Cognitive operations and evidentiality in scientific discourse

The problem of discourse determination of evidential markers explication in scientific discourse on the data of the scientific article is considered in the paper. An attempt is made to overcome intuitive nature of reasons to explicate or implicate the evidential markers in an utterance by means of revealing stable replicable statements, accompanying a number of cognitive actions and serving contextual effects associated with them. A relationship of evidentiality markers explication with a pragmatic potential of a statement is identified; discourse determination of evidential key change is described.