Institute of Neuroscience and Medicine (INM-1, INM-2), Research Center Jülich, Germany.
Hum Brain Mapp. 2014 Jan;35(1):61-74. doi: 10.1002/hbm.22151. Epub 2012 Aug 30.
Expectations and prior knowledge are thought to support the perceptual analysis of incoming sensory stimuli, as proposed by the predictive-coding framework. The current fMRI study investigated the effect of prior information on brain activity during the decoding of degraded speech stimuli. When prior information enabled the comprehension of the degraded sentences, the left middle temporal gyrus and the left angular gyrus were activated, highlighting a role of these areas in meaning extraction. In contrast, the activation of the left inferior frontal gyrus (area 44/45) appeared to reflect the search for meaningful information in degraded speech material that could not be decoded because of mismatches with the prior information. Our results show that degraded sentences evoke instantaneously different percepts and activation patterns depending on the type of prior information, in line with prediction-based accounts of perception.
预期和先验知识被认为支持了传入感觉刺激的感知分析，这是预测编码框架所提出的。本 fMRI 研究调查了先验信息对解码退化语音刺激时大脑活动的影响。当先验信息能够理解退化的句子时，左中颞叶和左角回被激活，突出了这些区域在意义提取中的作用。相比之下，左额下回（区域 44/45）的激活似乎反映了在与先验信息不匹配而无法解码的退化语音材料中寻找有意义信息的过程。我们的结果表明，退化的句子会根据先验信息的类型立即引起不同的感知和激活模式，这与基于预测的感知解释一致。
