Dear all,

What is non sphercity correction? if I would like to compare to con images from the same subjects. I found some papers used two sample t -test and then said they applied the non sphercity correction. Is this the same as using paired t test?

In SPM when I want to apply this correction, is it the one that says 'independence'? then If I want to correct, I make 'yes'?

thanks

Aser