% we assume that a VMP with 2 maps is loaded and that
% - the two maps use the same type of statistic with
% - the same D.F. parameter (no need to convert to p-values)

% first we create a third map within the VMP container
vmp.Map(3) = vmp.Map(1);

% then we can rename this map
vmp.Map(3).Name = [vmp.Map(1).Name ' (conj) ' vmp.Map(2).Name];

% and then we apply the conjunction formula
vmp.Map(3).VMPData = conjval(vmp.Map(1).VMPData, vmp.Map(2).VMPData);

% in case the VMP is also loaded (or to be loaded) in the GUI
vmp.Browse;
neuroelf_gui('setcstatmap', 3);