A thought has been quietly nagging at one of us for a while, and we suspect that we are not the only neurodivergent people to have entertained it. The thought runs like this;

Perhaps a good deal of what our culture labels “psychopathy” actually describes a particular combination of more familiar neurodivergent ingredients.

You take autism, you add alexithymia, you add a body that seeks out internal sensation, and you stir in a generous measure of impulsivity. The result, viewed from the outside, can resemble the cold and calculating figure of psychopathy from popular imagination.

The idea tempts us because each ingredient corresponds to something real. The idea also turns out to be wrong in its strongest form, and the reasons it falls apart matter far more than the original hunch ever did. So, rather than abandon the thought quietly, we want to walk through it properly and together, because following it all the way to its conclusion reveals something genuinely important about how observers perceive Autistic people, how they misread us, and how that misreading causes real harm.

We write this piece in two voices and one argument. We agree on everything that matters, and between us we want to hold two truths at the same time. The overlap between psychopathy descriptors and neurodivergent experience represents one of the most dangerous diagnostic traps in the whole field; the answer, however, is not to swing so far in the opposite direction that we dismiss psychopathy as a construct or imply that anyone who presents with callous-unemotional traits must “really” be something else. That overcorrection would create its own kind of harm. The truth lives in the nuance, and the nuance, as we will argue throughout, lives in the ecosystem.

Where The Autism and Alexithymia Hunch Comes From

We should begin by treating the intuition fairly, because it does not rest on nothing. The overlap between autism and alexithymia is both real and substantial. Alexithymia describes a difficulty identifying and describing one’s own emotions, paired with an externally oriented thinking style, and it sits at the very centre of Autistic experience rather than at its edges. Estimates vary, yet researchers commonly cite figures in the region of forty to sixty-five percent, and “severe” alexithymia appears far more often within the Autistic community than in the general population (Kinnaird et al., 2019; Poquérusse et al., 2018). One systematic review and meta-analysis placed the prevalence at roughly fifty percent in Autistic groups, compared with around five percent in non-Autistic comparison groups (Kinnaird et al., 2019). This pattern represents one of the most robust findings in the entire area, and it reflects something structural rather than coincidental.

We need to be precise about what alexithymia actually is, because the precision changes everything. Alexithymia describes a difficulty accessing and naming emotion, and it does not describe an absence of emotion. The feeling is genuinely there, and sometimes it overwhelms the person entirely. The feeling simply cannot reach verbal processing, cannot reach outward expression, and frequently cannot even reach the person’s own conscious awareness in the moment. From the outside, an observer therefore sees flat affect, apparent unconcern, an absence of expected distress, and what looks like a failure to care. From the inside, a storm rages, and the storm cannot get out in any way that other people expect or recognise. One could be forgiven for seeing an overlap between the presentation of Autistic alexithymia and the flat and shameless affect of the psychopath.

This finding produced something even more significant. Bird and Cook (2013) proposed what researchers now call the “alexithymia hypothesis,” which argues that co-occurring alexithymia explains many of the emotional-processing difficulties that clinicians long assumed belonged to autism itself. This position carries real weight rather than fringe status; a growing body of work demonstrates that once researchers account for alexithymia, many of the supposed empathy “deficits” in Autistic people shrink dramatically or vanish completely. Difficulties that clinicians once treated as hallmarks of autism, including poor recognition of emotional facial expressions and atypical interoception, actually track with alexithymia rather than with autism (Cook et al., 2013; Shah et al., 2016).

This evidence reframes the cultural stereotypes about autism almost entirely. The familiar claims, that Autistic people lack empathy, that we struggle with emotional reciprocity, and that we cannot read or share feelings, turn out to describe alexithymia rather than autism, because alexithymia travels alongside autism while remaining a distinct experience (Poquérusse et al., 2018). The “severe” combination of alexithymia and autism has unfortunately become the cultural archetype that stands in for autism as a whole. Picture the fictional characters that most people reach for when they imagine an Autistic person, and you will usually find portraits of that specific “severe” co-occurrence rather than portraits of autism in general.

Milton’s double empathy problem (2012) takes this insight further and points us toward the argument that anchors this whole piece. The empathy gap runs in both directions at once; neurotypical observers fail to read and understand the Autistic person’s emotional world just as surely as the reverse, so what gets named as a “lack of empathy” usually describes a mismatch between two different ways of being rather than a moral absence inside one person. That distinction matters enormously, and it gives us the first clear sign that the failure to connect does not sit inside the Autistic person alone.

How Interoception And Sensory Seeking Mimic Psychopathy

We turn next to interoception, which describes your sense of what happens inside your own body, including your heartbeat, your hunger, your tension, and the physical signature of an emotion before you have named it. Interoceptive differences in how the body processes, integrates and understands its own internal signals appear commonly in Autistic people (Price & Hooven, 2018; Shah et al., 2016). When those signals arrive muted, distorted or simply hard to read, a person may not reliably know what they feel. Hunger and anxiety can register as the same sensation, excitement and dread can blur into one another, and pain can go under-registered until it becomes extreme.

These interoceptive differences can drive a pattern that researchers describe as interoceptive sensory seeking, in which a person needs strong, clear and intense bodily sensation in order to feel regulated, present and real. This drive can look like thrill-seeking, risk-taking, intensity in relationships, or a hunger for experiences that produce powerful physical sensation. The Hare checklist includes the item “need for stimulation and proneness to boredom”, which is exactly where the surface resemblance becomes dangerous. In interoceptive sensory seeking, however, the drive serves regulation rather than predation. Research also links differences in how people perceive and interpret internal bodily signals to the impulsive and behavioural dimension of psychopathy specifically, and that link sometimes expresses itself as over-reporting or hyper-vigilance toward bodily sensation rather than under-feeling it (Herman, 2023). The behaviours can look identical from the outside, yet the mechanisms underneath them differ.

