Golestani Narly, Zatorre Robert J
Cognitive Neuroscience Unit, Montreal Neurological Institute, McGill University, Montreal, Canada.
Neuroimage. 2004 Feb;21(2):494-506. doi: 10.1016/j.neuroimage.2003.09.071.
Functional magnetic resonance imaging (fMRI) was used to investigate changes in brain activity related to phonetic learning. Ten monolingual English-speaking subjects were scanned while performing an identification task both before and after five sessions of training with a Hindi dental-retroflex nonnative contrast. Behaviorally, training resulted in an improvement in the ability to identify the nonnative contrast. Imaging results suggest that the successful learning of a nonnative phonetic contrast results in the recruitment of the same areas that are involved during the processing of native contrasts, including the left superior temporal gyrus, insula-frontal operculum, and inferior frontal gyrus. Additionally, results of correlational analyses between behavioral improvement and the blood-oxygenation-level-dependent (BOLD) signal obtained during the posttraining Hindi task suggest that the degree of success in learning is accompanied by more efficient neural processing in classical frontal speech regions, and by a reduction of deactivation relative to a noise baseline condition in left parietotemporal speech regions.
功能磁共振成像（fMRI）被用于研究与语音学习相关的大脑活动变化。十名只会说英语的单语受试者在使用印地语齿龈后卷舌非母语对比进行五节训练课程前后，在执行识别任务时均接受了扫描。在行为方面，训练使识别非母语对比的能力得到了提高。成像结果表明，成功学习非母语语音对比会导致在处理母语对比时所涉及的相同区域被激活，这些区域包括左颞上回、岛叶 - 额盖和额下回。此外，对训练后印地语任务期间获得的行为改善与血氧水平依赖（BOLD）信号之间进行相关性分析的结果表明，学习的成功程度伴随着经典额叶语言区域更有效的神经处理，以及相对于左顶颞语言区域的噪声基线条件，失活减少。
