Hi,
My name is Chang Xiao. I have been registered in R-fMRI Network. But now I have trouble logging in using my username "lixiangcx". Is there something wrong with my account?
PS: I have a simple question regarding to xjview and slice viewer:
In the xjview and the slice viewer, even if I set the same p value (and the same cluster size), the thresholds are different. Why?
For example:
In xjview, if I set p = 0.01, cluster size = 10, than the intensity is 2.3266.
While in slice viewer, if I set p = 0.01, cluster size = 10, than the intensity is 4.9267. Consequently, the significant clusters are far less than those in xjview. Why threshold should I adopt?
Thanks for your kindness helping and best regards.
Chang Xiao
a network for supporting resting-state fMRI related studies.
Hi Chang,
Hi Chang,
There is a difference between xjview (or SPM) and REST slice viewer:
xjview (SPM) uses one-tailed p value, e.g., it only test patients > controls, and then test patients < controls separately. Thus, two separate comparisons are performed, thus need some procedure to correct multiple comparisons.
REST slice viewer uses two-tailed p value, e.g., test patients > controls and patients < controls at the same time. For a same T value, its p value is twice of the p value of one-tailed test.
Regarding to your account, please try to click "Request new password", or you may need to clear the cookies of your web browser.
Best,
Chao-Gan