Using different agent personalities to obtain different agent behaviors Joaquin Taverner, Bexy Alfonso, Emilio Vivancos, and Vicente Botti Departamento de Sistemas Inform´ aticos y Computaci ´ on Universitat Polit` ecnica de Val` encia, Spain joataap@dsic.upv.es Abstract. Personality defines who we are, how we think and the way we behave and relate to others. Personality is defined as a set of individual characteristics that influence motivations, behaviors, and emotions when facing a particular circum- stance. However, the personality is not usually taken into account when creating affective agent architectures that simulate human behavior. In this paper we show the results we have obtained executing agents with common actions but different behaviors due to their different personalities. We have used the GenIA 3 archi- tecture for affective BDI agents that we previously modified to allow the use of personality. Keywords: Jason, personality, agent, behavior, emotion modelling. 1 Introduction Personality is a construct that is used in psychology to explain the individual dif- ferences that constitute a person and allows him/her to differentiate from others. Personality influences the way in which emotional responses to specific stimuli occur [1]. As with many abstract concepts, there is no absolute consensus on what should be understood by personality. One of the most accepted definitions indicates that personality is the dynamic organization, within the individual, of the psychophysical systems responsible for their characteristic thought and be- havior [2]. In general, we can say that personality is a set of distinctive features of a person that remain relatively stable over time and are invariant in different situations that explain the way in which a person behaves. Despite the importance of personality in human beings, it is not usually taken into account when mod- els of affective agent are described. There are some works that use personality in agents, but always as a secondary affective component used to create more realistic agents [3]. However, personality can be very useful in modeling multi- agent systems since it allows different agents to show different behavior when faced with the same situation. In this work we analyze the results obtained by introducing the personality in the affective agents architecture GenIA 3 [4]. 2 Background and supporting theories Personality is related to cognitive processes such as reasoning, memory [5], atten- tion, decision making [6], the ability to solve problems or perception among oth- ers [7,8]. For example, extraverted people tend to outperform introverted people