Problem solving in infancy: the emergence of an action plan

Area of Science:

• Developmental Psychology
• Motor Control
• Cognitive Neuroscience

Background:

• Infants' early object interactions are crucial for cognitive and motor development.
• Understanding the developmental trajectory of grasping strategies provides insights into early planning abilities.

Purpose of the Study:

• To investigate the developmental changes in young children's object grasping strategies.
• To identify age-related differences in how children adapt their approach to object orientation.
• To propose a model for the development of action-selection strategies in pre-verbal children.

Main Methods:

• Observational study involving 9-, 14-, and 19-month-old infants.
• Presentation of objects (spoons with food, toys on handles) with alternating left/right handle orientations.
• Analysis of children's reaching and grasping behaviors, focusing on hand preference and grip formation.

Main Results:

• Younger infants (9 months) predominantly used their preferred hand, leading to awkward grasps requiring later correction.
• Older infants (19 months) demonstrated anticipatory strategies, alternating hands and employing efficient radial grips for both orientations.
• A developmental progression in grasping strategy was observed between 9 and 19 months.

Conclusions:

• Children's object grasping strategies evolve significantly within the first two years of life.
• The development involves a shift from simple hand preference to more sophisticated, anticipatory planning and adaptive grip formation.
• A model of action-selection strategy development can explain early planning mechanisms in infants.