Deng Leyou, Li Qi, Zhang Mang, Shi Puyu, Zheng Ya
Department of Psychology, Dalian Medical University, Dalian, China.
Beijing Key Laboratory of Learning and Cognition, School of Psychology, Capital Normal University, Beijing, China.
Psychophysiology. 2023 Mar;60(3):e14201. doi: 10.1111/psyp.14201. Epub 2022 Nov 13.
Uncertainty can be fractioned into risk and ambiguity psychologically and neurobiologically. However, whether and how risk and ambiguity are dissociated in terms of neural dynamics during value-based decision making remain elusive. The present event-related potential (ERP) study addressed these issues by asking participants to perform a wheel-of-fortune task either during a risky context (Experiment 1; N = 30) where outcome probability was known or during an ambiguous context (Experiment 2; N = 30) where outcome probability was unknown. Results revealed that the cue-P3 was more enhanced for risk versus ambiguity during the anticipatory phase, whereas the RewP was more increased for ambiguity than risk during the consummatory phase. Moreover, the SPN and the fb-P3 components were further modulated by the levels of risk and ambiguity, respectively. These findings demonstrate a neural dissociation between risk and ambiguity, which unfolds from the anticipatory phase to the consummatory phase.
在心理和神经生物学层面，不确定性可被细分为风险和模糊性。然而，在基于价值的决策过程中，风险和模糊性在神经动力学方面是否以及如何相互分离，仍然难以捉摸。本事件相关电位（ERP）研究通过要求参与者在风险情境（实验1；N = 30）中执行幸运大转盘任务来解决这些问题，在该情境中结果概率是已知的，或者在模糊情境（实验2；N = 30）中执行任务，在该情境中结果概率是未知的。结果显示，在预期阶段，提示P3在风险情境下比在模糊情境下增强得更多，而在结果阶段，奖励后正电位（RewP）在模糊情境下比在风险情境下增加得更多。此外，刺激后负电位（SPN）和反馈相关负波（fb-P3）成分分别受到风险和模糊性水平的进一步调制。这些发现表明风险和模糊性之间存在神经分离，这种分离从预期阶段持续到结果阶段。
