, or are they multiple related profiles grouped together under a shared label?

6. A Scientific Debate

This question is not purely philosophical. In recent years, researchers studying autism genetics, neuroscience, and cognitive psychology have increasingly recognised that the condition may be far more heterogeneous than a single diagnostic label suggests.

Some studies point to multiple distinct developmental pathways leading to autistic traits. Others suggest that what is currently described as autism may represent several partially overlapping neurodevelopmental profiles rather than a single condition expressed along a simple continuum.

At present, the spectrum model remains the dominant clinical framework. Yet the growing recognition of this heterogeneity has led some researchers to ask whether future diagnostic systems may eventually move toward profiles or subtypes rather than a single umbrella category.

The debate remains open.

7. Asperger’s Syndrome as a Distinct Profile

Before the DSM-5 revisions, the diagnosis of Asperger’s syndrome described a particular cognitive pattern.

Individuals receiving this diagnosis often displayed:

• strong intellectual or analytical ability
• intense focus on specialised interests
• difficulty interpreting implicit social rules
• atypical communication styles
• unusual depth of engagement with systems or structured domains

For many people, the term Asperger’s provided a vocabulary for describing a very specific experience: the ability to analyse complex systems alongside persistent difficulty navigating social environments.

Although the label had problematic historical origins, it captured a pattern that many individuals still recognise in themselves.

When the category disappeared from diagnostic manuals, some welcomed the simplification. Others felt that a meaningful distinction had been lost.

8. The Risk of Diagnostic Flattening

Collapsing multiple diagnoses into a single spectrum creates certain practical advantages. It simplifies clinical classification and reduces confusion between overlapping conditions.

But simplification can also produce diagnostic flattening.

When highly diverse profiles are grouped together under a single label, differences that once helped explain lived experience may become harder to articulate.

Support needs can become less visible. Public understanding may become more confused. People whose experiences differ substantially may still find themselves described by the same diagnostic term.

For some individuals previously diagnosed with Asperger’s syndrome, this change created a sense that an important distinction had been erased rather than clarified.

9. The Politics of the Spectrum

The adoption of the spectrum model is not only a scientific decision. It is also connected to broader cultural debates about autism.

Within the neurodiversity movement, many advocates favour the spectrum concept precisely because it avoids hierarchical labels such as “high-functioning” or “low-functioning.”

These labels often oversimplified complex realities. Someone described as high-functioning might still struggle profoundly with emotional regulation or sensory overload. Someone described as low-functioning might possess abilities that conventional assessments failed to recognise.

The spectrum model attempts to move beyond such hierarchies.

Yet this shift introduces a tension.

Avoiding simplistic rankings is valuable. But collapsing diverse experiences into a single category may also obscure important differences between neurological profiles.

10. Masking and the Illusion of Functioning

The concept of masking complicates this issue further.

Many autistic individuals learn to consciously adapt their behaviour to match neurotypical expectations. This adaptation can involve monitoring tone of voice, rehearsing conversational responses, analysing social cues, and suppressing natural reactions.

From the outside, masking can create the appearance of seamless social competence.

Internally, however, the effort required to maintain that adaptation can be significant.

For individuals once diagnosed with Asperger’s syndrome, masking can produce the illusion of “high functioning” while concealing substantial psychological costs. Exhaustion, anxiety, and burnout are common consequences.

This dynamic illustrates the limits of simple functional labels.

What appears as mild autism externally may involve significant internal effort.

11. Double Empathy and Communication Differences

Modern research has also begun to challenge older assumptions about autistic communication.

Sociologist Damian Milton’s Double Empathy Theory proposes that communication difficulties between autistic and neurotypical individuals arise from differences in how both groups interpret social signals.

Rather than a simple deficit within autistic cognition, misunderstandings often emerge from reciprocal differences in perception and communication style.

This perspective reframes autism not as a failure of social cognition but as a divergence in how social information is processed.

If this interpretation is correct, the spectrum model may be describing a complex interaction between neurological differences and social environments rather than a single underlying condition.

12. What Might Replace the Spectrum?

The limitations of the spectrum model have led some researchers to explore alternative approaches.

Possible frameworks include:

• identifying distinct autism subtypes
• describing autism through dimensional profiles across multiple traits
• conceptualising autism as a cluster of related neurodevelopmental variations

At present, none of these alternatives has replaced the spectrum model.

