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ADHD subtypes: do they differ in their executive functioning profile?

Hilde M Geurts¹, Sylvie Verté, Jaap Oosterlaan

¹Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. h.m.geurts@uva.nl

Archives of Clinical Neuropsychology : the Official Journal of the National Academy of Neuropsychologists

|May 18, 2005

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This study found that children with Attention Deficit Hyperactivity Disorder combined subtype (ADHD-C) do not have generalized executive functioning deficits. ADHD-C and ADHD inattentive subtype (ADHD-I) also did not differ on executive functioning measures.

Area of Science:

Neuroscience
Child Psychology
Developmental Psychology

Background:

Theories suggest Attention Deficit Hyperactivity Disorder combined subtype (ADHD-C) involves generalized executive functioning (EF) deficits.
Research has not consistently differentiated ADHD subtypes based on EF profiles.

Purpose of the Study:

To investigate the executive functioning (EF) hypothesis in children with ADHD-C.
To determine if ADHD-C and ADHD inattentive subtype (ADHD-I) can be distinguished using EF measures.

Main Methods:

Compared 16 boys with ADHD-C and 16 with ADHD-I to 16 typically developing controls.
Assessed five executive functioning domains in matched participants (age, IQ, ODD/CD).

Main Results:

Related Experiment Videos

Children with ADHD-C showed deficits in inhibition but not across all EF tasks.
ADHD-C also exhibited non-EF task deficits.
No significant differences were found between ADHD-C and ADHD-I subtypes on EF measures.

Conclusions:

The findings do not support a generalized EF deficit hypothesis for ADHD-C.
Neuropsychological data did not provide evidence for distinct ADHD-C and ADHD-I subtypes based on the EF domains studied.