Although some patients have successful peripheral nerve regeneration,a poor recovery of hand function often occurs after peripheral nerve injury.It is believed that the capability of brain plasticity is crucial for th...Although some patients have successful peripheral nerve regeneration,a poor recovery of hand function often occurs after peripheral nerve injury.It is believed that the capability of brain plasticity is crucial for the recovery of hand function.The supplementary motor area may play a key role in brain remodeling after peripheral nerve injury.In this study,we explored the activation mode of the supplementary motor area during a motor imagery task.We investigated the plasticity of the central nervous system after brachial plexus injury,using the motor imagery task.Results from functional magnetic resonance imaging showed that after brachial plexus injury,the motor imagery task for the affected limbs of the patients triggered no obvious activation of bilateral supplementary motor areas.This result indicates that it is difficult to excite the supplementary motor areas of brachial plexus injury patients during a motor imagery task,thereby impacting brain remodeling.Deactivation of the supplementary motor area is likely to be a serious problem for brachial plexus injury patients in terms of preparing,initiating and executing certain movements,which may be partly responsible for the unsatisfactory clinical recovery of hand function.展开更多
After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement...After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement context in the exploration of its functional significance, and few studies have been conducted in connected movements. Therefore, this study used the cue-induced delayed task paradigm to examine the PMBR change in the motor cortex of the 20 adults when they were moving under the single or connected movements condition. It was found on right-hand movements that the PMBR of the first movement in a connected condition was stronger than that of a single movement, and it was also observed on both left- and right-hand movements that the PMBR of the first movement was stronger than that of the last movement in a connected condition. The results show that the PMBR after the connected movement was stronger than the no movement connection, reflecting that PMBR plays an important role in the preparation of subsequent movements.展开更多
基金supported by the Youth Researcher Foundation of Shanghai Health Development Planning Commission,No.20124319
文摘Although some patients have successful peripheral nerve regeneration,a poor recovery of hand function often occurs after peripheral nerve injury.It is believed that the capability of brain plasticity is crucial for the recovery of hand function.The supplementary motor area may play a key role in brain remodeling after peripheral nerve injury.In this study,we explored the activation mode of the supplementary motor area during a motor imagery task.We investigated the plasticity of the central nervous system after brachial plexus injury,using the motor imagery task.Results from functional magnetic resonance imaging showed that after brachial plexus injury,the motor imagery task for the affected limbs of the patients triggered no obvious activation of bilateral supplementary motor areas.This result indicates that it is difficult to excite the supplementary motor areas of brachial plexus injury patients during a motor imagery task,thereby impacting brain remodeling.Deactivation of the supplementary motor area is likely to be a serious problem for brachial plexus injury patients in terms of preparing,initiating and executing certain movements,which may be partly responsible for the unsatisfactory clinical recovery of hand function.
文摘After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement context in the exploration of its functional significance, and few studies have been conducted in connected movements. Therefore, this study used the cue-induced delayed task paradigm to examine the PMBR change in the motor cortex of the 20 adults when they were moving under the single or connected movements condition. It was found on right-hand movements that the PMBR of the first movement in a connected condition was stronger than that of a single movement, and it was also observed on both left- and right-hand movements that the PMBR of the first movement was stronger than that of the last movement in a connected condition. The results show that the PMBR after the connected movement was stronger than the no movement connection, reflecting that PMBR plays an important role in the preparation of subsequent movements.
