Fig. 3

Correlation between PFC activation level and balance parameters under single task and dual task in the control and MCI groups. Note. A The correlation coefficient matrix of MCI group in single task. B The correlation coefficient matrix of control group in single task. C The correlation coefficient matrix of MCI group in dual task. D The correlation coefficient matrix of control group in dual task. The ordinate represents balance parameters, and the abscissa represents regions of interest. The color blocks represent the correlation coefficient between balance parameters and regions of interest. The range of − 0.7–0 for the color card represents a negative correlation, and the range of 0–0.7 represents a positive correlation. The red color represents greater correlation coefficient and strong positive correlation, and the blue color represents greater correlation coefficient and strong negative correlation. D-ap = the maximal displacement of COP in the AP direction; D-ml = the maximal displacement of COP in the ML direction; RMS = Root mean squared; RMS-ml = Root mean squared in the ML direction; RMS-ap = Root mean squared in the AP direction; 95%AREA = 95% confidence ellipse area; SP = Sway Path; SP-ml = Sway Path in the ML direction; SP-ap = Sway Path in the AP direction. L45 = the left ventrolateral prefrontal cortex (L-VLPFC) and belonged to the left BA45. R45 = the right ventrolateral prefrontal cortex (R-VLPFC) and belonged to the right BA45. L10 = the left frontopolar cortex (L-FPC) and belonged to the right BA10. R10 = the right frontopolar cortex (R-FPC) and belonged to the right BA10. L46 = the left dorsolateral prefrontal cortex (L-DLPFC) and belonged to the left BA46. R46 = the right dorsolateral prefrontal cortex (R-DLPFC) and belonged to the right BA46. L11 = the left orbitofrontal cortex (L-OFC) and belonged to the left BA11. R11 = the right orbitofrontal cortex (R-OFC) and belonged to the right BA11. *p < 0.05, **p < 0.01