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Many researchers share the idea that cognitive processing and emotion response influence each other reciprocally during decision-making (Schwarz & Clore, 1983; Isen & Patrick, 1983; Forgas, 1998). In this experimental study we seek to better understand the interactions between them in a specific context of negotiation. We measure emotional response in situations of gains and losses, and their consequences for risk taking. Results are compared with work by Van Dijk and Zeelenberg (2006), which show a moderating effect of uncertainty on the intensity of emotions, and confirm the Prospect Theory (Kahneman and Tversky, 1979).