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This paper deals with the dynamic construction of the discursive object INTERMITTENT in a media corpus. Our goal is to integrate a discursive point of view into a semantic perspective : discursive corpus are priorized, because they define places of inscription as well as spontaneous modeling for common sense ; and these discursive sets must thus allow to bring back the dynamics of meaning to the formations which are in the beginning, in order to define contours of ambient topics relating to a particular object. The notions of ‘common sense’ (Sarfati 1996) and of perception will be the background of this topic analysis, in witch the discursive and ideological dimensions of meaning are put forward, taking into account textual, semantic, and discursive dimensions of the construction of meaning.