# phase differences between conical intersections and light-induced conical intersections?

I've read recently about light-induced conical intersections, a phenomenon where conical intersections can be artificially introduced to molecules, and that this can be observed even in diatomic molecules (see for example here and here ). I understand that there are similarities in the way you sketch the crossing of the curves, but I dont understand where and how does the wavefunction changes sign near the light-induced conical intersection version?