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Hashimoto, T. and Ikegami, T. (1995) Evolution of Symbolic Grammar Systems. In F. Moran and et al., editors, ECAL95, pages 812--823.
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Evolution of Symbolic Grammar Systems
Takashi Hashimoto ? and Takashi Ikegami ??
Institute of Physics, College of Arts and Sciences, University of Tokyo,
Komaba 3­8­1,Meguro­ku, Tokyo 153, Japan
Abstract. Evolution of symbolic language and grammar is studied in a network model. Language is expressed by words, i.e. strings of sym­ bols, which are generated by agents with their own symbolic grammar system. By deriving and accepting words, the agents communicate with each other. An agent which can derive less frequent and less accept­ able words and accept words in less computational time will have higher scores. Grammars of agents can evolve by mutationally processes, where higher scored agents have more chances to breed their offsprings with improved grammar system. Complexity and diversity of words increase in time. It is found that the module type evolution and the emergence of loop structure enhance the evolution. Furthermore, ensemble struc­ ture (net­grammar) emerges from interaction among individual grammar systems. A net­grammar restricts structures of individual grammar and determines their evolutionary pathway.
1 Introduction Linguistic expressions are quite complex but may not be random. It is commonly assumed that one has to have an internal knowledge (hereafter individual gram­ mar) of one's language when one can derive and recognize appropriately struc­ tured expressions. On the other hand, linguistic expressions are determined and restricted by a community of agents. Language is used by many speakers, not just a single speaker, the language as a whole is produced through interaction among various individual grammars. In this respect, a network determining grammar may be more important for linguistic expressions than internal knowledge. An individual grammar does not have a static form but dynamically changes: it can undergo changes induced by interactions with physical and cultural environment or conversations with other people. We have to discuss how ...
BibTex
@inproceedings{hashimoto95evolutionOf,
  author={T. Hashimoto and T. Ikegami},
  title={Evolution of Symbolic Grammar Systems},
  year={1995},
  pages={812-823},
  editor={F. Moran and et al.},
  booktitle={ECAL95},
  url={http://www.isrl.uiuc.edu/~amag/langev/paper/hashimoto95evolutionOf.html}
}

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