Dealing with 2 sessions and use of mask

Submitted by lena123 on Sun, 10/16/2011 - 22:36

I am doing a seed region analysis for the entire n-back acquisition in two groups of subjects. I intend to finally compare the groups for differences.

1. Each subject had 2 sessions of n-back runs. I am able to get the seed region based FC maps and Z maps for each session separately. But how can I get a single contrast file from the 2 sessions for each subject?

Forums: 
Resting-state fMRI topics

关于rest的correlation analysis

Submitted by liufeng on Sun, 10/16/2011 - 11:44

管理员好！
最近我们尝试用rest的correlation analysis做量表与reho全脑的相关分析，想看下哪个脑区和量表相关比较显著。然后因为spm中的multiple regression也可以做全脑与量表算相关，又用spm算了下。 我们算的时候将年龄、性别等作为了协变量。
1、可是当我们做完发现，rest的结果和spm的结果基本上不一致，区域差别很明显。就是说基本上没有重叠的脑区，而且存在某个重叠的脑区在rest里是正相关、spm中是负相关。我们研究了好久，还是没有找出原因。只知道rest是用partialcorr做的去协变量。spm是用regress去的协变量。其实partialcorr里面也是用到了回归。我们就是想问下，为什么两个软件做的都是同一件事情可是得到的结果为什么差异这么明显呢？那么哪个结果做出来的比较真实客观呢？

Forums: 
Resting-state fMRI topics