<P> George Berkeley's arguments against materialism in favour of idealism provide the solipsist with a number of arguments not found in Descartes . While Descartes defends ontological dualism, thus accepting the existence of a material world (res extensa) as well as immaterial minds (res cogitans) and God, Berkeley denies the existence of matter but not minds, of which God is one . </P> <P> Solipsism is often introduced in the context of relating it to pathological psychological conditions . Austrian psychiatrist Sigmund Freud stated that other minds are not known, but only inferred to exist . He stated "consciousness makes each of us aware only of his own states of mind; that other people, too, possess a consciousness is an inference which we draw by analogy from their observable utterances and actions, in order to make this behavior of theirs intelligible to us . (It would no doubt be psychologically more correct to put it in this way: that without any special reflection we attribute to everyone else our own constitution and therefore our consciousness as well, and that this identification is a sine qua non of understanding)." </P> <P> Solipsism syndrome is a dissociative mental state . It is only incidentally related to philosophical solipsism . The lack of ability to prove the existence of other minds does not, in itself, cause the psychiatric condition of detachment from reality . </P> <P> Some developmental psychologists believe that infants are solipsistic, and that eventually children infer that others have experiences much like theirs and reject solipsism (see Infant cognitive development). </P>

Am i the only person in the world with my name