Judged in Seconds: Thin Slice Judgements and What They Mean for Our Neurodivergent Children

I want to start by being honest with you. I didn't find this research through an academic database or a journal alert. I found it because Pete Wharmby — autistic author, educator, and one of the most accessible voices in the neurodiversity space — shared a vlog about it on social media, and something in what he said made me stop scrolling and go looking for the source.

The paper itself is called "Neurotypical Peers are Less Willing to Interact with Those with Autism based on Thin Slice Judgments" — published in Scientific Reports in 2017 by Sasson et al. The title is clinical. The findings are quietly devastating. And the implications for neurodivergent children in schools — and for the adults who shape those children's days — are something I believe we all need to sit with.

So, what is a thin slice judgement?

You'll have experienced this even if you've never heard the term. It's that almost-instant sense you get about someone the moment you see them — before they've said a word, before you know anything about them as a person. Within seconds — sometimes just a glance — your brain has already made a judgement. Likeable. Awkward. Trustworthy. Someone I'd want to sit next to. Someone I'd avoid.

These micro-impressions are called "thin slice judgements," and they're not a character flaw or a sign of shallowness. They're how human brains work. They happen in all of us, automatically, beneath conscious awareness. They're shaped by pattern-recognition, social norms, and — crucially — by what we've been taught, implicitly or otherwise, to see as "normal."

What the research actually found

The researchers described this as "style, not substance" driving negative first impressions. Autistic communication differences — in prosody (the rhythm and tone of voice), facial expression, gaze, gesture, and body posture — were being read as "wrong" by neurotypical observers who didn't even know they were doing it.

Autistic people weren't saying anything that made people like them less. They were simply being autistic — and that alone was enough to shift how others responded to them.

What this means for children in school

This is where I want to pause, and ask you to really stay with what I'm about to say.

Think about a school corridor. A playground. A lunch hall. A classroom where children have to choose where to sit.

At every one of those moments, thin slice judgements are happening — fast, automatic, and largely unconscious. A neurodivergent child walks in. Perhaps their gaze is different. Perhaps they move differently, or their voice has a different quality, or they respond to a greeting in a way that doesn't quite match the expected social script. And in seconds, peers have already formed an impression that shapes whether they include, ignore, or exclude.

The research found these patterns in children and adults. It found them in same-age peers. It also found — and this is crucial for us to hold as professionals — that adults are not immune.

A teacher, a teaching assistant, a pastoral lead — all human beings with automatic impression-forming brains — may also be making split-second assessments of a neurodivergent child's behaviour, affect, and presence that then colour every subsequent interaction. Not out of cruelty. Not out of bad intent. But out of the same unconscious pattern-matching that all neurotypical (and many neurodivergent) brains do.

If a child is perceived as awkward or hard to connect with from the very first meeting, how might that shape the warmth of the relationship? How might it affect whether that child is given the benefit of the doubt? Whether their distress is read as "challenging behaviour" or as a child who is struggling?

The loneliness piece

One of the findings that stayed with me longest is this: in Study 2, autistic adults reported significantly higher levels of loneliness than their non-autistic peers. And crucially, the researchers also noted that autistic people don't generally want fewer relationships — they want connection just as much as anyone else. It's not that autistic people prefer to be alone. It's that barriers to connection exist — barriers that this research tells us are partly located not just in the autistic person, but in the responses of those around them.

For parents and carers, this is likely not news. You may have watched your child try — really try — to connect with a peer, only to be subtly rebuffed, left out, or quietly not included in the thing that everyone else got included in. This research offers one explanation for what you've been watching happen, and witnessing not being able to fix.

For neurodivergent adults reading this: if you have a lifetime of people moving away, of sensing that something about your presence triggers something in others, of friendships that never quite got off the ground — this research doesn't tell you that was your fault. It tells you something was happening in the room that you were never told about.

But it's not just "awareness" — it's what we do with this

The researchers were careful to note that this isn't a reason to try to make autistic people seem more neurotypical. Many autistic people are entirely comfortable in how they present themselves — and they should be. The answer is not to train the autism out of someone's voice or face or gaze in order to be more palatable to neurotypical observers.

