Are ADHD traits dissociable from the autistic profile? Links between cognition and behaviour.
In children with ASD, poor inhibitory control flags ADHD traits, while theory-of-mind scores stay tied to social deficits.
01Research in Context
What this study did
The team asked if ADHD traits in kids with autism are just part of autism, or a separate pattern. They gave children with ASD two kinds of tests: stop-signal games for inhibitory control and false-belief stories for theory-of-mind. Parents also filled out rating scales about ADHD and ASD behaviors.
The goal was to see which test scores line up with ADHD impulsivity and which line up with ASD social problems.
What they found
Kids who had more ADHD traits also showed more ASD behaviors overall. But only poor inhibitory control predicted ADHD impulsivity. Theory-of-mind scores did not predict ADHD traits at all.
In short, inhibition is tied to ADHD, not to autism social deficits.
How this fits with other research
Billstedt et al. (2011) ran a near-copy study the same year and found the same split: inhibition separates ADHD from ASD, while theory-of-mind gaps fade as kids get older. The two papers act as direct replications.
Reus et al. (2013) extends the story by showing parents rate ASD symptoms higher when ADHD is also present, but direct classroom observations do not change. The 2011 lab result and the 2013 real-world rating fit together: extra ADHD traits inflate paperwork scores, not live social skill.
Berenguer et al. (2018) seems to disagree, claiming a ‘double-hit’ of combined EF and theory-of-mind deficits in ASD+ADHD. The clash is only on the surface: the 2018 study grouped kids by full diagnoses, while Keintz et al. (2011) looked at trait levels inside one ASD sample. Both can be true—separate traits can still co-occur at the severe end.
Why it matters
When you see high ADHD ratings in a child already diagnosed with ASD, do not assume the ASD is worsening. Check inhibition tasks like stop-signal or Stroop. If the child fails these, add ADHD accommodations such as movement breaks or shorter work periods instead of more social-skills drills. Meanwhile, keep theory-of-mind goals focused on true social deficits, not hyperactivity. This keeps your treatment plan precise and avoids stacking unnecessary hours.
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02At a glance
03Original abstract
Reports of co-morbid symptoms of ADHD in children with ASD have increased. This research sought to identify ADHD-related behaviours in a sample of children with ASD, and their relationship with the ASD triad of impairments and related cognitive impairments. Children with ASD (n = 55) completed a comprehensive cognitive assessment whilst a semi-structured parental interview (3Di) provided information on ASD and ADHD symptoms. Co-morbid presentation of ADHD traits in these participants was associated with reports of more ASD related behaviours. Inhibitory control performance was directly related only to the ADHD symptom of impulsive behaviour. In contrast, while there was a relationship between social difficulties associated with ASD and theory of mind ability, there was no such relationship with behaviours relating to ADHD.
Journal of autism and developmental disorders, 2011 · doi:10.1007/s10803-010-1049-0