Multi-level selection in the emergence of language systematicity

Trabajo presentado a la 9th European Conference in Artificial Life (ECAL), celebrada en Lisboa (Portugal) del 10 al 14 de septiembre de 2007.Language can be viewed as a complex adaptive system which is continuously shaped and reshaped by the actions of its users as they try to solve communicative problems. To maintain coherence in the overall system, different language elements (sounds, words, grammatical constructions) compete with each other for global acceptance. This paper examines what happens when a language system uses systematic structure, in the sense that certain meaning-form conventions are themselves parts of larger units. We argue that in this case multi-level selection occurs: at the level of elements (e.g. tense affixes) and at the level of larger units in which these elements are used (e.g. phrases). Achieving and maintaining linguistic coherence in the population under these conditions is non-trivial. This paper shows that it is nevertheless possible when agents take multiple levels into account both for processing meaning-form associations and for consolidating the language inventory after each interaction.This research was funded (for PW) by a Belgian FWO TM 298 project and (for LS and RvT) by the Future and Emerging Technologies program (IST-FET) of the European Commission under the EU RD contract IST-1940Peer reviewe