This study explores paraphrastic reformulation from a theoretical-experimental approach: it is defended that paraphrase is not a discourse activity to be easily produced and processed. Previous approaches defend the contrary approach: reformulation is a harder function since it is not based on equivalence but distance between formulations. This paper presents quantitative and qualitative results showing that paraphrase involves hard processes despite being based on an equivalence between two formulations (E. Gülich & Th. Kotschi 1983, 1995). Eye-tracking experimental techniques allow measuring cognitive efforts behind information assimilation by addressing ocular movements and their duration (eye-mind hypothesis, K. Rayner 1998). Data o...