Executive Dysfunction, Rigid Thinking, and the Invisible Weight of Trying to Keep It Together
Have you ever missed one gym session and immediately thought, “Well, that’s it, the week is ruined”? Or stared blankly at your beautifully set-up planner while your brain went completely offline?
If so, you’re not lazy. You’re likely neurodivergent. And if you’ve been diagnosed with both autism and ADHD—like I have—you might be living with something called AuDHD. It’s not just a catchy mash-up of labels. It’s a real, researched co-occurrence of conditions that, when combined, create a very specific kind of chaos in your head. The kind that makes you genuinely believe you can’t start anything new on a Tuesday.
This isn’t just quirky. It’s clinical. And it’s exhausting. So today I want to share what’s really going on underneath the shutdowns, planner guilt, and invisible self-imposed rules. And I want to back it up with the science that helped me stop blaming myself—and start building systems that actually support my brain.
What Is AuDHD?
AuDHD is a term used to describe people who are both autistic and have attention-deficit/hyperactivity disorder. It’s more common than most people realise—research shows between 30% and 70% of autistic people also meet criteria for ADHD (Leitner, 2014).
That overlap creates a push-pull effect.
Autism craves structure, predictability, rules, and routines.
ADHD craves novelty, urgency, movement, and stimulation.
So what happens when your brain demands rigid structure and resists anything boring?
You end up with a nervous system in conflict. And when life doesn’t go to plan, you spiral. Fast.
Executive Dysfunction: Why Knowing Isn’t Doing
One of the most consistent features of both ADHD and autism is executive dysfunction. This is a neurological difficulty with initiating, planning, sequencing, and completing tasks—especially when those tasks aren’t immediately rewarding.
You can know what needs to be done. You can even want to do it. But you still can’t start.
That’s because your brain isn’t releasing enough dopamine or activating the pathways required to move from intention to action (Barkley, 2012; Volkow et al., 2009).
This is what happens when I miss a gym session or forget one item in my planner. My executive functioning tanks. I freeze. Then I beat myself up for being “lazy,” even though my brain was never wired to handle those steps easily in the first place.
Rigid Thinking: When the Rules Are the Rules
Let’s talk about one of the most misunderstood aspects of autism: rigid thinking. Clinically, this is known as cognitive inflexibility or set-shifting impairment. It’s the brain’s difficulty in adapting to changes in routine, adjusting plans, or shifting perspective once a mental rule or expectation is in place.
This isn’t about being stubborn or uptight. It’s a core cognitive trait of autism spectrum disorder, and research shows that it’s neurologically linked to differences in brain structure and function—especially in the prefrontal cortex, which governs decision-making, flexibility, and response inhibition (South et al., 2007; Yerys et al., 2009).
For me, rigid thinking looks like this:
- I have to start new routines on a Monday.
- If I miss Monday, the week is “broken” and I can’t start until the next Monday.
- If I planned to do something at 10:00 and I start at 10:15, I’ve “failed.”
- If my gym quota is 3x per week and I miss one, the whole plan is invalid.
And I know—rationally—that these rules are made up. I invented them. They exist only in my head.
But emotionally and neurologically, they feel very real. Because once a rule is set, my brain treats it like law.
In autism research, this is referred to as a deficit in cognitive flexibility—the ability to adapt behavior in response to changes in the environment or internal goals. In lay terms, it’s the mental version of trying to do a U-turn in a car without power steering: it’s slow, stressful, and often leads to stalling.
A key concept here is “set-shifting.”
Set-shifting is the process of mentally switching from one rule, task, or way of thinking to another. Autistic individuals often struggle with this, especially under stress or uncertainty. Instead of quickly adapting, our brains tend to double down on the current “set,” trying to maintain control.
Studies using the Wisconsin Card Sorting Test (a common cognitive test) show that autistic participants tend to perseverate—that is, keep using a rule even after it stops working (Geurts et al., 2009). The same thing happens in real life: we hold onto routines, expectations, and self-imposed rules long after they stop serving us—because letting go feels unsafe.
Here’s the twist: even when the rule is arbitrary, even when we created it ourselves, it becomes embedded. Breaking the rule doesn’t just feel like a change—it feels like losing control.
For me, when I try to reschedule something outside its “assigned slot,” my nervous system reacts like I’m being ambushed. My whole body tenses. My brain says, “It’s not supposed to happen this way.”
This isn’t about being dramatic or inflexible by choice. It’s about a brain that’s wired for predictability as safety. And any disruption to that predictability—no matter how small—triggers an internal alarm.
What the Research Says
- South, Newton, & Chamberlain (2012) found that autistic individuals consistently showed lower flexibility and higher distress when asked to change strategies or routines, particularly under time pressure or uncertainty.
- Yerys et al. (2009) used neuroimaging to show that autistic people demonstrate reduced activation in the brain regions responsible for cognitive control when asked to switch between tasks. This explains why even small shifts—like changing workout times—can feel overwhelming.
