Speaking about knowledge

We focus on the grammatical expression of four major groups of meanings related to knowledge: I. Evidentiality: grammatical expression of information source; II. Egophoricity: grammatical expression of access to knowledge; III. Mirativity: grammatical expression of expectation of knowledge; and IV. Epistemic modality: grammatical expression of attitude to knowledge. The four groups of categories interact. Some develop overtones of the others. Epistemic-directed evidentials have additional meanings typical of epistemic modalities, while egophoricity-directed evidentials combine some reference to access to knowledge by speaker and addressee. Over the past thirty years, new evidential choices have evolved among the Tariana – whose language has five evidential terms in an egophoricity-directed system – to reflect new ways of acquiring information, including radio, television, phone, and internet. Evidentials stand apart from other means of knowledge-related categories as tokens of language ecology corroborated by their sensitivity to the changing social environment.