We introduced a BOLD Index in this abstract. This index can figure out the false positive/non-BOLD voxels from standard fMRI t-test results. It can also provide detailed cortex active patterns. The BOLD Index high value is always marked on gray matter, while, the t-test high value is marked on the CSF or vein in cortex fissure or sulci. T-test answers the question of which voxel is active. The BOLD index tells whether the voxel's response is true BOLD or non-BOLD and how strong.