Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.
Centre d'Économie de la Sorbonne (CNRS & Université Paris 1 Panthéon-Sorbonne), Paris, France.
Elife. 2019 Mar 27;8:e43994. doi: 10.7554/eLife.43994.
The contribution of sensory and decisional processes to perceptual decision making is still unclear, even in simple perceptual tasks. When decision makers need to select an action from a set of balanced alternatives, any tendency to choose one alternative more often-choice bias-is consistent with a bias in the sensory evidence, but also with a preference to select that alternative independently of the sensory evidence. To decouple sensory from decisional biases, here we asked humans to perform a simple perceptual discrimination task with two symmetric alternatives under two different task instructions. The instructions varied the response mapping between perception and the category of the alternatives. We found that from 32 participants, 30 exhibited sensory biases and 15 decisional biases. The decisional biases were consistent with a criterion change in a simple signal detection theory model. Perceptual decision making, thus, even in simple scenarios, is affected by sensory and decisional choice biases.
感觉和决策过程对知觉决策的贡献尚不清楚，即使在简单的知觉任务中也是如此。当决策者需要从一组平衡的选择中选择一个动作时，任何更频繁地选择一个选择的趋势——选择偏差——与感觉证据中的偏差一致，但也与独立于感觉证据选择该选择的偏好一致。为了将感觉偏差与决策偏差分开，我们要求人类在两种不同的任务指令下，用两个对称的选择来完成一个简单的知觉辨别任务。指令改变了感知和选择类别之间的反应映射。我们发现，在 32 名参与者中，有 30 名表现出感觉偏差，15 名表现出决策偏差。决策偏差与简单信号检测理论模型中的准则变化一致。因此，即使在简单的情况下，知觉决策也受到感觉和决策选择偏差的影响。
