Forster Carina, Stephani Tilman, Grund Martin, Panagoulas Eleni, Al Esra, Hofmann Simon M, Nikulin Vadim V, Villringer Arno
Max Planck Institute for Human Cognitive and Brain Sciences, Department of Neurology, Leipzig, Germany.
Charité - Universitätsmedizin Berlin, Bernstein Center for Computational Neuroscience, Berlin, Germany.
Commun Psychol. 2025 Jun 21;3(1):93. doi: 10.1038/s44271-025-00265-y.
Perception is biased by expectations and previous actions. Pre-stimulus brain oscillations are a potential candidate for implementing biases in the brain. In two EEG studies (43 and 39 participants) on somatosensory near-threshold detection, we investigated the pre-stimulus neural correlates of an (implicit) previous choice bias and an explicit bias. The explicit bias was introduced by informing participants about stimulus probability on a single-trial level (volatile context) or block-wise (stable context). Behavioural analysis confirmed adjustments in the decision criterion and confidence ratings according to the cued probabilities and previous choice-induced biases. Pre-stimulus beta power with distinct sources in sensory and higher-order cortical areas predicted explicit and implicit biases, respectively, on a single subject level and partially mediated the impact of previous choice and stimulus probability on the detection response. We suggest pre-stimulus beta oscillations in distinct brain areas as a neural correlate of explicit and implicit biases in somatosensory perception.
感知会受到期望和先前行为的影响。刺激前的脑振荡是在大脑中实现偏差的一个潜在因素。在两项关于体感近阈值检测的脑电图研究（分别有43名和39名参与者）中，我们研究了（隐性的）先前选择偏差和显性偏差的刺激前神经关联。显性偏差是通过在单次试验水平（可变情境）或逐块（稳定情境）告知参与者刺激概率而引入的。行为分析证实，决策标准和信心评级会根据提示的概率和先前选择引起的偏差进行调整。在感觉和高阶皮层区域具有不同来源的刺激前β波功率分别在个体水平上预测了显性和隐性偏差，并部分介导了先前选择和刺激概率对检测反应的影响。我们认为，不同脑区的刺激前β振荡是体感感知中显性和隐性偏差的神经关联。
