Li Xiaojian, Wong Donald, Gandour Jack, Dzemidzic Mario, Tong Yunxia, Talavage Thomas, Lowe Mark
South China Normal University, Guangzhou, PR China.
Neuroreport. 2004 Nov 15;15(16):2459-62. doi: 10.1097/00001756-200411150-00005.
The aim of this fMRI study was to identify neuroanatomical substrates of immediate memory underlying phonological processing. To distinguish encoding of immediate memory from rehearsal, participants were required to match tones from the first and last positions of a three-syllable list to their following probes in an immediate-recognition paradigm. The first position task included intervening distractors between the target and probe. Increased activations were found in the left inferior frontal gyrus, right lateral cerebellum, and medial frontal gyrus for the target tone in first position. This network mediates articulatory encoding in immediate-response, and articulatory rehearsal in delayed-response paradigms. These findings support a working memory model in which rehearsal is optional, while encoding is an obligatory component of the phonological loop.
这项功能磁共振成像（fMRI）研究的目的是确定语音处理背后即时记忆的神经解剖学基础。为了区分即时记忆的编码和复述，要求参与者在即时识别范式中，将三音节列表首尾位置的音调与随后的探测音调进行匹配。首位任务在目标音调与探测音调之间设置了干扰项。研究发现，对于首位的目标音调，左侧额下回、右侧小脑外侧和额内侧回的激活增强。该神经网络在即时反应中介导发音编码，在延迟反应范式中介导发音复述。这些发现支持了一种工作记忆模型，即复述是可选择的，而编码是语音回路的一个必要组成部分。
