16. April 2026

What Is Autism Spectrum Disorder? Rethinking Everything You Thought You Knew

By Dr. Priyal Ranasinghe, PsyD, MBA | Cedrus Counseling

You might be here because someone in your life, maybe your child, your partner, a close friend, or you yourself, has started to wonder about autism. Or you watched a video that hit close to home. Or you got a diagnosis last year and you're still trying to make sense of what it actually means, because the picture you're being handed doesn't quite match the picture in most people's heads.

Most of what the general public thinks it knows about autism is outdated, oversimplified, or outright wrong. The research has moved. The clinical understanding has moved. Autistic adults who have lived it and written about it have moved the conversation more than anyone. And yet the cultural image of autism, often a young white boy who doesn't speak much and lines up his toys, is still dominant enough to make a lot of autistic people (particularly women, adults, and people of color) feel like they can't possibly be autistic. They can. They are. Let me walk you through what we actually know.

Autism Is a Spectrum of Depth, Not a Dial From Mild to Severe

The word "spectrum" gets misused constantly. People hear it and picture a line, with "a little autistic" on one end and "very autistic" on the other. That is not what autism is.

A more accurate way to think about it: autism is a cluster of traits, and every autistic person has a unique profile of where those traits show up intensely and where they show up subtly. One person may have deep sensory sensitivities and a rich inner world but communicate verbally with ease. Another may speak only with a device and still have an extraordinary memory for pattern and detail. Think of it less like a volume knob and more like a fingerprint.

The Diagnostic Pillars (In Plain Language)

The current clinical guide, the DSM-5-TR, describes autism as having two core features that must both be present. The first is persistent differences in social communication and social interaction. The second is restricted or repetitive patterns of behavior, interests, or activities, which also includes sensory sensitivities. Both pillars have to be present for a clinical diagnosis, and they show up differently in every person.

Sensory Processing: Reality is subjective

Roughly nine in ten autistic people experience significant sensory differences, and for many, sensory load is the single biggest factor shaping how a day goes. A fluorescent light that hums just slightly, a shirt tag, the sound of someone chewing, the smell of a coworker's lunch, a crowded grocery aisle: these are not small annoyances for autistic brains, they are genuine input the nervous system is working harder to process and filter. Some people are hyper-responsive (input feels amplified), some are hypo-responsive (input has to be stronger to register), and many are both, depending on the sense and the day. Sensory overwhelm is not overreaction, and it is not something someone can push through indefinitely without cost.

Stimming, Special Interests, and Varied Presentations

Stimming (rocking, hand-flapping, humming, fidgeting) is not a problem to be solved. It is a self-regulating behavior that helps manage sensory input, express emotion, and stay grounded. Special interests are not obsessions. They are deeply rewarding topics that provide joy, regulation, identity, and expertise. A non-autistic hobby is something you pick up. A special interest picks you. Presentation also varies widely: some autistic people have co-occurring intellectual disability, some are non-speaking and use AAC devices, some are highly verbal but profoundly exhausted by interaction. "High-functioning" and "low-functioning" are labels that erase the person underneath them.

Monotropism: The Attention Style That Explains a Lot

One of the most useful frameworks to come out of autistic-led research is monotropism, proposed by Dinah Murray and colleagues. The idea is that autistic attention tends to flow strongly into one channel at a time, while neurotypical attention spreads across many channels in parallel. This explains the deep absorption in a special interest, the difficulty switching tasks, the sensory overload in environments that demand divided attention, and the way a single unexpected change can feel like the whole day has been knocked off its track. It is not a deficit. It is a different allocation of cognitive resources that comes with remarkable depth and the cost of reduced flexibility.

The Double Empathy Problem

The myth that autistic people lack empathy has been doing damage for decades, and the research does not support it. Damian Milton's double empathy problem reframes the issue: empathy breakdowns between autistic and non-autistic people go both ways. When autistic people communicate with other autistic people, rapport, understanding, and social fluency tend to go up, not down. That is not what a real empathy deficit looks like.

PDA: Persistent Drive for Autonomy

PDA, originally named Pathological Demand Avoidance by Elizabeth Newson in the UK, describes an anxiety-driven profile within autism where everyday demands (even ones the person wants to meet) can feel like a direct threat to autonomy. It shows up as avoidance, negotiation, distraction, or shutdown in response to small requests like "get dressed" or "answer this email." It is not defiance for its own sake. The autistic community has started reframing the acronym as Persistent Drive for Autonomy, which captures the experience from the inside: a nervous system that needs to feel in charge of itself to stay regulated. PDA is not yet a standalone DSM-5-TR category, but it is increasingly recognized in clinical and research settings.

A Strong Sense of Justice

A heightened commitment to fairness and moral clarity shows up often in autistic people, and justice sensitivity is now a documented area of research. It usually looks like: rules should apply the same way to everyone, hypocrisy is unbearable, and systems that do not make internal sense are exhausting to operate inside. This can make autistic people excellent advocates, researchers, and whistleblowers. It can also make everyday workplace politics or unspoken social hierarchies feel intolerable. What sometimes gets labeled as rigidity is often a refusal to pretend that something unjust is fine.

Co-Occurring Conditions and the Medication Myth

Autism rarely travels alone. Research consistently shows high rates of co-occurring ADHD (so common that the combined profile has its own name, AuDHD), anxiety, depression, OCD, PTSD, eating disorders, alexithymia, and sleep disturbance. Physical co-occurrences are also well documented: hypermobility and Ehlers-Danlos spectrum, POTS, chronic GI issues, and migraines. This is part of why evaluation matters, because what someone is struggling with is often several things at once.

There is a persistent myth that nothing in medicine can help autism. That is only half true. There is no pill that treats autism itself, and that is not the goal. But there are effective, well-researched medications that target the co-occurring conditions that often cause the most daily suffering: stimulants and non-stimulants for ADHD, SSRIs for anxiety and depression, sleep supports, and others. The FDA has also approved specific medications for autism-related irritability. The right clinical question is never "what drug cures autism," it is "what is making this life harder right now, and what helps."

Where to Go From Here

I want to leave you with this, not a conclusion but a small invitation. Notice where your attention flows most easily, where you lose track of time in a good way, where effort and outcome feel aligned. Those are your comparative strengths. Notice where the gap between effort and outcome is widest, where everyday environments cost you more than they seem to cost others. Those are your comparative vulnerabilities. Neither defines you. Both deserve honest attention.

Whether or not the word "autism" ends up fitting, the goal is not a label. The goal is a life that fits.