yeah, perception is all about examining the outer world, which includes oneself. inner pictures of ni are representations of the world. there is only one world. only one brain. only one skull. communication takes place inside of it. gets something going. creates resonance. is inspiring.
introversion is about "creative" uniting of as much as possible and examining the intrinsic character of one such united entity, extroversion is about "objective" fragmenting/dividing of the whole into virtual entities and examining the interactive (external) character of those fragments. both get a big picture of everything, just the boundaries are defined differently, and the prediction of the character of the whole is sort of "sidewards". Ni knows what one virtual entity is up to. Ne knows what will happen if virtual entity x meets virtual entity y. both predict different aspects of the future. by virtual i mean, that all boundaries are subjective. their definition is the basic act of perception.
introverted perception grows with experience, but fears to be totally overwhelmed. extroverted perceptions copes with volume of experience by becoming more superficial, remaining very effective, but getting nihilistic.