Development of internal models and predictive abilities for visual tracking during childhood

Area of Science:

• Neuroscience
• Developmental Psychology
• Oculomotor Control

Background:

• Internal models are crucial for motor control, enabling prediction of action consequences.
• Previous research indicated age-related improvements in anticipatory behaviors for grasping, drawing, and postural control.
• Eye movement prediction, specifically visual tracking of temporarily invisible targets, offers a distinct measure of internal model development.

Purpose of the Study:

• To investigate the developmental trajectory of predictive mechanisms in eye movements.
• To assess the maturation of internal models governing the synergy between saccadic and pursuit eye movements in children.
• To explore the relationship between oculomotor predictive abilities and cerebellar maturation.

Main Methods:

• Recorded eye movements in 50 children (5-19 years) and 10 adults.
• Participants pursued a visual target that was temporarily blanked.
• Analyzed oculomotor behavior, focusing on accuracy and variability upon target reappearance.

Main Results:

• Youngest children (5-7 years) exhibited general oculomotor behavior similar to adults.
• Older children demonstrated significantly better accuracy and reduced behavioral variability compared to the youngest.
• Performance improvements indicated a late maturation of predictive mechanisms and internal models for eye movements.

Conclusions:

• The accuracy of internal models for eye movement prediction develops significantly with age.
• The maturation of the interaction between smooth pursuit and saccades, reliant on internal models, is linked to cerebellar development.
• These findings highlight the prolonged development of predictive eye movement control and its neural underpinnings.