What's in a shape? Children represent shape variability differently than adults when naming objects

Area of Science:

• Cognitive psychology
• Developmental psychology
• Linguistics

Background:

• Children and adults often generalize novel words to objects based on shared shape properties.
• The specific shape dimensions influencing this generalization and developmental differences remain unclear.

Purpose of the Study:

• To investigate the categorical representation of shape dimensions during word generalization in children and adults.
• To determine if adults and children utilize distinct shape boundaries when generalizing object names.

Main Methods:

• Utilized multidimensional scaling to define perceptual similarity between object sets.
• Conducted generalization tasks with children (2;8–4;5 years) and adults, learning novel object names.
• Assessed generalization from memory and with the exemplar present, to objects and line drawings.

Main Results:

• Adults demonstrated categorical generalization, favoring objects within established shape boundaries.
• Children (2;8–4;5 years) showed less adherence to shape boundaries, generalizing names equally to objects within and across boundaries.
• Generalization patterns were consistent across tasks (memory vs. presence of exemplar).

Conclusions:

• Adults' word generalization relies on categorical shape representations, implying a developed understanding of shape boundaries.
• Young children's generalization patterns suggest a less constrained use of shape properties, potentially reflecting ongoing development in conceptual categorization.
• Findings highlight developmental shifts in how shape information is utilized for word learning and generalization.