ADHD and context sensitivity

ADHD and autism overlap more often than their separate labels suggest. Both are rooted in variations in signal processing in the brain, and dual diagnoses are common. The diagnostic label says little about the unique person.

ADHD: attention pulled in multiple directions simultaneously — ADHD and attention regulation: all stimuli compete for attention with equal weight, making it hard to filter and prioritise.

Functional MRI studies have found clear similarities between ADHD and autism. Both trace back to differences in signal processing in the brain.

Overlap

Dual diagnoses (autism + ADHD) are common.
This makes sense: ADHD focuses on problems with attention regulation and concentration.
People with ADHD are more easily distracted by additional stimuli.
In autism, context processing itself is less integrated.

ADHD and autism also share a genetic basis. Large-scale register research shows a strong individual association between the two conditions, with a gradient across degrees of kinship — consistent with shared genetic predisposition. At the genomic level, both shared loci and differentiating loci have been described. The same building blocks can lead to autism or ADHD in different proportions.

Diagnosis preference

In practice, it appears that the diagnosis of ADHD is sometimes more easily accepted than autism.

ADHD is more often seen as something temporary or treatable.
Autism, on the other hand, sounds heavier and more permanent.

Still, both are variants in signal processing that can overlap strongly in some cases.

The classification says little about the unique person and their concrete strengths or vulnerabilities.

Context processing: two paths to the same problem

In autism, the core lies in implicit context processing: the social and semantic meaning of a situation is not automatically built up. Stimuli are processed in detail, but integration into a coherent whole is laborious.

In ADHD, the core lies in selection and prioritisation: which stimulus is relevant right now? The context filter does not work differently in style, but is unstable in weight — every signal can feel equally urgent.

An experimental distinction helps clarify this:

Proactive control is maintaining context over time: remembering a cue to guide a later response. In autism, this can be relatively strong — but holding context tightly also promotes rigidity when the situation changes.
Reactive control is adjusting when context changes. In ADHD, both proactive and reactive control are disrupted, and they do not correlate in ADHD as they do in typically developing individuals.

Additionally, sensory gating plays a role: an early neurophysiological gate that determines which information becomes available for higher context integration. In both autism and ADHD, this gate functions less effectively. Overload can thus arise before semantic or social interpretation even begins.

Network analyses show that autism and ADHD characteristics remain relatively separate as constructs, but that attention control forms the largest bridge between the two. This is precisely what the context-blindness model predicts: attention as a context filter is the shared vulnerability layer.

Note: This once again illustrates the limitation of DSM classifications. The label a person receives can depend on interpretation or even preference, while the underlying neurocognitive mechanisms largely overlap. The comorbid group — individuals with both autism and ADHD — moreover shows its own neurobiological profile that is not merely the sum of the two separate diagnoses. This makes single diagnostic labels even more limited.