Fig. 3.

Correlation between changes in cerebral blood flow ($\mathrm{\Delta }\mathrm{CBF}$) and changes in (a) oxy-hemoglobin (${\mathrm{\Delta }\mathrm{HbO}}_2$) and (b) total hemoglobin ($\mathrm{\Delta }\mathrm{HbT}$) concentration during $r\mathrm{TMS}$ on the ipsilateral side of stimulation. The lines correspond to the best linear fit considering the error bars and yielded $R$ values of 0.53 (${\mathrm{\Delta }\mathrm{HbO}}_2$) and 0.47 ($\mathrm{\Delta }\mathrm{HbT}$).