What does the theory of solipsism propose?

The theory of solipsism posits that only one's own mind is sure to exist, leading to the conclusion that the self is the only certainty one can rely upon. In this philosophical position, external realities or other minds cannot be known or proven to exist outside of one's own consciousness. Solipsism emphasizes the idea that knowledge is confined to the individual's subjective experience, inherently isolating the self in a kind of epistemological vacuum. This makes it a unique position in philosophy, focused solely on the individual's perception and understanding of existence.

The other options, while touching on different philosophical concepts, diverge from the essence of solipsism. The notion of uncertainty regarding the external world connects more closely with skeptics who raise questions about perception and reality but doesn't imply the singular existence of the self. The idea that knowledge is limited to sensory experiences aligns more with empiricism, which acknowledges an external world that can be experienced but does not support the solipsistic claim that only the self is knowable. Finally, the perspective that all knowledge is socially constructed relates to social constructivism, emphasizing societal influences on understanding rather than the introspective focus of solipsism.