- Geurts et al. (2009) reviewed over a decade of research on executive functioning in autism and concluded that while not all autistic individuals show rigid thinking in the same way, it is a consistent cognitive profile across the spectrum.
What This Means for Me (and Maybe for You Too)
If you’re like me, and you find yourself panicking because your plan changed or you missed a start date—you’re not “overreacting.” You’re not silly. You’re reacting from a brain that’s designed to create order in a world that constantly feels disordered.
When I say, “I can’t start on a Tuesday,” I don’t mean that flippantly. I mean that my brain hasn’t emotionally or neurologically reconciled the idea that a new plan could start outside the “correct” framework.
So I’ve had to learn to be gentle with myself.
To build in flexibility on purpose.
And to recognise that what looks irrational from the outside is actually just how I stay regulated on the inside.
ADHD adds another layer of complexity to the already demanding landscape of neurodivergent routines. Where autism thrives on predictability and structure, ADHD craves novelty, movement, stimulation, and—most importantly—dopamine.
This conflict can become debilitating when it comes time to act. My autistic brain is committed to the plan. It wants to follow the rule. It says,
“Go to the gym. It’s in the planner. 7:00 AM. This is the routine.”
But my ADHD brain? It’s scanning for stimulation, risk-reward payoff, or social accountability. It says,
“The gym is loud, it’s repetitive, and honestly—there’s no dopamine in that. Want to reorganise the bookshelf instead? Or deep-dive into a new podcast? Ooooh, maybe research dog breeds for two hours!”
The result is paralysis. I’m stuck between a rule I can’t ignore and a brain that refuses to engage.
What Is ADHD Paralysis, Really?
What I’m describing is often referred to in everyday language as ADHD paralysis—the inability to begin a task, even when it feels urgent or important. Clinically, this falls under task initiation failure, a type of executive dysfunction.
This phenomenon is especially likely to happen when:
- The task is boring, repetitive, or complex
- The outcome is delayed or unclear
- There’s no immediate reward
- You’re already fatigued, emotionally dysregulated, or overwhelmed
This kind of cognitive stalling is deeply frustrating, especially because you still want to act. You may feel guilt, shame, or frustration, which further overwhelms the nervous system and reinforces the freeze.
It’s not a matter of motivation or discipline. It’s a neurological issue rooted in how dopamine and executive function systems work in the ADHD brain (Barkley, 2012; Brown, 2013).
The Neuroscience Behind the Freeze
Research shows that ADHD is characterised by dysregulation in the dopaminergic system, especially in the prefrontal cortex, which is responsible for planning, working memory, and goal-directed behavior. When dopamine levels are low—as they are during boring or non-urgent tasks—activation in this area drops off dramatically (Volkow et al., 2009).
This means that even if a task is important, the ADHD brain might not flag it as relevant unless there’s some form of:
- novelty
- urgency
- emotional engagement
- external accountability
This is why body-doubling (having someone nearby while you work), time pressure (a looming deadline), or interest-based projects suddenly make task initiation feel possible. They artificially spike your dopamine response and temporarily activate executive function pathways.
So What Happens in the Moment?
It looks like this:
- You know what to do
- You have time to do it
- You want to do it
- You physically cannot start
This moment of freeze—where everything inside your body tightens and nothing inside your brain fires—is ADHD paralysis.
It’s not procrastination. It’s not laziness. It’s executive shutdown.
It also explains why you might be able to deep-clean your kitchen for two hours instead of replying to one email. The kitchen task feels tangible and visually rewarding. The email doesn’t. Your brain picks what feels safest or most stimulating, regardless of urgency.
Why It’s Worse with AuDHD
When you combine ADHD with autism, the effect compounds.
Autism says: “You must do what you planned. Follow the schedule. No deviation.”
ADHD says: “But this task is boring. There’s no dopamine. I’m disengaging now.”
And you—living in the middle of both systems—get paralysed. You can’t adjust because of rigid thinking, and you can’t engage because of dopamine resistance. This is why neurodivergent burnout isn’t just about stress—it’s about cognitive systems in conflict.
What the Research Says
- Barkley (2012) describes ADHD as a disorder of self-regulation and delayed gratification, with impaired ability to prioritise and initiate future-focused actions.
- Brown (2006) found that individuals with ADHD show reduced connectivity in prefrontal regions that manage sequencing, shifting attention, and maintaining motivation for complex tasks.
- Volkow et al. (2009) confirmed via neuroimaging that dopamine transport dysfunction is directly correlated with motivational failure and task avoidance in ADHD brains.
- Tuckman (2015) outlined how executive dysfunction in ADHD leads to “preference-based action,” where we default to what’s stimulating instead of what’s scheduled.
Rejection Sensitivity: Shame Is the Spiral
That intense, overwhelming emotional crash I feel when I miss a plan? When I think I’ve disappointed someone, even if they’re totally fine? When I spiral for hours because I didn’t follow through perfectly?