The question remains open.

Autism may represent a single condition expressed in diverse ways. Or it may represent a family of related neurological profiles with overlapping characteristics.

Future research will likely continue to explore this possibility.

13. Inherent Vice: Tweaking the Spectrum

One risk in revisiting diagnostic distinctions is that the field may swing too far in the opposite direction. The history of psychiatric classification shows a recurring pattern: periods of increasingly detailed diagnostic categories are followed by efforts to simplify them. If autism were to be divided into numerous narrowly defined subtypes, the result could recreate the same confusion that led to the creation of the spectrum model in the first place.

The challenge, therefore, is not simply choosing between many categories and one broad spectrum. It is finding a framework that balances clinical clarity with the complexity of lived experience.

For clinicians, diagnostic categories must remain practical enough to guide assessment and treatment. For individuals, however, those categories also shape self-understanding and community identity. A useful model of autism must therefore do more than organise symptoms. It must help people understand both their differences and their place within a broader human landscape.

14. Conclusion: Beyond Simplification

The shift to a spectrum model simplified diagnosis and helped acknowledge the diversity present within the autistic experience.

Yet simplification can come with trade-offs.

When highly different cognitive profiles are grouped under a single label, important distinctions may become harder to recognise. Experiences that once appeared distinct may become blurred within a broader category.

Understanding autism requires navigating this tension between simplicity and complexity.

The challenge for future research is not simply to refine diagnostic labels, but to better understand the many ways human cognition can diverge from neurotypical expectations.

Because the diversity within autism may tell us something broader about the diversity of human minds themselves.

This question is explored further in: We Still Don’t Understand Neurodivergent Minds Even Beyond the Question of Usefulness.

The history of Asperger’s reminds us how societies once judged human worth through usefulness. Lived experience reminds us why that question still matters. The later articles explore what happens when that framework breaks down and what follows.

This article is part of a series:

1. Asperger’s Syndrome and the Question of Usefulness — Historical Origins
2. Neurodiversity and the Question of Usefulness — modern economic narratives
3. Lived Experience and the Question of Usefulness — personal realities
4. The Spectrum Problem after The Question of Usefulness — diagnostic frameworks
5. We Still Don’t Understand Neurodivergent Minds Even Beyond the Question of Usefulness — systemic perspective
6. When Autism Doesn’t Work: The Human Cost of the Question of Usefulness — how it feels from the inside
7. Choose to Build Your Own Meaning Anyway: Beyond the Question of Usefulness — constructive series finale

15. References

1. American Psychiatric Association. (2013). Diagnostic and Statistical Manual of Mental Disorders (DSM-5). APA Publishing.
2. Mottron, L. & Bzdok, D. (2022). Autism spectrum heterogeneity: fact or artifact? Molecular Autism.
3. Happé, F. & Frith, U. (2020). Annual Research Review: Looking back to look forward in neurodiversity. Journal of Child Psychology and Psychiatry.
4. Horkan, W. (2024). The Reduction of Diagnostic Categories in the DSM-5: Overlooking Important Distinctions.
   https://horkan.com/2024/07/27/the-reduction-of-diagnostic-categories-in-the-dsm-5-overlooking-important-distinctions
5. Horkan, W. (2025). Exploring the Interplay, Similarities, and Differences between Autism, Asperger Syndrome, and ADHD.
   https://horkan.com/2025/02/12/exploring-the-interplay-similarities-and-differences-between-autism-asperger-syndrome-and-adhd-comparing-them-to-neurotypicality-a-comprehensive-analysis
6. Horkan, W. (2025). Beyond Masking: The Other Forms of Camouflaging in AuDHD Lives.
   https://horkan.com/2025/07/09/beyond-masking-the-other-forms-of-camouflaging-in-audhd-lives
7. Horkan, W. (2025). Rethinking Autism: The Evidence Behind Milton’s Double Empathy Theory.
   https://horkan.com/2025/02/11/rethinking-autism-the-evidence-behind-miltons-double-empathy-theory
8. Horkan, W. (2025). Asperger’s Syndrome and the Skepticism towards Social Science: A Personal Perspective.
   https://horkan.com/2025/02/05/aspergers-syndrome-and-the-skepticism-towards-social-science-a-personal-perspective
9. Horkan, W. (2026). The Work Speaks for Itself.
   https://horkan.com/2026/01/02/the-work-speaks-for-itself