Dire Bare
Legend
The guy who sat in the chair did give him a bit of useful info, though whether that was new info to Rush or if he was just dredging it up from his subconscious if up for debate.
If they're part of his psyche, why do they only appear in the control room?
Because Destiny's bridge is where the crux of Rush's dilemna plays out. He wants to control the ship, he also wants to save everyone and keep them safe, he doesn't trust the competence of anyone else on board, but yet he's becoming increasingly aware he can't do it alone.
Rush himself questions whether his visions are a part of his own psyche or perhaps some manifestation of ancient technology from when he sat in the chair . . . . but the two aren't mutually exclusive.