Is there any way to correct for Nyquist ghost artifact from already acquired EPI data?
Thanks very much.
Dr. Poornima Kumar
Post-Doc Research Fellow
Department of Psychiatry
Tel: 01865 223623
Fax: 01865 251076
From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of Ben Becker [[log in to unmask]]
Sent: 04 May 2011 09:33
To: [log in to unmask]
Subject: [SPM] Further statistics on extracted beta values
a question regarding the further statistical analysis of extracted beta-values:
1. I defined the task related network (2 groups of subjects, 3 memory load conditions; the contrast 1/3 load 1 + 1/3 load 2 + 1/3 load 3 vs
implicit baseline was put forward in a one sample t-test)
2. I extracted individual beta values from clusters showing sign. activity in 1 (using marsbar)
The aim of the present study is to compare the two groups of subjects. Now, is it valid to perform further statistical analysis on the extracted beta values? Or should z-values or %-signal change be used?
Thanks in advance,