To determine the relationships among the variables, Pearson’s correlation analyses and a regression analysis with 2000 bootstrapped samples were performed; P-values = 0.050 were considered to indicate statistical significance. Bootstrapping is useful for the analysis of neurophysiological data while correcting for multiple comparisons and data distribution74. All statistical analyses were performed with SPSS 23.0 software (SPSS Inc., Chicago, IL, USA).
