目的筛选能够在功能性核磁共振造影(functional magnetic resonance imaging,fMRI)上稳定激活Wernicke区的汉语听觉任务刺激模式。方法选用正常右利手中国汉族人10例,采用组块设计,应用西门子SONATA1.5TMRI分别进行不同的汉语语言听觉...目的筛选能够在功能性核磁共振造影(functional magnetic resonance imaging,fMRI)上稳定激活Wernicke区的汉语听觉任务刺激模式。方法选用正常右利手中国汉族人10例,采用组块设计,应用西门子SONATA1.5TMRI分别进行不同的汉语语言听觉刺激任务下的脑功能成像,汉语语言听觉刺激任务分2组:词汇理解组、段落理解组。同时以音乐组作为单纯听觉刺激对照。图像资料经处理后获得脑区激活图。结果音乐组可见双侧颞横回激活,激活以右侧颞叶为主;词汇理解组与段落理解组10例均可见以左颞叶为主的激活(Wernicke区),其中段落理解组激活信号更加强烈,时间-信号强度动态曲线稳定。结论汉语的段落理解任务可以作为临床观察fMRI中激活Wernicke区的听觉语言任务刺激模式。展开更多
Tasks with stimuli are often used for the examination of stimulus-related functional characteristics of brain areas. However, the task can affect the response to a stimulus. Repetition suppression is a phenomenon that...Tasks with stimuli are often used for the examination of stimulus-related functional characteristics of brain areas. However, the task can affect the response to a stimulus. Repetition suppression is a phenomenon that can be used to probe neuronal properties using macroscale functional magnetic resonance imaging (fMRI). The use of repetition suppression as an investigative tool to assess functional characteristics warrants the investigation of the invariance of repetition suppression to a given task. In this study, we examined repetition suppression using images of faces during different tasks. We found that the task difference did not change the response patterns related to repetition suppression in high-level areas and the primary visual area while it changed amplitudes of fMRI response to the visual stimuli. The result suggests that the repetition-suppression phenomenon is robust compared with the amplitude of fMRI response, and functional characteristics can be examined using the repetition-suppression phenomenon even under the condition that fMRI response is varied by task difference.展开更多
任务态功能磁共振成像(functional magnetic resonance imaging, fMRI)是研究针刺效应尤其是针刺即时效应的良好方式。根据任务设计方式不同,对针刺任务态fMRI研究两类四种任务设计类型进行述评,分析各自优缺点,以期为后续针刺任务态fMR...任务态功能磁共振成像(functional magnetic resonance imaging, fMRI)是研究针刺效应尤其是针刺即时效应的良好方式。根据任务设计方式不同,对针刺任务态fMRI研究两类四种任务设计类型进行述评,分析各自优缺点,以期为后续针刺任务态fMRI研究提供借鉴和参考。展开更多
在三个实验中,我们利用功能性磁共振成像(functional magnetic resonance imaging,fMRI)技术考察了在简单特征搜索任务和客体内联合搜索任务中任务维度干扰项的同质性(或称一致性,homogeneity)和任务无关维度干扰信息的同质性对视觉搜...在三个实验中,我们利用功能性磁共振成像(functional magnetic resonance imaging,fMRI)技术考察了在简单特征搜索任务和客体内联合搜索任务中任务维度干扰项的同质性(或称一致性,homogeneity)和任务无关维度干扰信息的同质性对视觉搜索行为的影响及其神经机制。主要探讨了三个问题:(1)任务维度干扰信息的同质性与目标存在性之间交互作用的神经机制;(2)任务维度干扰信息的同质性与任务无关维度干扰信息的同质性之间的交互作用及其神经机制;(3)上述神经机制在不同类型的视觉搜索(特征搜索和联合搜索)中的异同。展开更多
An fMRI-constrained source analysis was applied to investigate visual P300 in the Landolt ring task. To study the localization and relative activation timing of P300 generators, we implemented simultaneous EEG/fMRI to...An fMRI-constrained source analysis was applied to investigate visual P300 in the Landolt ring task. To study the localization and relative activation timing of P300 generators, we implemented simultaneous EEG/fMRI to identify BOLD signal changes and record 64-channel EEG in 10 subjects during a Landolt ring task inside a 1.5-T fMRI scanner using an MR-compatible EEG recording system. MRI artifact sub-traction software was applied to obtain continuous EEG data. Then, the simultaneous collecting of EEG and fMRI was validated in preserving relevant ERPs. The fMRI-constrained source analysis resulted in an 8-dipole solution. The bilateral middle frontal and the right inferior parietal dipole waveforms showed a short latency peak corresponding to the early P300 activity, while the four parietal and the anterior cingulate dipole waveforms showed a long latency peak corresponding to the late P300 activity. The longest latency peak of the anterior cingulate dipole agrees with its role in initiation of motor re-sponse after successful target recognition. Target detection in the Landolt ring task produces the strongest and most extensive parietal activation (especially superior parietal activation), which might be due to its particular visual attention switching.展开更多
