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The paper defines the notion of agreement from a cognitive point of view and analyses types of agreement signals in TV debates. Agreement is defined as a relation of identity, similarity or congruence between the opinions of two or more persons, by contrasting it with confirmation and admission, and the connected notions of proposal, assessment and opinion are overviewed. Research is then presented on the multimodal signals of agreement in debates from the Canal 9 and the AMI corpora; different ways to express agreement are singled out in extensive discourse, single words and body signals, and analysed through an annotation scheme of multimodal data. Different types of agreement are illustrated, including true, indirect and apparent agreement.

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The paper analyzes the move of discrediting the opponent as a means to persuasion in political debates. After analysis of a corpus of political debates, a typology of discrediting strategies is outlined, distinguished in terms of three criteria: the target-the feature of the opponent specifically attacked (dominance, competence, benevolence); the route through which it is attacked-topic, mode or directly the person; and the type of communicative act that conveys the attack (insult, criticism, correction. . .). The relevance of body signals in discrediting moves is highlighted.