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Vestibulo-ocular reflex and visual vestibulo-ocular reflex during sinusoidal rotation in children
M Sakaguchi1, K Taguchi, K Sato
1Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan.
Insights
Children aged 3-6 years exhibit a higher vestibulo-ocular reflex (VOR) gain than adults in darkness, suggesting immature inhibitory regulation. This difference diminishes with visual (optokinetic) stimuli.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Ophthalmology
Background:
- The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements.
- Understanding VOR development in children is crucial for identifying potential visual-vestibular processing disorders.
- The interplay between vestibular and visual stimuli in VOR regulation is not fully elucidated in young children.
Purpose of the Study:
- To investigate the relationship between vestibular and visual (optokinetic) stimuli in normal children.
- To compare VOR and visual VOR (VVOR) in children and adults.
- To explore potential developmental differences in VOR inhibitory regulation.
Main Methods:
- Studied 20 healthy children (3-6 years) and 24 healthy adults (21-29 years).
- Measured VOR gains and phase under two visual conditions: complete darkness and a lighted optokinetic drum.
- Analyzed differences in VOR parameters between age groups and visual conditions.
Main Results:
- No significant difference in VOR phase between children and adults in either condition.
- Children showed significantly higher VOR gain than adults in complete darkness.
- Children's VOR gain was comparable to adults' when exposed to optokinetic stimuli.
Conclusions:
- Children aged 3-6 years exhibit enhanced VOR gain in the absence of visual input.
- This heightened gain in children may indicate an immature inhibitory regulation system for the VOR.
- Visual (optokinetic) stimuli appear to modulate and normalize VOR gain in children, bringing it closer to adult levels.
Abstract:
To clarify the relationship between vestibular and visual (optokinetic) stimuli in normal children, we investigated the vestibulo-ocular reflex (VOR) and visual VOR (VVOR). The subjects were 20 healthy children aged 3-6 years and 24 healthy adults aged 21-29 years. The VOR gains and phase were measured under two visual conditions: with eyes open in complete darkness and with eyes open in a lighted optokinetic drum. In both visual conditions, phase did not significantly differ between children and adults. In the dark, children presented a significantly larger gain than that of adults. In the optokinetic drum, however, the gain values of the children were almost the same as in adults. We suggest that the large VOR gain values of children may be due to immaturity of the inhibitory regulation system of the VOR.