The purpose of this paper is to explore the patterns of realization of projection of different voices in discussions of research articles in Spanish from two disciplines: Microbiology and Sociology. Because it can be realized by different means in the lexico-grammar, projection has been considered from the perspective of Systemic-Functional Linguistics as a 'semantic motif' (Halliday, 1994: 219), as a phenomenon of 'semantic domain' (Halliday y Matthiessen, 2004: 603-4) or as a discourse-semantic phenomenon (Martin 1992:17-19; Martin & White, 2005: 11). In fact, projection can be realized congruently by a clause nexus, and metaphorically by other grammatical resources. In this paper, different and varied patterns of realization of projection in Spanish have been analyzed in a brief corpus, in order to apply the results to the future study of heteroglossia in the social context of science. The analysis of Transitivity and of tactic and logico-semantic relations have revealed in the texts of each discipline: a) the realization of the sources of projection, b) the means of realization of projection itself and c) the status of what is projected, as a clause in a clause nexus or as an element with an experiential function in the configuration of the clause as representation.
projection; congruent realization; metaphorical realization; research article