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Task switching and attention deficit hyperactivity disorder
N J Cepeda1, M L Cepeda, A F Kramer
1Beckman Institute and Department of Psychology, University of Illinois at Urbana-Champaign, USA.
Insights
Children with attention deficit hyperactivity disorder (ADHD) exhibit executive control deficits. ADHD medication significantly improved task-switching performance and response inhibition in children with ADHD.
Area of Science:
- Cognitive Psychology
- Neurodevelopmental Disorders
Background:
- Executive control processes are crucial for task management.
- Children with attention deficit hyperactivity disorder (ADHD) often display executive function challenges.
- Task set inhibition and preparation are key components of executive control.
Purpose of the Study:
- To investigate executive control efficiency in children with and without ADHD.
- To specifically examine task set inhibition and preparation in ADHD.
- To assess the impact of medication on executive control in ADHD.
Main Methods:
- Utilized a task-switching paradigm with ADHD and non-ADHD children.
- Administered tasks involving repeated single tasks (non-switch trials) and alternating tasks (switch trials).
- Calculated switch costs to measure executive control demands.
Main Results:
- ADHD children demonstrated significantly higher switch costs compared to non-ADHD children.
- Medication normalized the task-switching performance of ADHD children to control levels.
- ADHD medication enhanced the ability of children to inhibit inappropriate responses.
Conclusions:
- Executive control, particularly task set inhibition, is impaired in ADHD.
- Medication effectively mitigates executive control deficits in ADHD during task switching.
- Findings support cognitive models of ADHD and the role of executive functions.
Abstract:
The main goal of the present set of studies was to examine the efficiency of executive control processes and, more specifically, the control processes involved in task set inhibition and preparation to perform a new task in attention deficit hyperactivity disorder (ADHD) and non-ADHD children. This was accomplished by having ADHD children, both on and off medication, and non-ADHD children perform the task-switching paradigm, which involves the performance of two simple tasks. In nonswitch trials, an individual task is performed repeatedly for a number of trials. In switch trials, subjects must rapidly and accurately switch from one task to the other, either in a predictable or unpredictable sequence. Switch costs are calculated by subtracting performance on the nonswitch trials from performance on the switch trials. These costs are assumed to reflect the executive control processes required for the coordination of multiple tasks. ADHD children showed substantially larger switch costs than non-ADHD children. However, when on medication, the ADHD children's switch performance was equivalent to control children. In addition, medication was observed to improve the ADHD children's ability to inhibit inappropriate responses. These data are discussed in terms of models of ADHD and cognition.