Laboratoire de Psychologie et NeuroCognition, UMR CNRS 5105, Université Pierre Mendès-France, Grenoble, France.
Hum Brain Mapp. 2013 Oct;34(10):2574-91. doi: 10.1002/hbm.22090. Epub 2012 Apr 5.
This functional magnetic resonance imaging (fMRI) study aimed at examining the cerebral regions involved in the auditory perception of prosodic focus using a natural focus detection task. Two conditions testing the processing of simple utterances in French were explored, narrow-focused versus broad-focused. Participants performed a correction detection task. The utterances in both conditions had exactly the same segmental, lexical, and syntactic contents, and only differed in their prosodic realization. The comparison between the two conditions therefore allowed us to examine processes strictly associated with prosodic focus processing. To assess the specific effect of pitch on hemispheric specialization, a parametric analysis was conducted using a parameter reflecting pitch variations specifically related to focus. The comparison between the two conditions reveals that brain regions recruited during the detection of contrastive prosodic focus can be described as a right-hemisphere dominant dual network consisting of (a) ventral regions which include the right posterosuperior temporal and bilateral middle temporal gyri and (b) dorsal regions including the bilateral inferior frontal, inferior parietal and left superior parietal gyri. Our results argue for a dual stream model of focus perception compatible with the asymmetric sampling in time hypothesis. They suggest that the detection of prosodic focus involves an interplay between the right and left hemispheres, in which the computation of slowly changing prosodic cues in the right hemisphere dynamically feeds an internal model concurrently used by the left hemisphere, which carries out computations over shorter temporal windows.
这项功能磁共振成像 (fMRI) 研究旨在使用自然焦点检测任务，检查参与韵律焦点听觉感知的大脑区域。探索了两种测试法语简单话语处理的条件，分别是窄焦点和宽焦点。参与者执行校正检测任务。两种条件下的话语在音节、词汇和句法内容上完全相同，仅在韵律实现上有所不同。因此，这两种条件的比较可以让我们检查与韵律焦点处理严格相关的过程。为了评估音高对半球专门化的具体影响，使用专门反映与焦点相关的音高变化的参数进行了参数分析。两种条件的比较表明，在检测对比韵律焦点时，大脑区域可被描述为一个右侧主导的双网络，包括（a）包括右侧后上颞叶和双侧颞中回的腹侧区域，以及（b）包括双侧额下回、顶下小叶和左顶上小叶的背侧区域。我们的结果支持与时间不对称采样假说一致的焦点感知双流模型。它们表明，韵律焦点的检测涉及左右半球之间的相互作用，其中右半球中较慢变化的韵律线索的计算动态地为左半球同时使用的内部模型提供信息，左半球在较短的时间窗口内进行计算。
