By default, FS uses unsigned (ie, two sided) tests. If you have an a
priori hypothesis about the sign, then you can use a signed test. When
you use a signed test, the p-value is that of the unsigned test divided
by two, ie, it is more significant. When you specify a sign for the MC
correction,
Dear experts:
In examining QDEC results of a contrast of interest, I
noticed the results are mainly in cold color (blue), with only two small
clusters in warm color (red). When I proceeded with Monte Carlo simulation, if
I chose the abs as the sign option in simulation, then no clusters survive
