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キーワード:
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要旨:
Links between affective states and disorders, and risk-taking and reward sensitivity, are often characterised using summary statistics from serial decision-making tasks. However, our understanding of these links, and the utility of decision-making as a marker of affect, needs to consider that within-task experience of rewarding and punishing decision outcomes may alter future decisions and affective states. We investigated this issue by examining relationships between reward and loss experience, affect, and decision-making in humans using a novel judgement bias task analysed with a novel computational model. Findings included that participants made more pessimistic decisions when recent outcomes were unpredictable, and this effect was greatest in those reporting negative affect. More positive affect was reported when recent and offered decision outcomes were positive, and average earning rate was high. Short-term reward and loss experience can thus influence both future affect and decision-making, and computational modelling may reveal new decision-making markers of affect.
