EEG Brain Wave Activity at Rest and during Evoked Attention in Children with Attention-Deficit/Hyperactivity Disorder
Bianca Lee Thomas1, Margaretha Viljoen
1Department of Human Anatomy and Physiology, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa.
Insights
Methylphenidate appears to disrupt the typical brain wave response to focused attention in children with attention-deficit/hyperactivity disorder (ADHD). This medication may reduce the brain
Area of Science:
- Neuroscience
- Pediatric Psychiatry
- Cognitive Science
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
- Electroencephalography (EEG) measures brain wave activity, offering insights into cognitive processes.
- Methylphenidate is a common stimulant medication used to manage ADHD symptoms.
Purpose of the Study:
- To evaluate baseline EEG brain wave patterns in children diagnosed with ADHD.
- To investigate the impact of methylphenidate on EEG activity during focused attention.
- To compare brain wave responses between children with ADHD and neurotypical controls.
Main Methods:
- EEG brain wave activity was recorded in 19 children with ADHD and 18 control subjects.
- Participants were tested under two conditions: stimulant-free and while on methylphenidate (for ADHD group).
- EEG was assessed at baseline and during a task designed to evoke focused attention using biofeedback apparatus.
Main Results:
- Both control subjects and stimulant-free children with ADHD showed expected high alpha-wave (11-12 Hz) reactivity from baseline to focused attention.
- Methylphenidate administration appeared to abolish this normal alpha-wave reactivity in children with ADHD.
- This suggests a significant alteration in cortical response to cognitive challenges when on medication.
Conclusions:
- Methylphenidate may attenuate the typical cortical response to cognitive challenges in children with ADHD.
- The findings highlight a potential mechanism by which methylphenidate affects attention and cognitive processing.
- Further research is warranted to fully understand the neurophysiological effects of methylphenidate in ADHD.
Objective:
The aim of this study was to assess baseline EEG brain wave activity in children with attention-deficit/hyperactivity disorder (ADHD) and to examine the effects of evoked attention and methylphenidate on this activity.
Method:
Children with ADHD (n = 19) were tested while they were stimulant free and during a period in which they were on stimulant (methylphenidate) medication. Control subjects (n = 18) were tested once. EEG brain wave activity was tested both at baseline and during focussed attention. Attention was evoked and EEG brain wave activity was determined by means of the BioGraph Infiniti biofeedback apparatus.
Results:
The main finding of this study was that control subjects and stimulant-free children with ADHD exhibited the expected reactivity in high alpha-wave activity (11-12 Hz) from baseline to focussed attention; however, methylphenidate appeared to abolish this reactivity.
Conclusion:
Methylphenidate attenuates the normal cortical response to a cognitive challenge.
Related Concept Videos
01:30Attention-Deficit/Hyperactivity Disorder
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
01:23Brain Waves