Conventional psychology condems its believers to solipsism.  P-world theory may look similar at first blush, but it is important not to identify with the P-world.  The P-world is all that is first-person: born of the lawful relation between sensory flux and attendant movement that arises in an animate being.   It brings forth the raw material for a world, but that, alone, could never account for the world we encounter.  Our world, in turn, arises from our collective constitution.  Collective constitution is the means by which we escape the prison of solispsim built by psychology. 

The worlds we encounter are built together.  Our long historical coupling allows our conventional interpretation of function, purpose, and even essence.  I see a telephone.  Without collective history there could be no telephone, just a hard thing.  I sit in a university.  Of course it is real to me, but it is entirely collectively constituted.  Nothing I see makes sense or is interpretable without recognition of how its nature and function have been collectively brought forth.  There is so much more to say, but the esential insight here is that collective constitution is the reason we are not locked into solipsistic worlds.

As an afterthought: this has ramifications for how we interpret neural functioning.  The sturcture and lawfulness we find in brains will never be seperable from the collecitive.  Sometimes this will seem like cultural relativity.  Sometimes like the view from a specific species.  Neural structure and function will never, ever, tell us about a world independent of us, but the notion of “us” will constantly need definition.  For more, see the Credo tab.