Interference control in attention-deficit/hyperactivity disorder: differential Stroop effects for colour-naming...

Area of Science:

• Cognitive Psychology
• Neurodevelopmental Disorders
• Clinical Psychology

Background:

• Cognitive theories suggest attention-deficit/hyperactivity disorder (ADHD) involves deficits in interference control.
• Previous research on ADHD and interference control using the Stroop task has yielded inconsistent findings, potentially due to methodological limitations.

Purpose of the Study:

• To investigate interference control in children with ADHD using computerized Stroop tasks.
• To examine the impact of stimulus properties and calculation methods on interference scores.
• To differentiate between speed and accuracy measures in assessing Stroop performance.

Main Methods:

• Employed two computerized Stroop tasks (Colour-Stroop and Counting Stroop) allowing for separate speed and accuracy calculations.
• Included 14 children diagnosed with ADHD (combined type) and 15 matched controls.
• Administered a traditional Stroop task alongside the computerized versions.

Main Results:

• The ADHD group exhibited significantly higher interference scores compared to controls on the Colour-Stroop task.
• No significant differences in interference scores were found between the ADHD and control groups on the Counting Stroop task.
• Computerized tasks allowed for a more rigorous calculation of interference, separating speed and accuracy.

Conclusions:

• Interference control deficits in ADHD may not be a general impairment but are task-dependent.
• Findings highlight the importance of task-specific analysis and methodological rigor when assessing cognitive control in ADHD.
• Results suggest caution in interpreting Colour Stroop performance as a universal indicator of interference deficits in ADHD.