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Simultaneous movements of upper and lower limbs are coordinated by motor representations that are shared by both limbs: a PET study by H. Henrik Ehrsson; Eiichi Naito; Stefan Geyer; Katrin Amunts; Karl Zilles; Hans Forssberg; Per E. Roland is a Neuroscience article available to read on EtoBox.

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## Abstract The purpose of this study was to examine the cerebral control of simultaneous movements of the upper and lower limbs. We examined two hypotheses on how the brain coordinates movement: (i) by the involvement of motor representations shared by both limbs; or (ii) by the engagement of specific neural populations. We used positron emission tomography to measure the relative cerebral blood flow in healthy subjects performing isolated cyclic flexion–extension movements of the wrist and ankle (i.e. movements of wrist or ankle alone), and simultaneous movements of the wrist and ankle (a rest condition was also included). The simultaneous movements were performed in the same directions (iso‐directional) and in opposite directions (antidirectional). There was no difference in the brain activity between these two patterns of coordination. In several motor‐related areas (e.g. the contralateral ventral premotor area, the dorsal premotor area, the supplementary motor area, the parietal operculum and the posterior parietal cortex), the representation of the isolated wrist movement overlapped with the representation of the isolated ankle movement. Importantly, the simultaneous movement

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Author

H. Henrik Ehrsson; Eiichi Naito; Stefan Geyer; Katrin Amunts; Karl Zilles; Hans Forssberg; Per E. Roland

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0953-816X)

Published

2000

Language

EN

Field

Neuroscience (Life Sciences)