This paper investigates the development of the Italian negative particle mica as an increase in \u2018\u2018intersubjectivity\u2019\u2019, in the sense of an increasing coding of the speaker\u2019s awareness of the interlocutor\u2019 attitudes and beliefs (cf. e.g. Traugott, in press). Extending to a diachronic perspective Schwenter\u2019s (2003, 2005, 2006) hypotheses on the relationship between marked, or \u2018\u2018non-canonical\u2019\u2019, negation and information structural constraints, the first part of the paper examines the relationship between the negated proposition and the preceding co-text in data from the XIII to the XX century. Two main trends are identified: (i) a decrease of the cases where the link with the preceding co-t...