Related Experiment Video
Updated: Apr 11, 2026
05:32
Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos
Published on: December 7, 2018
9.9K
Gap Effect Abnormalities during a Visually Guided Pro-Saccade Task in Children with Attention Deficit Hyperactivity
Yuka Matsuo1, Masayuki Watanabe2, Masako Taniike3
1Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan.
Plos One
|May 29, 2015
Summary
Children with Attention Deficit Hyperactivity Disorder (ADHD) show abnormal saccadic eye movements. This study suggests saccadic eye movements, specifically the gap effect, could be a new biomarker for diagnosing ADHD in children.
Area of Science:
- Neuroscience
- Developmental Psychology
- Ophthalmology
Background:
- Attention Deficit Hyperactivity Disorder (ADHD) is a prevalent neurodevelopmental disorder impacting lifelong psychosocial and educational functioning.
- Current diagnostic criteria for ADHD are subject to debate, highlighting the need for objective biomarkers.
- Saccadic eye movements offer a quantifiable measure relevant to various neurological and psychiatric conditions, including ADHD.
Purpose of the Study:
- To investigate saccadic eye movement abnormalities in children diagnosed with ADHD.
- To explore the neurophysiological underpinnings of ADHD-related behavioral impairments through eye movement analysis.
- To determine if the saccadic gap effect can serve as a diagnostic biomarker for childhood ADHD.
Main Methods:
- A visually guided pro-saccadic eye movement task was administered to 37 children with ADHD and 88 typically developing (TD) children (aged 5-11 years).
- The task involved interleaved step and gap conditions to evaluate the saccadic gap effect, defined as the difference in reaction time between conditions.
- Reaction times and the magnitude of the gap effect were compared between the ADHD and TD groups.
Main Results:
- Children with ADHD exhibited significantly longer saccadic reaction times compared to TD children (p < 0.01).
- The saccadic gap effect was markedly attenuated in children with ADHD (p < 0.01), indicating altered predictive eye movement control.
- These findings demonstrate distinct saccadic eye movement patterns in children with ADHD.
Conclusions:
- Saccadic eye movement measurement presents a novel approach for assessing behavioral symptoms and clinical features of ADHD.
- The saccadic gap effect shows potential as a sensitive biomarker for early childhood ADHD diagnosis.
- Quantifiable eye movement metrics may aid in objective ADHD evaluation and diagnosis.
