The world within: Children are sensitive to internal complexity cues.

Area of Science:

• Cognitive Development
• Psychology
• Object Perception

Background:

• Children's understanding of object function is linked to their perception of internal parts.
• Prior research indicates children view "insides" as critical for object functionality.
• However, specific expectations children hold about the complexity of an object's insides are not well-understood.

Purpose of the Study:

• To investigate children's and adults' judgments of internal and causal complexity in real-world objects.
• To determine if children associate object complexity with the complexity of their internal structures.
• To identify specific features of internal parts that convey complexity to children.

Main Methods:

• Children (n=378) and adults (n=124) made internal and causal complexity judgments on real-world objects.
• Study 1: Assessed success in internal and causal complexity judgments across different age groups (4-6 years old).
• Study 2 & 3: Examined sensitivity to specific internal complexity cues (number, area, diversity, connections of parts) in children and adults.

Main Results:

• 5- and 6-year-olds, but not 4-year-olds, succeeded at internal complexity judgments.
• All age groups successfully identified complex artifacts as causally complex.
• Younger children (5-year-olds) primarily used number/area of parts, while older children and adults used more detailed cues like diversity and connections.

Conclusions:

• Young school-age children possess detailed and abstract expectations regarding internal complexity, even with limited exposure to object insides.
• Children's understanding of object complexity extends to the intricate nature of their internal components.
• Developmental differences exist in the specific cues children use to infer internal complexity.