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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
594

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Related Experiment Video

Updated: Dec 5, 2025

Using Brain Activation nir-HEG/Q-EEG and Execution Measures CPTs in a ADHD Assessment Protocol
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Is contrast sensitivity a physiological marker in attention-deficit hyperactivity disorder?

Yunus Emre Dönmez1, Özlem Özel Özcan1, Cem Çankaya2

  • 1Department of Child and Adolescent Psychiatry, Inonu University School of Medicine, Malatya, Turkey.

Medical Hypotheses
|October 19, 2020
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Summary

Children with attention-deficit hyperactivity disorder (ADHD) exhibit lower contrast sensitivity, which improves with methylphenidate (MPH) treatment. This suggests contrast sensitivity could be a physiological marker for ADHD.

Keywords:
ADHDContrast sensitivityMethylphenidateStimulant

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Child Psychiatry

Background:

  • Attention-deficit hyperactivity disorder (ADHD) is a common childhood disorder with complex etiology, potentially involving dopamine.
  • Methylphenidate (MPH), a first-line ADHD treatment, affects dopamine and norepinephrine transporters.
  • Dopamine influences retinal function and contrast sensitivity, but its role in ADHD-related contrast sensitivity is unclear.

Purpose of the Study:

  • To investigate contrast sensitivity in children with ADHD compared to controls.
  • To examine the effect of methylphenidate (MPH) on contrast sensitivity in children with ADHD.
  • To determine if contrast sensitivity can serve as a physiological marker for ADHD.

Main Methods:

  • The study included 30 children with ADHD and 30 controls.
  • Psychiatric evaluations used standardized scales (e.g., Schedule for Affective Disorders and Schizophrenia for School Age Children).
  • Photopic contrast sensitivity was measured using the Functional Acuity Contrast Test (FACT) at various spatial frequencies.

Main Results:

  • Children with ADHD had significantly lower contrast sensitivity than controls across all spatial frequencies before treatment.
  • Contrast sensitivity in ADHD children improved significantly after OROS-MPH treatment but remained lower than controls.
  • FACT scores were significantly higher in controls than ADHD patients during OROS-MPH treatment at specific spatial frequencies.

Conclusions:

  • Contrast sensitivity is reduced in children with ADHD.
  • OROS-MPH treatment significantly enhances contrast sensitivity in children with ADHD.
  • Contrast sensitivity may represent a potential physiological marker for ADHD, warranting further investigation.