Waiting for a diagnosis: what you can already understand now

Autistic Mirror (outside view, role parent)

The fact that there is no diagnosis yet does not change what is happening in your child's brain right now. The mechanism runs independently of it.

Your child's brain works with a system called predictive coding. It constantly compares what it expects with what actually happens. When both match, the system is calm. When they do not match, a so-called prediction error arises. In many autistic children, this system is calibrated so that deviations from expectation produce a stronger signal than in neurotypical children. A small change, for example a different cup at breakfast, a different order when getting dressed or an unfamiliar route, triggers a signal that feels like a real threat. Not dramatic, not exaggerated. Simply calibrated differently.

On top of this comes autistic inertia. Once a state has started, it is neurologically hard to switch, both an action and an inner expectation. The child has a picture of how the morning, lunch or the trip to nursery will look. This picture is active and being prepared. When reality deviates from it, the picture has to be discarded and a new one built. That genuinely costs energy, measurable in cognitive processing capacity, not in convenience.

In your case, at the age of four to six, another factor is involved: the child is in a phase in which demands from outside are rising. Nursery means more people, more unpredictability, more deviations from the expected routine. The child's nervous system carries a higher load during the day because it has less control over its environment at nursery. What you see at home are often the strong reactions to changes that reach the child when it is already exhausted. A rested nervous system often copes better with the same prediction error than one that has already been processing stimuli for hours.

So the child is not reacting to the change as such, but to the gap between expectation and reality. And this gap is real and large for its brain, even if it looks small from the outside.

Autistic Mirror (outside view, role parent)

Supermarkets are sensorily exceptionally dense environments: fridges hum, trolleys rattle, announcements come unexpectedly, people talk and move unpredictably, the light often flickers slightly, and smells arrive from different directions at the same time. For most people, the brain filters out most of this before conscious perception. This filtering process is called sensory gating. Stimuli are sorted out at a subcortical level, below consciousness, before they even reach the cortex. The brain learns: "This stimulus was already here, it is irrelevant, it goes no further."

In many autistic people, this sieve is more permeable. More raw material from all sensory channels at once lands on the processing level that is actually responsible for conscious, complex tasks. This is not a deficit in the sense of "broken", but a different calibration: the brain discards less in advance and processes more fully. In the supermarket this means concretely that the hum of the fridge is as present as your voice, the till two rows away as loud as the conversation right next to you, and the light as striking as the decision about which product to reach for.

This full processing is cognitively expensive. The brain of a child who is walking through the fruit section with you is at the same time busy sorting dozens of stimuli that never even arrive for others. This creates an exhaustion that shows in behaviour: crying, running away, freezing, clinging or outbursts in the shop or straight afterwards are not bad mood and not defiance. They are the visible result of a nervous system that has reached its capacity limit.

In addition, the supermarket is not predictable. Unfamiliar people come close, the route changes depending on queues and stock, and events like an announcement happen without warning. A brain that uses sensory gating less strongly relies especially on predictions to classify the stream of stimuli. What is announced can be prepared for. What comes as a surprise has to be processed fully and immediately, without warning.

The fact that your child is only four and still in the assessment process does not change this mechanism. The filter system is present or not, independently of a diagnosis.

Autistic Mirror (outside view, role parent)

The waiting is so exhausting because a great deal has changed in everyday life on the inside, even if everything has stayed the same on the outside.

Before the moment you started seriously asking yourselves whether your child is autistic, your perception of everyday life ran within a particular frame of interpretation. Behaviour had an explanation, even if that explanation was sometimes unsatisfying. Now two frames run at the same time: the old one and a new, not yet confirmed one. Every situation in everyday life is unconsciously processed twice. The child withdraws after nursery, and immediately the brain asks: is that a sign, or is it just tiredness? This is called an open prediction error. The brain keeps an expectation active, namely clarity about your child's situation, which has not yet been resolved, and the comparison between this expectation and what actually arrives keeps running permanently, even without you actively thinking about it. That costs capacity all the time.

On top of this, the diagnosis itself is a resource you do not yet have. It would open access to information, funding, adjustments at nursery, a vocabulary for conversations with others. You know that. And at the same time you have none of it in your hands. This creates a second kind of pressure: not the uncertainty about the child as a person, but the uncertainty about your own room for action. What are we allowed to raise? Can we inform the nursery teacher? Do we have the right to ask for support? These questions stay in limbo because the formal confirmation is missing, even though you see every day that your child experiences certain things differently.

The third strand is that many parents in this phase begin to re-evaluate past situations retrospectively. Moments that were simply moments suddenly become possible clues. This is not a loss of control, it is a very human attempt to create coherence. But it is effortful. The brain is working on a story that does not yet have an ending.

All of this happens while everyday life with a child aged four to six goes on, fully, loudly, demandingly.