描述信息与经验不一致对个体风险选择的影响:决策模型的拟合

The Impact of Description-Experience Conflict on Individual Risky Decision-Making:Decision Model Fitting

采用描述-经验冲突范式,考察损益情境下,描述信息与经验不一致对个体风险选择的影响,通过模型拟合探究其内在机制。研究1a和研究1b采用单因素被试间设计,自变量为描述信息与经验不一致程度,因变量为风险选项选择率。结果发现,获益情境中,描述信息与经验不一致程度的主效应不显著;而损失情境中,风险选项选择率受到显著影响。研究2比较决策模型参数发现,获益情境中,描述信息权重参数ξ和选择一致性参数c显著小于损失情境,而近因参数?显著大于损失情境。这表明,当描述信息与经验不一致时,相对于获益情境,损失情境下个体更大程度地采用描述信息进行决策。研究揭示了损益情境中描述信息与经验不一致影响个体风险选择的机制。

This study used the description-experience conflict paradigm to investigate the influence of description-experience inconsistency on individual risk choices in gain and loss situations, and explore its internal mechanism through decision model fitting. Both Study1a and Study 1b adopted a single-factor between-subjects design. The independent variable was the degree of inconsistency between description and experience, and the dependent variable was the proportion of risky choices(R-rate). Results showed that in gain situations, the R-rate was not significantly influenced by degree of inconsistency between description and experience;while in the loss situations, the R-rate was significantly influenced. Study 2 found that the description’s weight parameter(ξ) in the gain situations was significantly smaller than that in the loss situations;while the recency parameter(?) was significantly larger than that in the loss situations. Therefore, under the condition of description-experience inconsistency, the individuals in loss situations were more inclined to make decisions based on the descriptive information than those in the gain situations.