Introversion is way keep input while it is handled. In that state external stimulation (including social communication) can be interference. Extraversion is a way when data is handled while giving it back.
Everybody has these two functions. Neither of them are related to sociality or definetely...
Put a bucket in the corner of the room. Go to the opposite corner with a coin in your hand. Throw that coin into that bucket. Sound you will hear is what I hear in my head when see a hot woman. This is only way to hear what I am thinking in that situation.