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Area of Science:

  • Linguistics
  • Cognitive Science
  • Anthropology

Background:

  • Language shapes human experience through categorization.
  • Cross-linguistic comparisons reveal universal principles of categorization.
  • Symmetry is proposed as a fundamental principle influencing category system structure.

Purpose of the Study:

  • To present a symmetry-based theory predicting the number of categories in linguistic systems.
  • To test this theory against cross-linguistic data from various domains.
  • To investigate the influence of symmetry on categorization across diverse languages and domains.

Main Methods:

  • Developed a theory based on symmetry to predict category numbers (even/odd).
  • Analyzed existing cross-linguistic datasets for multiple domains.
  • Compared theoretical predictions with empirical data on category systems.

Main Results:

  • Deictic day-naming and tense-marking systems predominantly exhibit an odd number of categories.
  • Category systems for seasons, moon phases, kinship, and cardinal directions tend to have an even number of categories.
  • The findings support the proposed symmetry-based theory.

Conclusions:

  • Symmetry significantly influences the structure of categorization systems across languages.
  • The study provides evidence for a universal principle shaping how humans organize experience.
  • The symmetry principle offers a predictive framework for understanding linguistic categorization.