Why Impulsivity Is Not The Absence Of Conscience

ADHD impulsivity adds another layer to the picture, and it springs from neurology rather than character, because it grows out of executive function differences, among other things (Barkley, 1997). The person acts before reflection catches up with them, and they act in this way instead of pausing rather than instead of caring. The caring frequently comes flooding back afterwards, and it arrives carrying shame, sometimes at a volume that becomes genuinely hard to survive. That sequence describes a nervous system doing its very best under conditions that it was never built to navigate without support, and it does not describe callousness.

Impulsivity does, admittedly, run through the research on the behavioural and antisocial facets of psychopathy as well, so we should acknowledge the overlap honestly. Different facets of psychopathy carry different impulsivity profiles, with sensation seeking sitting in one place and affective urgency sitting in another, and trait impulsivity attaches most strongly to the lifestyle and antisocial dimensions. The ingredient therefore appears on both sides of the ledger, and what separates the two is the system that sits underneath the impulsive act.

How PDA And Demand Avoidance Get Mistaken For Manipulation

We arrive next at PDA, which stands for pathological or pervasive demand avoidance depending on your preferred framing, and which involves an anxiety-driven need to resist perceived demands on personal autonomy (Christie, 2011; Egan et al., 2022). The nervous system experiences a demand as a threat, and it can respond with apparent defiance, with what looks like manipulation of social situations, with difficulty accepting accountability, and with rapid mood shifts. The Hare checklist includes both “conning and manipulative” and “failure to accept responsibility for one’s own actions,” so once again the surface descriptions line up in a way that should worry us.

A PDA response, however, springs from survival rather than calculation, and it carries no predatory intent whatsoever. The nervous system has hit a wall, and it does whatever it can to escape a perceived threat to its autonomy and its safety. That experience differs entirely from manipulating another person for entertainment or for personal gain while disregarding their inner world; the surface looks similar while the interior runs in the opposite direction.

Each individual ingredient in the original hunch therefore corresponds to something real and documented. That correspondence explains exactly why the idea feels so compelling; the trouble appears only when we try to add the ingredients together.

Where The Autism And Psychopathy Comparison Falls Apart

We now reach the central problem, and it carries real weight; the single most consistent finding that distinguishes autism from psychopathy concerns the kind of empathy involved, and the two profiles point in opposite directions from one another.

Researchers usually split empathy into two components. Cognitive empathy describes the ability to work out, infer and understand what another person thinks or feels, and it covers perspective-taking, theory of mind and the reading of a situation. Affective empathy describes the capacity to resonate with another person’s emotional state, to feel moved by it, and to feel a flicker of their distress inside yourself.

Autism tends to produce intact affective empathy alongside differences in cognitive empathy. Many Autistic people feel other people’s emotions intensely, and sometimes they feel them overwhelmingly, while they find the decoding and interpreting work harder, especially under pressure or across a neurotype gap, the feeling arrives reliably, and the read-out demands effort.

Psychopathy tends to produce broadly the reverse pattern. Its hallmark combines intact cognitive empathy, which often gives a very capable ability to infer and even exploit what others feel, with impaired affective empathy, which brings the diminished resonance, the reduced response to other people’s fear and distress, and the callous-unemotional core that defines the construct (Brook & Kosson, 2013). People high in psychopathic traits can frequently tell you exactly what you feel, while what falls silent in them is the experience of being moved by it.

“Add alexithymia and impulsivity on top of autism, and you do not arrive at psychopathy. You arrive at an Autistic person who carries alexithymia and acts impulsively, and whose intact emotional resonance still runs underneath everything, even when it stays hard to read from the outside.”

This contrast forms the crux of the whole matter rather than a minor technical caveat. The original equation, which treated psychopathy as autism plus a few extras, quietly assumed that the empathy difficulties in both profiles describe the same underlying thing in different clothing. They do not describe the same thing. The location of the empathy difference gives us arguably the clearest line that we have between the two profiles, and that line runs in opposite directions.

The neuroscience supports the same conclusion. The two profiles do share some structural features, because researchers have linked both to differences in the amygdala and in regions tied to social cognition, yet the broader neurobiological profiles remain largely non-overlapping, and the affective machinery looks different in each one (Blair, 2013). Reviews that have searched for genuine co-occurrence of autism and psychopathy generally conclude that the combination remains possible yet relatively rare, and they note that the picture grows complicated quickly, partly because our measurement tools cannot yet separate the constructs cleanly (Maguire et al., 2024; Murphy et al., 2024). When autism and conduct problems do appear together in the same child, the empathy difficulties tend to stay distinct and additive, so two separate mechanisms sit side by side rather than one becoming a flavour of the other (Maguire et al., 2024).

We should also clear up a historical red herring that has fuelled decades of confusion. Hans Asperger used the German phrase “autistischen Psychopathie,” which translates as “autistic psychopathy,” throughout his original descriptions in 1944, yet he meant something much closer to “autistic personality type”. His phrase carried essentially no connection to the modern construct of psychopathy, so the shared word represents a linguistic accident rather than evidence of a shared condition.

This blog series will continue with Part 2 which will be coming soon!