Building on the seminal studies of Solomon Asch and Muzafer Sherif, recent research has advanced our understanding of the mechanisms underlying social influence by applying a diffusion model analysis. Here, we combined the social identity approach to social influence with a diffusion model analysis to unravel the mechanisms underlying social influence. In particular, we aimed to disentangle whether the difference between in-group and out-group influence on perceptual decision-making is driven by a judgmental bias (i.e., changes in decision criteria) or a perceptual bias (i.e., changes in the uptake of sensory information). Preregistered analyses indicated that in-groups exerted stronger social influence than out-groups because in-groups induced a stronger perceptual bias than out-groups. This finding is in line with the single process assumption of the social identity approach because it implicates that the single process driving social influence (i.e., self-categorisation) translates into a change in a single subprocess of decision-making (i.e., biased information uptake). In conclusion, our results highlight that our theoretical understanding of social influence can be expanded by integrating the social identity approach with a diffusion model analysis.

中文翻译：

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社会影响力和社会认同：扩散模型分析


基于 Solomon Asch 和 Muzafer Sherif 的开创性研究，最近的研究通过应用扩散模型分析，加深了我们对社会影响背后机制的理解。在这里，我们将社会影响力的社会认同方法与扩散模型分析相结合，以揭示社会影响力的机制。特别是，我们的目的是弄清群体内和群体外对感知决策的影响之间的差异是否是由判断偏差（即决策标准的变化）或感知偏差（即吸收的变化）驱动的。感官信息）。预先登记的分析表明，内群体比外群体产生更强的社会影响，因为内群体比外群体引发更强的感知偏差。这一发现符合社会认同方法的单一过程假设，因为它暗示驱动社会影响力（即自我分类）的单一过程转化为决策的单一子过程的变化（即有偏见的信息吸收） ）。总之，我们的结果强调，通过将社会认同方法与扩散模型分析相结合，可以扩展我们对社会影响力的理论理解。