In syncretistic thought, what I know everybody knows, and what I want, everybody wants.
But the hallmark of the egocentric stage is the "centeredness" of one's consciousness. The egocentric mind is the center of all things. What it wants, everyone wants. What it feels, everyone feels. What it sees, everyone sees. What it knows everyone knows, and so forth.
(To see an example of an egocentric thought process please switch to the graphic version.)