Hyperactivity-impulsivity predicts curiosity — inattention drops out of the model
Hyperactivity and impulsivity as traits are typically framed as dysfunctions — restlessness, poor impulse control, difficulty waiting, etc. But new research from King’s College London suggests this framing misses something important. In a cross-sectional study of 521 UK adults, hyperactive-impulsive ADHD traits uniquely predicted higher trait curiosity. Inattention did not.
The study, published in BMC Psychology in April 2026 and led by Anne-Laure Le Cunff, measured ADHD traits using the Adult ADHD Self-Report Scale and curiosity using the Curiosity and Exploration Inventory-II. Just over half the sample (50.7%) had a formal ADHD diagnosis; the remainder were self-diagnosed or undiagnosed. The core finding held across all groups: hyperactivity-impulsivity correlated with curiosity whether or not the participant had ever received a diagnosis. The association is dimensional, not categorical.
This matters because it challenges the deficit model’s assumption that ADHD traits represent pure dysfunction. If the same neurology that produces impulsive behaviour also produces exploratory drive, the framing needs revision. The question becomes not how to suppress these traits but how to channel them.
The regression analysis controlled for age, gender, and education level. Hyperactivity-impulsivity emerged as the only ADHD symptom dimension that uniquely predicted curiosity (β = .26, p < .001). Inattention was not significant (p = .459). When each dimension was entered separately, both predicted curiosity — but in the combined model, only hyperactivity-impulsivity retained explanatory power. The inattentive dimension added nothing once the hyperactive-impulsive dimension was accounted for.
This is not a small effect buried in noise. The contingency analysis found that 41.6% of participants with elevated hyperactive-impulsive symptoms also scored in the high curiosity range, compared to 16.2% of those below the hyperactivity-impulsivity threshold. High curiosity was more than twice as prevalent among the hyperactive-impulsive subgroup. The pattern replicated across diagnostic groups. Running the regression separately within diagnosed/self-diagnosed participants and within undiagnosed participants produced the same result: hyperactivity-impulsivity predicted curiosity in both groups; inattention did not in either. The coefficient did not significantly differ between groups (z = 0.24, p = .809). Whatever is driving this association, it is not diagnosis-specific. It tracks the trait dimension itself.
Supplementary analyses tested robustness. Adding autism status and medication use as covariates did not change the pattern. Autism status was associated with lower curiosity (β = −.13, p = .002), confirming that co-occurring autism was not inflating the hyperactivity-curiosity association. A further robustness check removed conceptually overlapping items from both scales — the same pattern held. This is not construct overlap masquerading as correlation.
The two ADHD dimensions are themselves strongly correlated (r = .76), yet they diverge entirely in their relationship to curiosity. Inattention reflects difficulty sustaining focus and regulating attention. Hyperactivity-impulsivity reflects heightened behavioural activation and approach-oriented responses. Only the latter connects to the exploratory drive that curiosity captures.
Curiosity and impulsivity share dopaminergic reward circuitry
The mechanistic explanation is straightforward. Both curiosity and impulsivity recruit the same neural architecture: frontostriatal networks and midbrain dopamine inputs to the striatum and prefrontal cortex. The reward-sensitivity system that produces impulsive action also produces exploratory behaviour. They are not separate functions competing for resources. They are expressions of the same underlying system operating in different contexts.
Neuroimaging research supports this overlap. Curiosity states modulate hippocampus-dependent learning via dopaminergic circuits. The same pathways central to reward-driven behaviour in ADHD — the circuits implicated in the dopamine hypothesis of ADHD — are the circuits that drive curiosity. Heightened responsiveness to immediate rewards and a greater tendency to initiate action quickly are not bugs in the system. They are features that, in information-rich environments, manifest as exploratory drive.
The authors cite theoretical work proposing that curiosity and impulsivity may share a common motivational basis. Impulsive behaviour might be functional in unpredictable environments where access to resources is likely to be interrupted. Resolving uncertainty or gaining new information may be especially rewarding for individuals who are more driven by immediate, salient outcomes. From this perspective, the ADHD phenotype is not maladaptive in itself — it is mismatched to environments that punish rapid engagement and reward sustained monotony.
