Task demands interact with the single and combined effects of medication and contingencies on children with ADHD

Area of Science:

• Neuroscience
• Developmental Psychology
• Behavioral Science

Background:

• Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by inattention and/or hyperactivity-impulsivity.
• Treatment for ADHD often involves stimulant medication and behavioral interventions, such as contingencies.
• The interaction between medication, contingencies, and cognitive demands in ADHD is not fully understood.

Purpose of the Study:

• To examine the individual and combined effects of stimulant medication and behavioral contingencies on ADHD children's performance.
• To investigate how these treatments impact performance on tasks with varying cognitive demands.

Main Methods:

• A within-subjects design was employed with children diagnosed with ADHD.
• Participants completed a match-to-sample task and a stop-signal task under conditions of medication/placebo and reward/response cost/no contingency.
• Treatments were administered double-blind and in a counterbalanced order across two sessions.

Main Results:

• Both stimulant medication and contingencies, when administered alone, enhanced performance on both tasks.
• For the match-to-sample task, the combination of medication and contingencies was superior to either treatment alone.
• For the stop-signal task, medication combined with response cost was more effective than either treatment alone, while medication and reward were not.

Conclusions:

• Both medication and contingencies are effective in improving task performance for children with ADHD.
• The effectiveness of combined treatments interacts with specific task demands, suggesting a nuanced approach to intervention.
• Findings highlight the importance of considering cognitive load when designing ADHD treatment strategies.