Electrophysiological evidence of enhanced distractibility in ADHD children
V Gumenyuk1, O Korzyukov, C Escera
1Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Helsinki, Finland. valentina.gumenyuk@helsinki.fi
Insights
Children with attention deficit hyperactivity disorder (ADHD) exhibit deficient involuntary attention control. This leads to increased distractibility, impacting cognitive performance and behavior in ADHD.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Attention deficit hyperactivity disorder (ADHD) is associated with behavioral and cognitive challenges.
- Enhanced distractibility in children with ADHD may stem from abnormal involuntary attention.
Purpose of the Study:
- To investigate involuntary attention mechanisms in children with ADHD.
- To examine event-related brain potentials (ERPs) in response to distracting novel sounds during a visual task.
Main Methods:
- Compared ERPs and visual task performance between children with ADHD and control children.
- Recorded brain activity using ERPs while participants performed a visual discrimination task with distracting novel sounds.
Main Results:
- Children with ADHD showed less accurate visual task performance and more omitted responses.
- Novel sounds elicited distinct ERP components (P3a, Late Negativity) with group differences in amplitude and latency.
- ADHD group exhibited altered P3a amplitudes and a smaller, shorter latency Late Negativity.
Conclusions:
- ADHD is linked to deficient involuntary attention control, evidenced by ERP and behavioral findings.
- These attentional deficits may explain the heightened distractibility observed in children with ADHD.
Abstract:
Abnormal involuntary attention leading to enhanced distractibility may account for different behavioral and cognitive problems in children with attention deficit hyperactivity disorder (ADHD). This was investigated in the present experiment by recording event-related brain potentials (ERPs) to distracting novel sounds during performance of a visual discrimination task. The overall performance in the visual task was less accurate in the ADHD children than in the control children, and the ADHD children had a higher number of omitted responses following novel sounds. In both groups, the distracting novel sounds elicited a biphasic P3a ERP component and a subsequent frontal Late Negativity (LN). The early phase of P3a (180-240 ms) had significantly smaller amplitudes over the fronto-central left-hemisphere recording sites in the ADHD children than in the control group presumably due to an overlapping enhanced left-hemisphere dominant negative ERP component elicited in the ADHD group. Moreover, the late phase of P3a (300-350 ms) was significantly larger over the left parietal scalp areas in the ADHD children than in the controls. The LN had a smaller amplitude and shorter latency over the frontal scalp in the ADHD group than in the controls. In conclusion, the ERP and behavioral effects caused by the novel sounds reveal deficient control of involuntary attention in ADHD children that may underlie their abnormal distractibility.
