1. Arguing in a Social Context Iyad Rahwan

2. Introduction Argument takes place in a social context  Arguing with oneself vs. arguing with others New challenges:  How does the audience evaluate arguments?  How do arguers strategize? Opportunities for cross-disciplinary work:  Experimental psychology  Game theory 2

3. The Psychology of Argument Evaluation 3

4. Simple Reinstatement H1: Defeat lowers confidence in A’s conclusion H2: Reinstatement increases confidence in A H3: Reinstatement fully restores confidence in A’s conclusion H4: Reinstatement is due to successfully defeating B (rather than supporting C) 4 I. Rahwan, M. I. Madakkatel, J. F. Bonnefon, R. N. Awan and S. Abdallah. Behavioural Experiments for Assessing the Abstract Argumentation Semantics of Reinstatement. Cognitive Science. (in press)

5. Floating Reinstatement Effect is identical to basic reinstatement! But no preference between C and D 5 I. Rahwan, M. I. Madakkatel, J. F. Bonnefon, R. N. Awan and S. Abdallah. Behavioural Experiments for Assessing the Abstract Argumentation Semantics of Reinstatement. Cognitive Science. (in press)

6. Argumentation and Strategic Behavior 6

7. Strategic Argumentation 7 I. Rahwan, K. Larson and F. Tohmé (2009). A Characterisation of Strategy- Proofness for Grounded Argumentation Semantics. In: Proceedings of IJCAI

8. Aggregating Judgments 8 Not a legal labeling! Theorem: No aggregation operator satisfies: universal domain, anonymity, systematicity, unanimity, collective rationality I. Rahwan and F. Tohmé (2010). Collective Argument Evaluation as Judgement Aggregation. In: Proceedings of AAMAS

9. Human Strategic Behavior 9 Will people reveal their goals? Will people exploit knowledge of their opponent’s goal? Will revelation enable cooperation? Y. Gal, S. D'souza, P. Pasquier, I. Rahwan and S. Abdallah (2009). The Effects of Goal Revelation on Computer-Mediated Negotiation. In: Proceedings of CogSci

10. Summary Message Must take seriously:  Psychological validity  Pragmatics (especially strategic behavior) Game theory Behavioral Heuristics 10