Is it "Information" or "Interaction" that "Observes"? First off, I know there are many questions on this forum in regards to "does consciousness collapse the wavefunction" and I admit that this is roughly the same question in a different way. I wanted to approach this in a new topic though because I wanted to focus this question specifically. The question then is in the title. Does the "collapse" occur under "observation" strictly because there is an interaction, or is it because there is an interaction that specifically gives information and what defines "information"? To clarify the analogy we could compared the first case to that of a photon bouncing off of an electron. The "interaction" would thus alter the trajectory/momentum of the electron. A case of "information" would occur if the bouncing off of the photon was measured in order to tell us a bit about the electron's speed or position. I think this question is important because, via our current paradigm, we're a bit biased towards trying to find the most materialistic/deterministic explanation possible (i.e. the one closer to the former situation, where a result is based on a reaction). But going to the double slit experiment, I do not see how we can suppose the effect due to a physical interaction of any sort. Even such an obvious interaction as hitting an electron passing through either slit with a photon does not satisfy the necessary conditions to alter its trajectory through that slit. And furthermore, the slit apparatus itself is within reach of our electron's probability range! It too interacts, but it does not appear to be what determines the trajectory. We then are forced to include that it must be an interaction specifying information, but here's where it gets confusing to me. What is information? The universe has no reason to say that a few dots on a detector foil is "information" as we do. To the universe, the electron hitting the slit shield itself could be "information." The electron bouncing interminably around in the container, getting absorbed, remitted and so on could be "information." I see no reason why, to the universe, the detector foil should not be in a superposition of states even with the measurement device (also in superposition) in front of one slit. If the universe didn't care where the electron was before it hit the foil or "measurer" (a good example of this being the effect-->cause type experiments) then why should we presume it so anthropomorphic to care about the detector foil or our device near the slit? To perhaps go back how I admitted this is largely the age-old question in a different way. It seems to me that we mistakenly attribute our measuring devices as giving information in the universe when, in truth, they are only giving information to us.