2.5 Statistical analysis
After checking for normality and homoscedasticity of the distribution of the variables, for the behavioral data we performed a one-way repeated measures analyses of variance (ANOVA) with the Condition factor at three levels (Keypress , Reaching , Reaching-Stepping ). For ERP data, we used a 3x2 repeated measures ANOVAs with the Condition factor (Keypress , Reaching , Reaching-Stepping ) and Interval (early, late) factor. The alpha threshold was set to 0.05. The partial eta squared (ηp2) was reported as a measure of effect size. The Bonferroni post-hoc test was used to compensate for the multiple comparisons. The Statistica 11 software (StatSoft Inc., Tulsa, OK, USA) was used for statistical analysis.
Results