Comparison between image reconstruction results from different DOT methods. X-axis labels indicate the DOT methods used. Error bars indicate the SE. T-value images were calculated from the data merged across different recording dates in this analysis. (a) Mean correlation coefficient between t-value images for HbO and HbR. Data were averaged over two animals. (b) Overlap rate between core activated-area maps for HbO and HbR. Core activated areas were defined by voxels that exceeded the criteria of the top 5% highest and lowest t-values as depicted in Supplementary Fig. 8 in the Supplementary Material. Data were averaged over the two animals, Hb species (HbO and HbR), and tasks (L > R and L < R).