International audienceResearchers consider rumours from a social psychological view which (Moscovici, 1970, 1984) brings to light two difficulties and provides two levels of interpretation. The first difficulty is encountered by many authors and lies in how to define a rumour, an almost imperceptible phenomenon insofar as it exists only when it tells a false story. We show a first level of interpretation through a discussion of the criteria chosen by authors to define rumours and in particular the criterion of truth used by authors. The second difficulty is how individuals perceive the researcher as they exchange the rumors, or like an alter-ego outside of this procès? We have, therefore, risen the researcher’s position in the overall proce...