Review Article

Stimulating the Healthy Brain to Investigate Neural Correlates of Motor Preparation: A Systematic Review

Figure 4

Characteristics of included studies that evaluated the role of supplementary motor area (SMA) and results obtained on reaction time (RT), expressed in standard mean difference (SMD). Negative SMD values correspond to a decrease in reaction time after stimulation whereas positive SMD values correspond to an increase in reaction time after stimulation. Studies reported significant changes in RT after stimulation are illustrated by a red dot. The size of each dot depends on the sample size of the study. B = SMD Becker’s equation; G = SMD Gibbons’ equation; Ref = reference; L = left; R = right; rTMS = repetitive transcranial magnetic stimulation; tDCS = transcranial direct current stimulation; MSO = maximal output stimulator; aMT = active motor threshold; FDI = first dorsal interosseous; EEG = electroencephalography; MRI = magnetic resonance imagery.