
Question Over the recent years there has been increasing interest in hand-independent right hemisphere contributions to motor control and factors that impact this recruitment. In this context, the right hemisphere has been associated with the transformation of visual information to guide movements in space ( van der Hoorn et al., 2014 , Serrien et al., 2006 ). Yet, empirical evidence regarding this claim has been limited during motor control. For this reason, the current study employed a visually guided force tracking task with varying spatial and temporal control demands to identify hemispheric activation asymmetries during visuomotor control. Method Hemispheric asymmetries were described with respect to the planning and execution of grip force in 19 young, healthy, right-handed participants. Functional magnetic resonance imaging (fMRI) was performed during the planning and execution of several visually guided force courses with the dominant right and non-dominant left hand. Force courses differed with respect to their spatial and temporal processing demands. Results Results revealed that during planning BOLD responses were indeed right-lateralized in a hand-independent manner in areas associated with visuomotor processing. Yet, importantly this right-lateralization was diminished during actual visually guided grip force execution. Instead, left-lateralization was observed in areas associated with the visually mediated online control of force trajectories (intraparietal sulcus, ventral and dorsal lateral premotor cortex). Further, results revealed left-lateralization in the temporoparietal junction associated with the timing of perceptual events. Conclusion The results suggest that the right-hemisphere is not specialized for visuomotor control per se but particularly the planning of spatial movement features in a visuomotor setting. The left hemisphere, on the other hand, seems to be specialized for the visual-based planning of force timing as well as the online control of visually guided force production. Complementary to the previous literature the here presented results emphasize that the actual movement phase as well as spatial and temporal processing demands are important determinants of hemispheric activation asymmetries during visuomotor control.
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