I'm trying to understand the delayed choice quantum eraser experiment without consciousness. As I understand it, photons will either interfere or not depending on whether or not "which-path" information is randomly hidden and rendered unkowable to the experimenter. That is, rather the by any particular detector interaction. I have racked my brain for a physical explanation as to why obsfuscating the path info would collapse the wave function without relying on what is "knowable" to a conscious observer. All my attempts invoke circular reasoning. Any help?