Saccadic eye movements in children: a developmental study

Area of Science:

• Neuroscience
• Developmental Psychology
• Ophthalmology

Background:

• Saccadic eye movements are crucial for visual processing.
• The developmental trajectory of horizontal saccades in children is not fully understood.
• Existing research lacks comprehensive studies on voluntary and reflexive saccades using diverse paradigms.

Purpose of the Study:

• To investigate the development of horizontal saccades in children aged 6-15 years.
• To analyze the impact of age on reflexive and voluntary saccade characteristics.
• To establish normative data for saccadic development in childhood.

Main Methods:

• Binocular eye movements were recorded using infrared video-oculography (mobileEBT®, e(ye)BRAIN).
• Seventy-two children aged 6-15 years participated in the study.
• Multiple paradigms (gap, step, overlap) were employed to elicit horizontal saccades, including anti-saccades.

Main Results:

• Saccade latency decreased with age across all paradigms.
• The error rate in anti-saccade tasks diminished with increasing age.
• Saccade gain improved with age, while peak velocity remained stable.
• Saccadic performance showed significant age-related improvements.

Conclusions:

• Saccadic performance in children is significantly influenced by age.
• Cortical circuits for saccade preparation mature by approximately 12 years of age.
• The findings provide reference values for developmental studies and clinical assessments.