Thank you!
The OLay and Thr volumes are really beta coefficients and corresponding t-statistic in my case. I found the results (voxels survived) would become exactly same if the p-value threshold in the "Pos button" condition was set to two times bigger than that in the "Pos Only" popup condition. That is, if the p-value threshold is set to 0.05 in the "Pos button" condition, the p-value threshold in the "Pos Only" popup condition must be set to 0.025 to get the same survived voxels. If the p-value threshold was set equally in these two conditions, the results are definitely different. Does that difference come from the difference between one tail or two tails t-test, or something else?



Edited 1 time(s). Last edit at 01/30/2018 02:25PM by Zhang Yu.