Dear Joaquim,

Thanks to your help, I know the second column ("n1") should be the size of the samples, and no column should be called "n2" if  I'm going to do a meta-analyses that only involve healthy controls. But now I come across a new question. These original studies that met my inclusion criteria have no measure related to effect size (tstatistic, zscore, pvalue, etcetera), and I can't write a "p" for positive peaks (i.e. task > baseline, or patients > controls) and an "n" for negative peaks (i.e. task < baseline, or patients <� controls) as there's no comparesion between two groups. Then how could I prepare the txt files? Is it right if I only list the coordinates of a original study in a txt file?

Yours faithfully,
Youjin Zhao

Dear Youjin Zhao,

if after contacting the authors you cannot retrieve any statistical measure, you might type "p" for positive peaks (e.g. activations) and "n" for negative peaks (e.g. deactivations), e.g.

-22,0,-14,p

Hope this helps,

Joaquim