The aim of the paper is to explore the interrelation between persuasion tactics and properties of speech acts. We investigate two types of arguments ad: ad hominem and ad baculum. We show that with both of these tactics, the structures that play a key role are not inferential, but rather ethotic, i.e., related to the speaker's character and trust. We use the concepts of illocutionary force and constitutive conditions related to the character or status of the speaker in order to explain the dynamics of these two techniques. In keeping with the research focus of the Polish School of Argumentation, we examine how the pragmatic and rhetorical aspects of the force of ad hominem and ad baculum arguments exploit trust in the speaker's status to influence the audience's cognition.
In this paper, I develop a speech-act based account of presumptions. Using a scorekeeping model of illocutionary games, I argue that presumptions construed as speech acts can be grouped into three illocutionary act types defined by reference to how they affect the state of a conversation. The paper is organized into two parts. In the first one, I present the score-keeping model of speech act dynamics; in particular, I distinguish between two types of mechanisms-the direct mechanism of illocution and the indirect one of accommodation-that underlie the functioning of illocutionary acts. In the second part, I use the presented model to distinguish between (1) the unilateral act of individual presumption, the point of which is to shift the burden of proof by making the hearer committed to justifying his refusal to endorse the proposition communicated by the speaker, whenever he refuses to endorse it, (2) the bilateral act of joint presumption-'bilateral' in that it is performed jointly by at least two conversing agents-the function of which is to confer on the proposition endorsed by the speaker the normative status of jointly recognized though tentative acceptability, and (3) the indirect or back-door act of collective presumption, the purpose of which is to sustain rules and practices to which the conversing agents defer the felicity of their conversational moves.
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