Color vision in attention-deficit/hyperactivity disorder: a pilot visual evoked potential study
Soyeon Kim1, Tobias Banaschewski2, Rosemary Tannock3
1Department of Applied Psychology & Human Development OISE, University of Toronto, Toronto, Canada.
Journal of Optometry
|December 2, 2014
Summary
Adolescents with attention-deficit/hyperactivity disorder (ADHD) show enhanced neural responses to blue-yellow stimuli, suggesting a compensatory mechanism for visual processing differences. This objective measure aids in understanding ADHD-related visual function.
Area of Science:
- Neuroscience
- Ophthalmology
- Psychiatry
Background:
- Individuals with ADHD often report visual issues, but findings are inconsistent.
- Objective measures are needed to clarify visual function and color perception in ADHD.
Purpose of the Study:
- To investigate visual function and color perception in adolescents with ADHD.
- To utilize color Visual Evoked Potentials (cVEP) for objective assessment.
Main Methods:
- Thirty-one adolescents (16 with ADHD, 15 controls) aged 13-18 participated.
- Ophthalmological exams and cVEP testing (blue-yellow, red-green, achromatic stimuli) were performed.
- P1 response latency and amplitude to stimuli were measured.
Main Results:
- No ophthalmological differences were found between groups.
- ADHD group showed significantly larger P1 amplitude for blue-yellow stimuli compared to controls.
- No significant differences were observed for red-green or achromatic stimuli.
Conclusions:
- Enhanced P1 amplitude for blue-yellow stimuli in ADHD may explain normal color perception task performance.
- This finding might indicate a compensatory strategy for compromised retinal input due to hypo-dopaminergic tone in ADHD.
- cVEP provides an objective measure of visual processing differences in ADHD.
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