Brain Activation in Primary Motor and Somatosensory Cortices during Motor Imagery Correlates with Motor Imagery Ability in Stroke Patients
Correlation of percentage BOLD signal change in regions of interest (ROI) during motor imagery and individual MIQ-RS motor imagery ability scores. (a) and (b) show a significant correlation of the kinesthetic imagery subscale scores and the percentage BOLD signal change in areas 4p and 3a, respectively. The plots indicate that higher kinesthetic motor imagery ability correlate with a decreased (and in some cases negative) percentage BOLD signal change in contralesional primary motor cortex (area 4p) and ipsilesional primary somatosensory cortex (area 3a) during imagined actions of the affected hand. Interestingly, the percent BOLD signal change in ipsilesional hippocampus was correlated with both kinaesthetic (closed circles) and visual (open triangles) imagery subcales scores, as shown in (d). (c) show a trend of correlation between percentage BOLD signal change in contralesional area 6 and kinesthetic motor imagery ability scores.