That’s called Rejection Sensitivity Dysphoria (RSD).
RSD is a phenomenon experienced by many people with ADHD, where even the perception of rejection, criticism, or failure triggers a disproportionate and often debilitating emotional response. It’s not just “feeling bad” or “being sensitive.” It’s a neurological hypersensitivity to disapproval—real or imagined. And it hurts.
According to Dr. William Dodson (2017), one of the leading clinicians treating adults with ADHD, RSD can feel like “an emotional sunburn.” The smallest interaction—an unread message, a missed deadline, a slightly raised eyebrow—can trigger an overwhelming internal monologue:
- “I’ve disappointed them.”
- “They think I’m unreliable.”
- “I’m failing at being a good friend/partner/professional.”
- “Why do I always mess things up?”
And what makes it harder is that it often happens even when no one is upset. The rejection doesn’t have to be real. The fear alone is enough to activate the nervous system and throw me into shame, guilt, and sometimes full shutdown.
It’s Not the Gym. It’s the System
Here’s what I’ve realised, and it hit me hard: it’s never really about the gym. It’s about the system I’ve built around it.
Neurodivergent people don’t just use structure to be productive—we use it to feel stable. Planners, routines, calendars, timers—these aren’t just tools. They’re scaffolding that holds up our executive functioning, emotional regulation, and sense of control (Shalev et al., 2018).
So when I miss one block in that system, the entire thing can feel like it’s collapsing. It’s not the task that breaks me—it’s the loss of structure.
When Your Superpower Stops Working
Organisation has always been my thing. My autistic brain loves timelines, colour-coded layouts, and a clear sense of what’s next. It helps me feel calm. In control. Capable.
But when I’m stressed, overwhelmed, or burned out? That superpower disappears. I lose access to the very systems that keep me regulated.
This is called skills regression. It’s a recognised pattern in autistic individuals, where stress or burnout temporarily blocks access to previously reliable abilities—like planning, sensory regulation, or emotional control (Hull et al., 2020).
In ADHD, this pairs with task initiation issues. In AuDHD, it can lead to full-blown shutdowns or executive paralysis. And when you pride yourself on being the “organised one,” losing that skill feels like identity loss.
How I’m Rebuilding: Big Picture Thinking
Here’s what I’ve started doing to crawl my way out of the spiral:
- Zoom out. Ask: What’s the actual goal? Is it really “3 gym sessions”? Or is it nervous system regulation?
- Build flexibility into the plan. Walking with my son, swimming with my partner—those count too.
- Use visual tools that reflect real life. My planner now includes energy-based blocks, emotional check-ins, and built-in “off script” buffers.
- Permission over perfection. I include written permission slips for rest days, restarts, and chaos weeks.
- Use support, not shame. I still go to the gym with my trainer—but I’m working on not tying my worth to whether I show up.
Final Thoughts
If you’ve made up weird internal rules like “I can’t start on a Tuesday” or “If I miss one routine, I’m a failure,” please know: your brain is trying to protect you.
It’s not broken. It’s beautifully adapted to a world that doesn’t often understand it.
But you deserve systems that support your actual brain—not your fantasy self. You deserve routines that flex. Goals that adapt. And permission to start wherever you are, even if it’s Wednesday at 3:00 PM.
References
South, M. et al. (2012). Cognitive flexibility in autism spectrum conditions. Autism Research.
American Psychiatric Association. (2022). DSM-5-TR: Diagnostic and Statistical Manual of Mental Disorders.
Barkley, R. A. (2012). Executive Functions: What They Are, How They Work, and Why They Evolved.
Brown, T. E. (2006). Attention deficit disorder: The unfocused mind in children and adults. Yale University Press.
Leitner, Y. (2014). The co-occurrence of autism and ADHD in children—what do we know? Frontiers in Human Neuroscience, 8, 268.
Dodson, W. (2017). Rejection Sensitivity Dysphoria and ADHD. ADDitude Magazine.
Hull, L. et al. (2020). “Defining Autistic Burnout.” Autism in Adulthood.
Musser, E. D. et al. (2018). Emotional reactivity in ADHD: A meta-analysis. Journal of Abnormal Child Psychology.
Shalev, L. et al. (2018). Visual planning interventions and self-regulation in ADHD. Neuropsychology Review.
Tuckman, A. R. (2015). More attention, less deficit: Success strategies for adults with ADHD. Specialty Press.
Volkow, N. D., Wang, G.-J., Kollins, S. H., Wigal, T. L., Newcorn, J. H., Telang, F., Fowler, J. S., Zhu, W., Logan, J., Ma, Y., Pradhan, K., Wong, C. T., Swanson, J. M. (2009). Evaluating dopamine reward pathway in ADHD: Clinical implications. Journal of the American Medical Association (JAMA), 302(10), 1084–1091.
