I am interested in comparing two different stimuli classes wordsVhouses and found that when I look at the output for when I have 3dDeconvolve do the comparison and the output for when I do a two sided t-test in ttest++ they are different.
In the first case I compared wordsVhouses as a GLT in my 3dDecon script and then put that subbrick into 3dttest++ as a one sided t-test. In the second case I took the subbrick for words and the subbrick for houses and compared the two in ttest++. The results are similar, but the 3dDecon is noisier and I am wondering why that is, should these be doing something very similar?
Thank you for your help!