Relationship between extensions and intensions in categorization: A match made in heaven?

Area of Science:

• Cognitive Psychology
• Linguistics
• Semantic Memory

Background:

• The relationship between a concept's extension (members) and intension (properties) is fundamental to semantic memory.
• Previous research (Hampton & Passanisi, 2016) questioned the assumed strong link between extension and intension, particularly regarding individual differences.

Purpose of the Study:

• To conceptually replicate and investigate the extension-intension link.
• To examine if individual differences in extensional judgments align with intensional judgments.
• To explore the predictive power of individual intensions on individual category judgments.

Main Methods:

• Two studies were conducted using a category judgment task for extensions.
• Study 1 used a property generation task; Study 2 used a property judgment task for intensions.
• Analyses included correlating similarity matrices and multilevel logistic regression.

Main Results:

• Correlations between extension and intension similarity matrices were nonsignificant, mirroring prior findings.
• Multilevel logistic regression revealed that an individual's generated/endorsed properties predicted their own category judgments better than others'.
• This suggests a subject-level link between intension and extension.

Conclusions:

• The study presents conflicting evidence regarding the extension-intension link, depending on the analytical approach.
• While group-level similarity doesn't map directly, individual-level intensional properties appear to influence individual extensional judgments.
• These findings have implications for understanding semantic representation and individual conceptual structures.