I would argue Ayahuasca ceremonies, a group setting, with experienced individuals who are already open and have very heightened senses and higher than average s

I would argue Ayahuasca ceremonies, a group setting, with experienced individuals who are already open and have very heightened senses and higher than average sensory ability, and cataloguing the experiences individually - and then matching to see if there were shared experiences with specific entities or other beings - would be the research necessary to start creating proof points.