Intradimensional discrimination training may cause peak shift, in which participants respond more frequently to a novel stimulus presented during a generalization test than the positive exemplar used in training. Previous research has shown that peak shift is most likely to occur in participants who have achieved an intermediate level of proficiency with the discrimination. We sought to examine whether discrimination learning and peak shift could be altered through variations in stimulus discriminability. An international sample of 117 adults were trained to discriminate one visual representation of risk from COVID-19 (S+) from a second level of risk (S-) that was either lesser or greater. In a high discriminability condition, a single indicator of risk (a bar length) was presented on each trial. In a moderate discriminability condition, participants were required to estimate a person’s risk from multiple risk indicators. In a low discriminability condition, participants were additionally required to consider risk mitigation factors when estimating a person’s risk. Peak shift was absent in the high discriminability condition but present in the moderate condition. The low discriminability condition produced either flat or monotonic generalization gradients. The results additionally demonstrate how presenting health risk information to people in relatively simple or relatively complex ways affects their ability to judge that information correctly.

维度内辨别训练可能会导致峰值偏移，其中参与者对泛化测试期间呈现的新刺激的反应比训练中使用的阳性样本更频繁。先前的研究表明，峰值转变最有可能发生在已达到中等水平的歧视熟练程度的参与者身上。我们试图检查是否可以通过刺激可辨别性的变化来改变辨别学习和峰值偏移。对 117 名成年人的国际样本进行了培训，以区分 COVID-19 (S+) 风险的一种视觉表示与较低或较高的第二级风险 (S-)。在高可辨别性条件下，每次试验都呈现单一的风险指标（条形长度）。在中等可辨别性条件下，参与者被要求从多个风险指标估计一个人的风险。在低可辨别性条件下，参与者在估计一个人的风险时还需要考虑风险缓解因素。在高辨别力条件下不存在峰值偏移，但在中等条件下存在。低可辨别性条件产生平坦或单调的泛化梯度。结果还表明，以相对简单或相对复杂的方式向人们呈现健康风险信息如何影响他们正确判断该信息的能力。在高辨别力条件下不存在峰值偏移，但在中等条件下存在。低可辨别性条件产生平坦或单调的泛化梯度。结果还表明，以相对简单或相对复杂的方式向人们呈现健康风险信息如何影响他们正确判断该信息的能力。在高辨别力条件下不存在峰值偏移，但在中等条件下存在。低可辨别性条件产生平坦或单调的泛化梯度。结果还表明，以相对简单或相对复杂的方式向人们呈现健康风险信息如何影响他们正确判断该信息的能力。