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In a study, we examine the influence of a source representing an authority when it accompanies its divergent position by imperative communications. More precisely, one compares a control situation with other conditions in which a source of high-statute introduces a divergent position, with or without prescriptions. We observe direct and indirect changes in a perceptive task and we introduce the procedure measurement of attention on the stimuli. The results reveal that communication produces changes at direct and indirect levels. Moreover, one observes an effect of communications with respect to the object translating the divergent position of the source.