文摘目的筛选能够在功能性核磁共振造影(functional magnetic resonance imaging,fMRI)上稳定激活Wernicke区的汉语听觉任务刺激模式。方法选用正常右利手中国汉族人10例,采用组块设计,应用西门子SONATA1.5TMRI分别进行不同的汉语语言听觉刺激任务下的脑功能成像,汉语语言听觉刺激任务分2组:词汇理解组、段落理解组。同时以音乐组作为单纯听觉刺激对照。图像资料经处理后获得脑区激活图。结果音乐组可见双侧颞横回激活,激活以右侧颞叶为主;词汇理解组与段落理解组10例均可见以左颞叶为主的激活(Wernicke区),其中段落理解组激活信号更加强烈,时间-信号强度动态曲线稳定。结论汉语的段落理解任务可以作为临床观察fMRI中激活Wernicke区的听觉语言任务刺激模式。
文摘Tasks with stimuli are often used for the examination of stimulus-related functional characteristics of brain areas. However, the task can affect the response to a stimulus. Repetition suppression is a phenomenon that can be used to probe neuronal properties using macroscale functional magnetic resonance imaging (fMRI). The use of repetition suppression as an investigative tool to assess functional characteristics warrants the investigation of the invariance of repetition suppression to a given task. In this study, we examined repetition suppression using images of faces during different tasks. We found that the task difference did not change the response patterns related to repetition suppression in high-level areas and the primary visual area while it changed amplitudes of fMRI response to the visual stimuli. The result suggests that the repetition-suppression phenomenon is robust compared with the amplitude of fMRI response, and functional characteristics can be examined using the repetition-suppression phenomenon even under the condition that fMRI response is varied by task difference.
文摘在三个实验中,我们利用功能性磁共振成像(functional magnetic resonance imaging,fMRI)技术考察了在简单特征搜索任务和客体内联合搜索任务中任务维度干扰项的同质性(或称一致性,homogeneity)和任务无关维度干扰信息的同质性对视觉搜索行为的影响及其神经机制。主要探讨了三个问题:(1)任务维度干扰信息的同质性与目标存在性之间交互作用的神经机制;(2)任务维度干扰信息的同质性与任务无关维度干扰信息的同质性之间的交互作用及其神经机制;(3)上述神经机制在不同类型的视觉搜索(特征搜索和联合搜索)中的异同。
基金the Natural Science Foundation of Guangdong Province (Grant No. 06028566)
文摘An fMRI-constrained source analysis was applied to investigate visual P300 in the Landolt ring task. To study the localization and relative activation timing of P300 generators, we implemented simultaneous EEG/fMRI to identify BOLD signal changes and record 64-channel EEG in 10 subjects during a Landolt ring task inside a 1.5-T fMRI scanner using an MR-compatible EEG recording system. MRI artifact sub-traction software was applied to obtain continuous EEG data. Then, the simultaneous collecting of EEG and fMRI was validated in preserving relevant ERPs. The fMRI-constrained source analysis resulted in an 8-dipole solution. The bilateral middle frontal and the right inferior parietal dipole waveforms showed a short latency peak corresponding to the early P300 activity, while the four parietal and the anterior cingulate dipole waveforms showed a long latency peak corresponding to the late P300 activity. The longest latency peak of the anterior cingulate dipole agrees with its role in initiation of motor re-sponse after successful target recognition. Target detection in the Landolt ring task produces the strongest and most extensive parietal activation (especially superior parietal activation), which might be due to its particular visual attention switching.
