Hi,
it's written in SDM Tutorial: " While different studies may employ different thresholds, you should ensure that the same threshold throughout the whole brain was used within each included study ".
So, if in some studies, I found that:

"Task-related responses were generally
considered significant if they consisted of at least 5 contiguous
voxels that exceeded an uncorrected threshold of P < 0.001,
although in a few cases, when exploring details of individual
differences, we used a more liberal threshold, P < 0.005."

Can't I use those studies to conduct a meta-analisys?

Best regards.
Roberta

Dear Roberta,

the short answer is that you should discard them. However, if you manage to know which of the clusters obtained using P < 0.005 would not be obtained using P < 0.001, then you include the studies but discard these clusters. The problem is that knowing this may not be straightforward...

Hope this helps,

Joaquim