# How Does Adult Temperament Relate to ADHD Symptom Domains? Testing the Dual-Pathway Model

## TL;DR

This study explores how adult temperament traits relate to ADHD symptoms and challenges the dual-pathway model by emphasizing self-regulation deficits.

## Contribution

The study challenges the dual-pathway model by showing that effortful control is a stronger predictor of ADHD symptoms than reactive traits.

## Key findings

- Lower effortful control was the strongest predictor of an ADHD diagnosis.
- Effortful control significantly influenced both hyperactivity/impulsivity and inattention symptoms.
- Surgency and negative affect had reduced effects after accounting for effortful control.

## Abstract

Temperament provides a valuable framework for understanding ADHD across the lifespan, as extreme temperamental traits are considered etiological risk factors. The dual-pathway model links specific temperamental traits to ADHD symptom domains: elevated reactive traits, surgency and negative affect, to hyperactivity/impulsivity, and a low regulatory trait, effortful control, to inattention.

One hundred fifty-eight adults (79 with clinical diagnoses of ADHD and 79 controls) filled in the Adult Temperament Questionnaire. Consistent with a compensatory extension of the dual-pathway model, it was hypothesized that effortful control would moderate the effects of reactive traits (surgency/negative affect) on hyperactive/impulsive symptoms and influence both ADHD symptom domains. For exploratory purposes, orienting sensitivity, an adult temperament factor related to perceptual sensitivity, was included in the analyses.

Binary logistic regression identified lower effortful control as the strongest predictor of an ADHD diagnosis. Negative affect had a significant but small effect, while surgency and orienting sensitivity were non-significant. Two hierarchical regressions were performed for self-rated symptoms of hyperactivity/impulsivity and inattention. Consistent with a compensatory model, effortful control was significantly related to symptom expression in both ADHD symptom domains. Contrary to expectations, surgency did not explain variance in hyperactivity/impulsivity, and the effect of negative affect was strongly reduced, after effortful control was added to the model. Effortful control did not moderate the effects of surgency and negative affect.

These findings challenge the dual-pathway model and highlight self-regulation deficits over reactive traits in sustaining ADHD in adulthood. They underscore the value of temperament-based approaches for refining diagnosis and developing targeted interventions for adult ADHD.