What the research does argue for is this: if we want to improve social outcomes for autistic people, we need to do at least as much work on the side of the observers — building awareness, expanding what we consider to be normal, and creating the conditions where genuine familiarity can form over time.

In schools, this means whole-school approaches to neurodiversity that don't just give autistic children skills for surviving neurotypical spaces, but that also actively work on the understanding, bias, and social culture of the peers and adults around them.

In therapy rooms, it means being willing to examine our own automatic responses. Do we notice if we feel slightly less at ease with a particular client's presentation? Do we interrogate that, or do we act on it without questioning it?

And for all of us — it means sitting with a question that is uncomfortable but important:

Bullying, blame, and the wrong direction of change

There is a pattern in schools and workplaces that this research makes impossible to ignore. When a neurodivergent child or adult is being bullied, excluded, or treated unkindly, the response too often lands — whether explicitly or implicitly — on their shoulders. "Stop being so weird." "Try to fit in better." "You need to work on how you come across." The implicit message is clear: the problem is you, and you need to change yourself to become more tolerable to the people around you.

This is not just unhelpful. It is harmful. And this research gives us evidence for why.

If the judgements being made about neurodivergent people are happening automatically, beneath conscious awareness, within seconds — then asking a neurodivergent person to simply present differently, to mask harder, to flatten their natural way of being into something more neurotypically palatable — is asking them to wage a constant, exhausting war against themselves in order to manage someone else's unconscious bias. The burden of change is placed entirely in the wrong direction.

Bullying and social exclusion in schools need to be addressed at the level of the culture, not just the individual being targeted. That means having honest, age-appropriate conversations with neurotypical children about the automatic judgements their brains make — and about the difference between a first impression and a person. It means teaching that difference is not the same as wrong. It means creating classroom and playground cultures where "weird" is not an insult, where a different kind of presence is not a problem to be corrected, and where the responsibility to include does not fall entirely on the person who is already excluded.

In workplaces, the same principle applies. Neurodivergent employees are routinely told to adapt, to soften their communication, to present in ways that feel more comfortable to neurotypical colleagues — while the neurotypical colleague's comfort is treated as the unquestioned standard. Reasonable adjustments are a legal right, but genuine acceptance is a culture. One cannot substitute for the other.

The change that is needed is not "help the neurodivergent person seem less autistic." It is "help the people around them to look past a thin slice."

A note on language and framing

I want to be clear that in naming what this research found, I am not suggesting that autistic people are doing anything wrong. The differences in social presentation that triggered negative first impressions in observers are not deficits. They are differences — differences that exist because autistic neurology shapes communication differently, not worse. The problem documented in this research is not that autistic people present the way they do. The problem is the judgements made about them for it.

I also want to name that this research used fairly narrow samples — mostly white, intellectually capable adults and children. The experiences of autistic people of colour, autistic women, late-identified autistic people, and those with higher support needs may look different, and more research is needed across those intersections.

What I take from this, as a practitioner

As a therapist who is myself AuDHD, and as the parent of a demand avoidant AuDHD child, this research lands on multiple levels. I know what it is to walk into a room and feel something shift in the air. I know what it is to watch a child navigate a world that keeps quietly signalling that the way they are is a problem to be managed.

This research doesn't tell us anything that neurodivergent people haven't lived. But it does something important — it names it, evidences it, and locates it not just within the individual but within the dynamic between people. Social difficulty in autism, the researchers conclude, is not solely an individual impairment but a relational one. It takes two. And that means the responsibility for change cannot rest solely on the shoulders of autistic people and their families.

I don't know what brought Pete Wharmby to this research, or what sparked him to share it the way he did — I'm just glad that he did. Somewhere in that chain of creating, sharing, and going looking for more, something opened up for me. That's what I hope this post can be for someone reading it today.

Reference: Sasson, N. J., Faso, D. J., Nugent, J., Lovell, S., Kennedy, D. P., & Grossman, R. B. (2017). Neurotypical Peers are Less Willing to Interact with Those with Autism based on Thin Slice Judgments. Scientific Reports, 7, 40700. https://doi.org/10.1038/srep40700