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Necessity and natural categories.

¹Psychology Department, Northwestern University, Evanston, Illinois 60208, USA. rips@northwestern.edu

Psychological Bulletin

|December 1, 2001

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Human understanding of natural categories involves knowing current truths and hypothetical possibilities. Research explores category-based induction, transformations, and definitions to explain these beliefs.

Area of Science:

Cognitive Science
Psychology
Linguistics

Background:

Human knowledge extends beyond factual truths to include counterfactual and hypothetical scenarios related to natural categories.
Understanding these modal beliefs is crucial for explaining category-based reasoning and language use.

Purpose of the Study:

To review and synthesize evidence from three distinct research streams concerning beliefs about natural categories.
To explore unified theories that can account for modal category information, including ideals, norms, and causal relations.

Main Methods:

Examination of experimental results from category-based induction.
Analysis of studies on hypothetical transformations of category members.
Review of research on the definitions of kind terms.

Related Experiment Videos

Main Results:

Evidence from induction, transformations, and definitions supports the existence of beliefs about non-actual category properties.
Theories considering ideals, norms, and causal interactions offer frameworks for understanding modal category knowledge.

Conclusions:

Human conceptual knowledge inherently includes modal or hypothetical reasoning about natural categories.
Two primary frameworks, one emphasizing essential properties and the other causal relations, can explain this modal information.