Abstract：
Internal forward models hypothesize functional links between motor and sensory systems for predicting the consequences of actions. Recently, the cascaded theory proposes that somatosensory estimation in the inferior parietal lobe (IPL) can be a relay computational structure, converting motor signals into predictions of auditory consequences in a serial processing manner during speech production. The study used fMRI with functional connectivity (FC) analyses to investigate the proposed cascaded processes using three speech tasks: overt articulation (OA), silent articulation (SA) and imagined articulation (IA). The FC results showed that connectivity between aIPL and STG was increased in OA compared with SA, suggesting that the relationship between somatosensory and auditory estimations can be modulated by speech tasks. Moreover, stronger connectivity between IFGoper and pIPL, and between pIPL and STG were observed in SA and IA compared with OA. These results are consistent with a cascaded process in the internal forward models.
摘要：
内部正向模型假设运动和感觉系统之间的功能联系，以预测行为的后果。最近,级联理论提出下顶叶的体感估计（IPL）可以是一个中继计算结构，在语音制作过程中，以串行处理方式将运动信号转换为听觉后果的预测。该研究使用具有功能连通性（FC）分析的功能磁共振成像来研究使用三个语音任务的拟议级联过程：公开发音（OA），无声衔接(SA)和想象衔接(IA)。FC结果表明，与SA相比，OA中的AIPL和STG之间的连通性增加，这表明体感和听觉估计之间的关系可以通过语音任务来调节。此外，IFGoper和pIPL之间的连通性更强，与OA相比，在SA和IA中观察到pIPL和STG之间。这些结果与内部正向模型中的级联过程一致。
