Somatotopic reorganization of hand representation in bilateral arm amputees with or without special foot movement skill
| Autor: | Hongjian He, Chi Shing Zee, Qiao Wei Zhang, Feng Zhao, Xiang Yang Gong, Shi Zheng Zhang, Xiao Jing Yu |
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| Rok vydání: | 2012 |
| Předmět: |
Adult
Male medicine.medical_specialty medicine.medical_treatment Upper Extremity Physical medicine and rehabilitation Amputees Cortex (anatomy) medicine Humans Molecular Biology Motor skill Foot (prosody) Brain Mapping Neuronal Plasticity Resting state fMRI Movement (music) Foot General Neuroscience Motor Cortex Precentral gyrus Hand Magnetic Resonance Imaging medicine.anatomical_structure Amputation Motor Skills Physical therapy Arm Neurology (clinical) Primary motor cortex Psychology Developmental Biology |
| Zdroj: | Brain research. 1546 |
| ISSN: | 1872-6240 |
| Popis: | Bilateral arm amputees usually are excellent foot users. To explore the plasticity of the primary motor cortex in upper-extremities amputees and to determine if the acquisition of special foot movement skill is related with the bilateral hand amputation, we studied the primary motor cortex by using combined task and resting state functional magnetic resonance imaging (fMRI). We investigated 6 bilateral arm amputees with or without special foot movement skill. In the task fMRI study, we found that toe tapping of all the amputees activated the bilateral hand area, including cases without special foot skill. In addition, cases without special foot skill mainly activated the precentral gyrus, which differed from those with more adept foot motor skill who activated both the precentral and postcentral gyri. To further understand the plasticity of the hand area, the resting state functional connectivity was investigated between the foot and hand regions. One-tailed two-sample t -test suggested that the connections between two areas became significantly stronger in the amputee group. Our study demonstrates that hand region of the cortex does not remain ‘silent’ after bilateral arm amputation, but rather is recruited by other modalities such as adjacent or nonadjacent cortexes to process motor information in a functionally relevant manner. From the data presented, it seems that the bilateral arm amputees have a strong potential to develop new skills in their remaining extremities and practice may further enhance this potential. |
| Databáze: | OpenAIRE |
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