Editing Solipsism (section)

===Falsifiability and testability===
Solipsism is not a [[falsifiable]] hypothesis as described by [[Karl Popper]]: there does not seem to be an imaginable disproof.<ref>{{cite book|last1=Popper|first1=Karl|title=Knowledge and the body-mind problem: in defence of interaction|date=2000|publisher=Routledge|location=London|isbn=0-415-13556-7|page=106|edition=Repr.}}</ref> According to Popper: a hypothesis that cannot be falsified is not scientific, and a solipsist can observe "the success of sciences" (see also [[Scientific realism#No miracles argument|no miracles argument]]). One critical test is nevertheless to consider the induction from experience that the externally observable world does not seem, at first approach, to be directly manipulable purely by mental energies alone. One can indirectly manipulate the world through the medium of the physical body, but it seems impossible to do so through pure thought ([[psychokinesis]]). It might be argued that if the external world were merely a construct of a single consciousness, ''i.e.'' the self, it could then follow that the external world should be somehow directly manipulable by that consciousness, and if it is not, then solipsism is false. An argument against this states that this argument is circular and incoherent. It assumes at the beginning a "construct of a single consciousness" meaning something false, and then tries to manipulate the external world that it just assumed was false. Of course this is an impossible task, but it does not disprove solipsism. It is simply poor reasoning when considering pure idealized logic and that is why [[David Deutsch]] states that when other scientific methods are used also, (not only logic), solipsism is "indefensible", also when using the [[Occam's razor|simplest explanations]]: 
"If, according to the simplest explanation, an entity is complex and autonomous, then that entity is real."<ref name="deutsch" />

The method of the typical scientist is naturalist: they first assume that the external world exists and can be known. But the scientific method, in the sense of a predict-observe-modify loop, does not require the assumption of an external world. A solipsist may perform a psychological test on themselves, to discern the nature of the reality in their mind – however Deutsch uses this fact to counter-argue: "outer parts" of solipsist, behave independently so they are independent for "narrowly" defined (''conscious'') self.<ref name=deutsch>Deutsch, David. (1997) ''[[The Fabric of Reality|Fabric of Reality]]''</ref> A solipsist's investigations may not be proper science however, since it would not include the co-operative and communitarian aspects of scientific inquiry that normally serve to diminish bias.