Schacter D L, Badgaiyan R D, Alpert N M
PET Imaging Laboratory, Massachusetts General Hospital, Boston 02114, USA.
Neuroreport. 1999 Jul 13;10(10):2061-5. doi: 10.1097/00001756-199907130-00013.
Using positron emission tomography, we studied changes in the regional cerebral blood flow (rCBF) associated with cross modality (auditory to visual) and within modality visual priming in a word stem completion task. Compared to baseline completion performance and to within modality visual priming, cross modality priming was associated with increased rCBF in prefrontal cortex and decreased rCBF in the left angular gyrus. The results confirm and complement trends observed in a previous study concerning visual to auditory cross modality priming, and suggest that distinct cortical mechanisms may mediate within- and cross modality priming on the stem completion task. The findings are consistent with the neuropsychological data concerning auditory to visual cross modality priming, and indicate involvement of aspects of explicit retrieval and lexical processes in cross modality priming.
我们使用正电子发射断层扫描技术，在一个词干补全任务中研究了与跨模态（听觉到视觉）及模态内视觉启动相关的局部脑血流（rCBF）变化。与基线完成表现及模态内视觉启动相比，跨模态启动与前额叶皮质rCBF增加及左侧角回rCBF减少相关。这些结果证实并补充了先前一项关于视觉到听觉跨模态启动研究中观察到的趋势，并表明不同的皮质机制可能介导词干补全任务中的模态内和跨模态启动。这些发现与关于听觉到视觉跨模态启动的神经心理学数据一致，并表明明确检索和词汇加工方面参与了跨模态启动。
