Hi,
Sadly, the IR tPAC code was released a bit hastily at the time (a few years back) and indeed the code is different than the other tPAC functions. Also, fixes related to filtering that were very recently made in tPAC were not applied to IR tPAC. Given our limited resources and our view that IR PAC is not a technique with well demonstrated results, we were actually planning on removing this from Brainstorm shortly. This would happen at the same time we fix other issues related to averaging in tPAC.
You're welcome to advocate for keeping this functionality, e.g. by sharing publications that demonstrate its usefulness. This is a bit outside my expertise, but I'd be happy to discuss it again with the group.
Cheers,
Marc