Laboratory of Social Psychology, Department of Behavioral Science, Faculty of Letters, Hokkaido University, Sapporo, Japan.
Int J Neurosci. 2009;119(8):1170-8. doi: 10.1080/00207450802174472.
Decision under ambiguity (uncertainty with unknown probabilities) has been attracting attention in behavioral and neuroeconomics. However, recent neuroimaging studies have mainly focused on gain domains while little attention has been paid to the magnitudes of outcomes. In this study, we examined the effects of the sign (i.e., gain and loss) and magnitude of outcomes on ambiguity aversion and the additivity of subjective probabilities in Ellsberg's urn problem. We observed that (i) ambiguity aversion was observed in both signs, and (ii) subadditivity of subjective probability was not observed in negative outcomes.
在行为和神经经济学中，对模糊情境（概率未知的不确定性）下的决策一直备受关注。然而，最近的神经影像学研究主要集中在收益领域，而对结果的大小关注较少。在这项研究中，我们考察了结果的符号（即收益和损失）和大小对 Ellsberg urn 问题中模糊厌恶和主观概率可加性的影响。我们发现：（i）模糊厌恶在两种符号下都存在；（ii）在负面结果下，主观概率不具有可加性。
