Humans are limited in their ability to perform multiple cognitive-motor tasks in parallel. In eight participants, we examined whether transcranial direct current stimulation (tDCS) to dorsal premotor cortex (PMD) coul...Humans are limited in their ability to perform multiple cognitive-motor tasks in parallel. In eight participants, we examined whether transcranial direct current stimulation (tDCS) to dorsal premotor cortex (PMD) could attenuate a delay of reaction time (RT) while the participants responded to two visual stimuli presented in temporally close succession. We provided anodal, cathodal, or sham tDCS while the participants performed a task requiring two choice responses or a control task requiring two fixed responses. When the interval between the two stimuli was shorter, the RTs were delayed in both tasks, but anodal tDCS shortened them only in the former task, probably by promoting the response selection function of PMD. Non-invasive neuro-modulation to the brain can boost human ability to multi-task.展开更多
目的:探讨经颅直流电刺激(transcranial direct current stimulation,tDCS)干预左背侧前运动皮质(dorsal premotor cortex,PMd)对高水平足球运动员运动疲劳后知觉预测能力的影响。方法:24名国家一级足球运动员在完成60%最大骑行功率(Pow...目的:探讨经颅直流电刺激(transcranial direct current stimulation,tDCS)干预左背侧前运动皮质(dorsal premotor cortex,PMd)对高水平足球运动员运动疲劳后知觉预测能力的影响。方法:24名国家一级足球运动员在完成60%最大骑行功率(Powermax)恒定负荷力竭骑行后,以平衡抵消法接受2 mA tDCS正极刺激左侧PMd 10 min和伪刺激,随后进行视觉搜索任务、预测足球突破过人任务和预测足球罚点球任务测试。结果:足球运动员疲劳后,进行tDCS正极刺激的视觉搜索任务反应时在3(P=0.039)和6(P=0.017)数量型与伪刺激相比显著降低,预测足球突破过人任务的准确率在240 ms条件与伪刺激相比显著增高(P<0.001)。但是视觉搜索任务准确性、预测足球突破过人任务的反应时以及预测足球罚点球任务的准确性和反应时在tDCS正极刺激条件和伪刺激条件之间没有显著差异。结论:tDCS正极干预左侧PMd 10 min能够有效改善高水平足球运动员运动疲劳后的知觉预测表现。tDCS可以作为有效工具在足球运动员运动训练和比赛中用以缓解疲劳造成的知觉预测能力下降。展开更多
Whether the secondary motor areas are involved in simple voluntary movements remains controversial. Differences in the neural substrates of movements with the dominant and the non-dominant hands have not been well doc...Whether the secondary motor areas are involved in simple voluntary movements remains controversial. Differences in the neural substrates of movements with the dominant and the non-dominant hands have not been well documented. In the present study, functional magnetic resonance imaging (fMRI) was used to investigate the hemodynamic response in the primary motor cortex (M1), supplementary motor area (SMA) and premotor cortex (PMC) in six healthy right-handed subjects while performing a visually-guided finger-tapping task with their dominant or non-dominant hands. Significant activation was observed in M1, SMA and PMC during this externally triggered simple voluntary movement task. While dominant hand movements only activated contralateral motor areas, non-domi- nant hand movements also activated ipsilateral SMA and PMC. The results provide strong evidence for the involvement of the secondary motor areas in simple voluntary movements, and also suggest that movements of the dominant hand primarily engage the contralateral secondary motor areas, whereas movements of the non-dominant hand engage bilateral secondary motor areas.展开更多
文摘Humans are limited in their ability to perform multiple cognitive-motor tasks in parallel. In eight participants, we examined whether transcranial direct current stimulation (tDCS) to dorsal premotor cortex (PMD) could attenuate a delay of reaction time (RT) while the participants responded to two visual stimuli presented in temporally close succession. We provided anodal, cathodal, or sham tDCS while the participants performed a task requiring two choice responses or a control task requiring two fixed responses. When the interval between the two stimuli was shorter, the RTs were delayed in both tasks, but anodal tDCS shortened them only in the former task, probably by promoting the response selection function of PMD. Non-invasive neuro-modulation to the brain can boost human ability to multi-task.
文摘目的:探讨经颅直流电刺激(transcranial direct current stimulation,tDCS)干预左背侧前运动皮质(dorsal premotor cortex,PMd)对高水平足球运动员运动疲劳后知觉预测能力的影响。方法:24名国家一级足球运动员在完成60%最大骑行功率(Powermax)恒定负荷力竭骑行后,以平衡抵消法接受2 mA tDCS正极刺激左侧PMd 10 min和伪刺激,随后进行视觉搜索任务、预测足球突破过人任务和预测足球罚点球任务测试。结果:足球运动员疲劳后,进行tDCS正极刺激的视觉搜索任务反应时在3(P=0.039)和6(P=0.017)数量型与伪刺激相比显著降低,预测足球突破过人任务的准确率在240 ms条件与伪刺激相比显著增高(P<0.001)。但是视觉搜索任务准确性、预测足球突破过人任务的反应时以及预测足球罚点球任务的准确性和反应时在tDCS正极刺激条件和伪刺激条件之间没有显著差异。结论:tDCS正极干预左侧PMd 10 min能够有效改善高水平足球运动员运动疲劳后的知觉预测表现。tDCS可以作为有效工具在足球运动员运动训练和比赛中用以缓解疲劳造成的知觉预测能力下降。
基金supported by the National Natural Science Foundation of China (Grant Nos.30128005,30170325 and 30070250)the State Key Basic Research and Development Progrom(Grant No.G1999054000)the Technology Fund from the Ministry of Education of China (Grant No.20010284021)
文摘Whether the secondary motor areas are involved in simple voluntary movements remains controversial. Differences in the neural substrates of movements with the dominant and the non-dominant hands have not been well documented. In the present study, functional magnetic resonance imaging (fMRI) was used to investigate the hemodynamic response in the primary motor cortex (M1), supplementary motor area (SMA) and premotor cortex (PMC) in six healthy right-handed subjects while performing a visually-guided finger-tapping task with their dominant or non-dominant hands. Significant activation was observed in M1, SMA and PMC during this externally triggered simple voluntary movement task. While dominant hand movements only activated contralateral motor areas, non-domi- nant hand movements also activated ipsilateral SMA and PMC. The results provide strong evidence for the involvement of the secondary motor areas in simple voluntary movements, and also suggest that movements of the dominant hand primarily engage the contralateral secondary motor areas, whereas movements of the non-dominant hand engage bilateral secondary motor areas.
