standard high-level philosophy term
In its classic formulation, solipsism refers to a state of existence in which the only person who is conscious is “oneself”, which resides in the body of an individual human over time. A more general version of solipsism involves crossing it with personal identity views (see above). Through this lens, the classic person-centric formulation of solipsism refers exclusively to a Closed Individualist universe. Alternatively, Open Individualism also has a solipsistic interpretation – it is thus compatible with (and in at least in one sense entails) solipsism: the entire multiverse of experiences are all experiences of a single solipsistic cosmic consciousness. With an Empty Individualist universe, too, we can have a solipsistic interpretation of reality. In one version you use epiphenomenalism to claim that this moment of experience is the only one that is conscious even though the whole universe still exists and it had an evolutionary path that led it to the configuration in which you stand right now. In another version, one’s experience is the result of the fact that in the cosmic void everything can happen. This is not because it is likely, but because there is a boundless amount of time for it to happen. That is, no matter how thin its probability is, it will still take place at some point (see: Boltzmann brain). That said, one’s present experience -with its highly specific information content- being the only one that exists seems very improbable a priori. Like imagining that despite the fact that “the void can give rise to anything” the only thing that actually gets materialized is an elephant. Why would it only produce an elephant, of all things? Likewise, solipsistic Empty Individualism has this problem – why would this experience be the only one? To cap it off, we can also reason about solipsism in its relation to hybrid views of personal identity. In their case solipsism either fails, or its formulation needs to be complicated significantly. This is partly why the concept of the Goldilocks Zone of Oneness (see above) might be worth exploring, as it may be a way out of ultimate solipsism. On a much more proximal domain, it may be possible to use Phenomenal Puzzles, Wada tests, and ultimately mindmelding to test the classical (Closed Individualist) formulation of solipsism.