Ahead of time: Early sentence slow cortical modulations associated to semantic prediction
Ahead of time: Early sentence slow cortical modulations associated to semantic prediction
复制标题
DOI：
10.1016/j.neuroimage.2019.01.005
复制
发表时间：
2019-04-01
期刊：
影响因子：
5.7
通讯作者：
Moris, Joaquin
中科院分区：
文献类型：
--
作者：
Leon-Cabrera, Patricia;Flores, Amanda;Moris, Joaquin
根据预测为基础的帐户的语言理解，传入的上下文信息是不断地用来指导预激活的最可能的延续展开的句子。然而，在句子理解过程中，这些预测的建立仍然缺乏证据。使用事件相关脑电位，我们调查了持续的过程中语义预测在线句子理解。为了解决这个问题，参与者阅读句子与不同程度的上下文约束一个字的时间。在最后一个词之前有一个1000 ms的间隔，这个间隔可以是一致的，也可以是不一致的。一个缓慢的持续的消极情绪逐渐发展的过程中的句子，显示出不同的条件下，越来越大的振幅比低水平的限制。在结束词之前的间隔中效果最大。这段时间引起了一个左优势慢负电位与梯度幅度调制上下文的限制，复制以前的结果在言语理解。我们认为，这些缓慢的电位表明了与语义预测相关的认知操作的参与。此外，我们复制了N400效应（不一致减一致）的早期发作的高相对于低上下文约束的发现，这表明促进处理上下文支持和高度预期的话。总之，这些结果与基于预测的语言理解模型是一致的，他们也加强了调查缓慢的组件作为潜在的指标与语言预测机制的价值。
According to prediction-based accounts of language comprehension, incoming contextual information is constantly used to guide the pre-activation of the most probable continuations to the unfolding sentences. However, there is still scarce evidence of the build-up of these predictions during sentence comprehension. Using event-related brain potentials, we investigated sustained processes associated to semantic prediction during online sentence comprehension. To address this, participants read sentences with varying levels of contextual constraint one word at a time. A 1000 ms interval preceded the final word, which could be congruent or incongruent. A slow sustained negativity developed gradually over the course of sentences, showing differences across conditions, with increasingly larger amplitudes for high than low levels of constraint. The effect was maximal in the interval preceding the closing word. This interval elicited a left-dominant slow negative potential with a graded amplitude modulation to contextual constraint, replicating previous results in speech comprehension. We argue that these slow potentials index the engagement of cognitive operations associated to semantic prediction. In addition, we replicated the finding of an earlier onset of the N400 effect (incongruent minus congruent) for high relative to low contextual constraint, suggesting facilitated processing for contextually-supported and highly expected words. Altogether, these results are consistent with prediction-based models of language comprehension and they also strengthen the value of investigating slow components as potential indices of mechanisms linked to language prediction.