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This paper aims to contribute to the knowledge of linguistic change over the lifespan by means of panel studies. The analysis offered presents two elements that have received little treatment within the field. On the one hand, the analysis is interested in the evolution or development of the lexicon in dialogical speech; on the other hand, the analysis is carried out on material from a panel study on the Spanish language. This text analyzes the evolution of lexical richness by means of an exploratory panel study based on semi-guided interviews carried out in Madrid, a Spanish city included in the framework of the international PRESEEA project.
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