Hypercuriosity as impulsive exploration rather than distractibility
Le Cunff’s 2024 theoretical paper in Evolutionary Psychological Science introduced “hypercuriosity” as a framework for understanding how impulsivity and exploration interrelate. Hypercuriosity is defined as an intensified and difficult-to-inhibit desire to explore and seek information — characterised by frequent attentional shifts toward novel stimuli and, in some contexts, deep absorption when curiosity is strongly engaged.
The current empirical findings are consistent with this framework. If hypercuriosity involves heightened responsiveness to stimulation combined with reduced inhibitory control, then hyperactive-impulsive traits should predict curiosity — and they do. The contingency analysis showing that high hyperactivity-impulsivity and high curiosity cluster together at the distributional tails is exactly what hypercuriosity theory would predict.
This reframes what is typically called distractibility. The rapid attentional shifts that frustrate teachers and employers are not failures of the attention system. They are the attention system doing what it evolved to do: scanning for salient information, engaging quickly, and moving on when novelty diminishes. The problem is not the mechanism. The problem is the environment demanding sustained attention to low-novelty material.
Qualitative research consistently finds that adults with ADHD describe curiosity as both a strength and a challenge. It fuels deep engagement in areas of interest while complicating task prioritisation and producing impulsive information-seeking. The present study provides quantitative confirmation: hyperactive-impulsive traits — not ADHD diagnosis, not inattention — predict this pattern.
The Curiosity and Exploration Inventory-II measures two dimensions: “stretching” (motivation to seek out knowledge and new experiences) and “embracing” (willingness to engage with novelty, uncertainty, and unpredictability). Both correlated with hyperactivity-impulsivity. The association is not limited to thrill-seeking or sensation-seeking. It extends to epistemic curiosity — the drive to understand.
The same traits framed as deficits underpin engagement and learning
The deficit model positions hyperactivity-impulsivity as something to manage, medicate, or accommodate. This study suggests that framing is incomplete. The same traits associated with regulatory difficulties are also associated with curiosity — a trait linked to learning, creativity, and exploration. Whether hyperactivity-impulsivity manifests as a problem or a resource depends on context.
In constrained environments, the same tendencies that produce restlessness might, under conditions that allow exploration, translate into deeper intellectual engagement. The authors note that behaviours such as rapid task-shifting, frequent questioning, or seeking stimulation may clash with classroom expectations for sustained focus on routine material. But these are not inherently dysfunctional behaviours. They are behaviours that become dysfunctional when environments do not accommodate them.
This has practical implications. Teaching, coaching, career guidance, and workplace design could leverage curiosity rather than suppress it. Learning environments that offer autonomy, novelty, or opportunities for exploration may improve engagement for individuals with ADHD — not by compensating for deficits but by aligning with existing strengths. The study did not examine functional outcomes directly, but it provides a foundation for intervention research that does.
The implications extend to identity and self-perception. People with ADHD are frequently exposed to stigma and negative stereotypes. Internalised stigma is associated with lower self-esteem, greater functional impairment, and poorer quality of life. Recognising that hyperactive-impulsive traits relate to exploratory drive and curiosity — not only to challenges — may support a more positive sense of identity. Viewing curiosity as a motivating force rather than a source of distraction shifts the frame from deficit to difference.
The study has limitations. It is cross-sectional, so causal direction cannot be established. All measures were self-reported. The sample was predominantly female, White, and highly educated. But the large sample, validated dimensional measures, and convergence across analytic approaches support the reliability of the core finding. Hyperactivity-impulsivity predicts curiosity. Inattention does not. The deficit model needs revision.
Citations
Le Cunff, A.-L., Russell, C., & Dommett, E. J. (2026) — Hyperactive–impulsive ADHD traits predict higher curiosity in adults: evidence from a cross-sectional study
