Applied Cognitive Neuroscience Laboratory, Research and Development Initiatives, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
Brain Lang. 2013 Aug;126(2):208-16. doi: 10.1016/j.bandl.2013.05.007. Epub 2013 Jun 22.
In Japan, verbal fluency tasks are commonly utilized as a standard paradigm for neuropsychological testing of cognitive and linguistic abilities. The Japanese "letter fluency task" is a mora/letter fluency task based on the phonological and orthographical characteristics of the Japanese language. Whether there are similar activation patterns across languages or a Japanese-specific mora/letter fluency pattern is not certain. We investigated the neural correlates of overt mora/letter and category fluency tasks in healthy Japanese. The category fluency task activated the bilateral fronto-temporal language-related regions with left-superior lateralization, while the mora/letter fluency task led to wider activation including the inferior parietal regions (left and right supramarginal gyrus). Specific bilateral supramarginal activation during the mora/letter fluency task in Japanese was distinct from that of similar letter fluency tasks in syllable-alphabet-based languages: this might be due to the requirement of additional phonological processing and working memory, or due to increased cognitive load in general.
在日本，言语流畅性任务通常被用作认知和语言能力神经心理学测试的标准范式。日本的“字母流畅性任务”是一种基于日语语音和拼写特点的音位/字母流畅性任务。目前还不确定是否存在跨语言的相似激活模式，或者是否存在日本特有的音位/字母流畅性模式。我们研究了健康日本人的显性音位/字母和类别流畅性任务的神经相关性。类别流畅性任务激活了双侧额颞叶语言相关区域，左侧优势化，而音位/字母流畅性任务导致更广泛的激活，包括顶下区域（左、右侧缘上回）。日本人在音位/字母流畅性任务中出现的特定双侧缘上回激活与基于音节-字母的语言中的类似字母流畅性任务不同：这可能是由于需要额外的语音处理和工作记忆，或者是由于认知负荷增加。
