Autistic people & rules

Autistic people are often described as either indifferent to rules or overly rigid about them. Both descriptions miss something important.

In reality, many autistic adults relate to rules selectively. Some rules feel arbitrary and are ignored. Others are followed with great care.

Rules as guides, not absolutes

Many autistic adults do not experience rules as inherently authoritative. Instead, rules are often evaluated for their purpose.

• Does this rule improve safety?
• Does it reduce uncertainty?
• Does it make life easier or harder?

If a rule feels arbitrary or internally inconsistent, it may not carry as much weight. Rather than being automatically followed, rules are often evaluated for their function. They become one way of structuring behaviour, useful when they add clarity or safety, and unnecessary when they don’t.

This is why autistic people are sometimes seen as “breaking rules” while, at other times, following them with great precision. The deciding factor is whether the rule makes sense in context.

Critical thinking versus autopilot

Consider a pedestrian crossing at 1 a.m. The street is empty. The light is red. Some people will wait automatically, regardless of context. Others will cross without hesitation.

Many autistic adults pause to evaluate the situation:

• Is there actual risk?
• Is there enforcement here?
• What is the function of this rule right now?

Following the signal without thinking can feel like disengaging one’s own reasoning. Crossing safely when no cars are present may feel more rational than standing still simply because a light says so.

This is contextual reasoning. At the same time, context matters. If there are cameras nearby or the situation feels ambiguous, following the rule may suddenly make sense again, not because the rule has changed, but because the risk profile has.

Rules, routines, & cognitive load

Autistic nervous systems often process sensory and cognitive input more intensely. When everything requires conscious evaluation, fatigue accumulates quickly.

Routines reduce this burden. So do rules.

• Rules externalize decision-making
• That reduces uncertainty and cognitive load
• When that structure is removed, demand spikes
• The reaction is to the spike, not the rule

Why uncertainty increases cognitive effort

Recent research helps explain why rules, routines, and structured decision-making can feel so important for autistic people.

The Dual Process Theory of Autism suggests that autistic individuals tend to rely less on fast, intuitive processing and more on deliberate, analytical thinking. Intuition is rapid and automatic. Deliberation, by contrast, is slower and more effortful, and it is strongly influenced by uncertainty.

Large studies show that autistic traits are not, in and of themselves, associated with increased deliberation. Instead, this relationship is explained by intolerance of uncertainty—particularly a strong preference for predictability and knowing what will happen next. ^[1]Intolerance of Uncertainty Mediates the Relationship Between Autistic Traits and a Propensity for Deliberation (Brosnan et al., 2025)

In other words, autistic people are not inherently over-analytical. When uncertainty feels uncomfortable, deliberate reasoning helps regain predictability and reduce cognitive strain.

Decision-making under uncertainty

Other research on decision-making under uncertainty reinforces this pattern. ^[2]Autistic Adults Avoid Unpredictability in Decision-Making (Macchia et al., 2025)

When outcomes are unpredictable, decision-making can be uncomfortable for autistic people because uncertainty carries a higher cognitive cost. Autistic adults tend to avoid options with uncertain or ambiguous outcomes, even when those options may be more advantageous overall.

For example, imagine choosing between two job offers. One offers a clearly defined role, stable hours, and predictable expectations, but slightly lower pay. The other promises higher pay and future growth, but with vague responsibilities, shifting priorities, and unclear performance metrics.

Even if the second option may be objectively more advantageous, many autistic adults will gravitate toward the first because predictability reduces cognitive load and ongoing uncertainty.

Importantly, autistic and non-autistic participants do not differ in overall decision-making ability. The difference lies in how decisions are made, particularly when expectations or probabilities are unclear.
What can look like “risk aversion” is better understood as a preference for predictability.

When uncertainty becomes anxiety

Research on anxiety in autism further clarifies why rules, routines, and repetitive patterns can become so important. ^[3]The Relationships Between Restrictive/Repetitive Behaviours, Intolerance of Uncertainty, and Anxiety in Autism: A Systematic Review and Meta-Analysis (Bird et al., 2024)

Large-scale analyses show that autistic people are more likely to experience anxiety, and that this anxiety is closely linked to intolerance of uncertainty.

Restricted and repetitive behaviours often increase alongside anxiety, as stabilizing strategies that introduce predictability and reduce uncertainty.

Attempts to reduce rigidity without addressing anxiety and uncertainty risk removing coping strategies rather than supporting regulation.

Regulation, not pathology

Comprehensive reviews show that restricted and repetitive behaviours are adaptive and regulatory across development.^[4]Identifying the Functions of Restricted and Repetitive Behaviours and Interests in Autism: A Scoping Review (Lung et al., 2024)

More recent work shows that intolerance of uncertainty sits at the center of a broader stress cycle involving sensory sensitivity, repetitive behaviours, and worry.^[5]Autistic Sensory Traits and Psychological Distress: Mediating Role of Worry and Intolerance of Uncertainty (Recio et al., 2024)

When sensory input is intense or unpredictable, uncertainty increases. When uncertainty increases, worry escalates. Together, these processes amplify psychological distress.

This model helps explain why efforts to reduce rigidity without addressing uncertainty, worry, or sensory load often fail. Removing structure without reducing uncertainty increases distress rather than relieving it.

When correctness becomes a rule of its own

Some rule-following isn’t about external expectations at all, but about internal standards of correctness.

For example, someone may insist on precise language, formatting, or technical accuracy, correcting details that most people wouldn’t notice. This can be frustrating, even for the person doing it.

This insistence on correctness isn’t about perfectionism for its own sake. It’s about internal coherence. When systems make sense, the world feels more navigable.

Rules are tools

Autistic people do not follow rules because they are rigid by nature. They follow rules when rules serve a purpose.

Rules can:

• Increase predictability
• Reduce cognitive effort
• Support emotional regulation
• Create a sense of safety

They can also:

• Become burdensome
• Conflict with personal reasoning
• Create unnecessary stress

The key distinction is not whether rules are followed, but why.

Understanding this helps reframe rule-following as an adaptive response to a demanding environment.

A more accurate question

Instead of asking: “Why are autistic people so rigid about rules?”

A better question is: “What problem is this rule-following solving?”

Because in a world that already asks autistic people to process more, think more, and adapt more, rules are sometimes just a way to think a little less.

If you’re trying to untangle whether your “rigidity” is autism, anxiety, OCD, or burnout, the key question is always function: what is this behaviour protecting you from?

You can explore this further in our resources on intolerance of uncertainty, anxiety, and autistic burnout, including The Ultimate Guide to Autistic Burnout.