The paper deals with the issue of signification in Dada creation which is well known for its goal of « abolition of logic », and its literary consequence: structures not respecting the speech acts to the point that they seem to destroy the very possibility of presence of acceptable significations. The author of the paper, suggesting to name these rebel structures « motivation attacks », starts her research from the famous interpretation of Dada activity by Jacques Rivière : « It is impossible for a man to say something that has no meaning » (La Nouvelle Revue Française, 1920), and puts out these main questions: What can be the concrete impact of motivation attacks? To which acceptable significations can they lead? Can these have a different...