This study concerns the evolution of listeners' production during narrations in a French conversational corpus. Using the method of Conversational analysis in a first part of the study, we show that listeners use different discursive devices throughout the narration. In a second part, we attempt to estimate this behavior in a systematic way by measuring the richness of morpho-syntactic categories. We confirm the presence of specific discursive devices as repetition or reported speech produced by listeners in the end of the narrative while only a slight tendency is observed concerning the increasing density of the richer morphosyntactic categories.