Key result
Contralateral motor execution uniquely increases somatosensory motor cortex oxygenation compared to motor imagery.
Why the study?
The topographical localization of motor-related regional hemodynamic signal changes during motor execution and motor imagery using near-infrared spectroscopy was unclear.
Does motor imagery produce similar regional hemodynamic signal changes as motor execution in healthy adults?
Cross-Sectional (n=20)
No
Does motor imagery produce similar regional hemodynamic signal changes as motor execution in healthy adults?
p-value: p=0.018
NIRS can detect topographical localization of motor-related regional hemodynamic signal changes, demonstrating that the supplementary motor area and premotor area are similarly activated during both motor execution and motor imagery.
NIRS maps distinct motor-area hemodynamics during imagery versus execution in healthy adults; leaves open translation to neurorehabilitation protocols.
The aim of this study was to clarify the topographical localization of motor-related regional hemodynamic signal changes during motor execution (ME) and motor imagery (MI) by using near-infrared spectroscopy (NIRS), as this technique is more clinically expedient than established methods (e.g., fMRI). Twenty right-handed healthy subjects participated in this study. The experimental protocol was a blocked design consisting of 3 cycles of 20 s of task performance and 30 s of rest. The tapping sequence task was performed with their fingers under 4 conditions: ME and MI with the right or left hand. Hemodynamic brain activity was measured with NIRS to monitor changes in oxygenated hemoglobin (oxy-Hb) concentration. Oxy-Hb in the somatosensory motor cortex (SMC) increased significantly only during contralateral ME and showed a significant interaction between task and hand. There was a main effect of hand in the left SMC. Although there were no significant main effects or interactions in the supplemental motor area (SMA) and premotor area (PMA), oxy-Hb increased substantially under all conditions. These results clarified the topographical localization by motor-related regional hemodynamic signal changes during ME and MI by using NIRS.
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Iso et al. (2016) conducted a cross-sectional in Healthy subjects (n=20). Motor execution and motor imagery of a tapping sequence task vs. Rest was evaluated on Changes in oxygenated hemoglobin (oxy-Hb) concentration in the somatosensory motor cortex (SMC) (p=0.018). Near-infrared spectroscopy revealed that oxygenated hemoglobin in the somatosensory motor cortex increased significantly only during contralateral motor execution, whereas the supplementary motor area and premotor area were activated similarly during both motor execution and motor imagery.
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