Abstract：
BACKGROUND:Anatomically and physiologically, there is strong relationship between the brain and body. A new MRI platform covering both the brain and the limb would be beneficial for a more thorough understanding of the brain-body interactions. NEW METHOD:A new arm-over-head (AOH) position was developed to collect MRI of the brain and one arm simultaneously. Subject's tolerability and SNR of both the brain and limb under a serial of seven different TR (250-3000 ms) were tested. Then, blocked motor imagery tasks were performed to test the possible brain-body oscillations. RESULTS:The new MRI position provided structural images with good quality, and the AOH position had the best SNR under TR 3000 ms (p = 0.03 for the brain; p = 0.064 for the limb). Then, by using both hypothesis-free independent component analysis (ICA) and a priori seed-based functional connectivity (FC) analysis, it is demonstrated during motionless motor imagery tasks there existed possible brain-body BOLD oscillations connecting especially arm flexors to default mode, vision, and sensorimotor networks. The FC appeared at network density as low as 5%. COMPARISON WITH EXISTING METHODS:We have developed a new MRI subject position to explore the possibilities of more extensive neuronal and physiological networks. CONCLUSIONS:The results of this preliminary experiment indicate that functional brain networks might extend outside the brain. A bottom-up circulatory effect might explain this phenomenon. Nonetheless, considering the mechanism of neural top-down control and the nature of complex brain networks, the existence of a more extensive whole-body functional network is rational and possible.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Tang IN,Jao T,Huang YA,Li CW,Yu YC,Chen JHdoi
10.1016/j.jneumeth.2020.108829subject
Has Abstractpub_date
2020-10-01 00:00:00pages
108829eissn
0165-0270issn
1872-678Xpii
S0165-0270(20)30252-1journal_volume
344pub_type
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