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AbstractThe Affect Infusion Model (AIM) is a prominent theory of when current emotional state is expected to influence the interpretation of a social stimulus (situation). We discuss the assumptions in AIM and conclude that its current specification predicts that both deliberation time and situational complexity should lead to affect infusion.The aim of this research was to clarify the relative importance of these factors in determining affect infusion, and hence aid the further development of AIM. We present an experimental design in which situational complexity and deliberation time can be manipulated orthogonally as independent factors. Our results show that it is the latter factor, but not the former, which can influence the degree of affect infusion. According to AIM, when interpreting a novel social situation, affect infusion is defined to occur when our current emotional state leads to an interpretation of the situation specifically congruent with this emotional state (cf. Bower, 1981;Forgas, 1995a;Isen, Shalker, Clark, & Karp, 1978). For example, consider a scene of a man and a woman talking to each other, such that there are no cues as to whether this is a happy/excited interaction or an unhappy/angry one. Affect infusion would occur if people in (say) an unhappy mood would be more likely to offer unhappy interpretations-this is the basis of our experimental investigation.Forgas (1995a) proposed that there are four relevant (i.e., when it comes to considering possible interactions between cognition and emotion) modes of cognitive processing; knowing which mode of cognitive processing applies in a given situation can help predict whether affect infusion will occur or not ( Figure 1). First, a person can access information about a belief already held; in such cases, an emotional valence may already be attached to a belief and therefore there would be little scope for the current emotional state to affect perception of the belief (this mode is referred to as 'direct access'). For example, the attitude towards environmental issues of a committed environmentalist will not be affected by her current state of mind. Second, there are situations where information processing takes place in order to accomplish a specific goal, and so an effort would be made to specifically suppress potential emotional influences (this is the 'motivated processing' mode Kunda, 1990). An example of this is the finding of Bower (1981;Isen, 1984), whoshowed that participants in an unhappy mood are more likely to recall unhappy episodes etc.The third and fourth modes of cognitive processing are considered 'constructive', in the sense that a person's reliance on existing knowledge representations, e.g., for understanding a novel social situation, is limited; therefore, novel representations have to be constructed from the combination of stored information and new stimulus details (Fiedler, 19...