Differences in Executive Functioning in Children with Attention Deficit and Hyperactivity Disorder (ADHD).

Area of Science:

• Neuroscience
• Developmental Psychology
• Child Psychiatry

Background:

• Attention Deficit and Hyperactivity Disorder (ADHD) is frequently associated with working memory (WM) and executive function (EF) deficits.
• Understanding these cognitive differences is crucial for effective interventions in children with ADHD.

Purpose of the Study:

• To investigate executive functioning differences in working memory between primary school children with and without ADHD.
• To analyze specific EFs including divided attention, updating, attentional shifting, and inhibition.

Main Methods:

• A comparative study involving fourth-grade children diagnosed with ADHD (n=26) and typically developing (TD) children (n=29).
• Utilized rigorous tasks: dual-task paradigm (digits and box-crossing) for divided attention, N-Back task for updating, Trail Making Test for shifting, and Stroop task for inhibition.

Main Results:

• Children with ADHD demonstrated reduced verbal memory span and impairments in updating and attentional shifting compared to TD children.
• No significant difference in inhibition was observed between the ADHD and TD groups.
• Unexpectedly, children with ADHD showed less impairment than TD children on the divided attention dual-task paradigm.

Conclusions:

• ADHD is characterized by specific executive function deficits in working memory, particularly updating and attentional shifting.
• Inhibition appears to be less affected in this population, contrary to some expectations.
• The enhanced performance of children with ADHD on divided attention tasks warrants further investigation into attentional resource allocation.