Prevents all your ancestors' memories from smashing together. This... is your way out. Here's the problem, your brain is hash. Too many ghosts in your head, too many voices. So how do you fix that? You claw your way back into the stored data, you find unfinished memories, and you crack them open. Finish what you started, until your ancestors have nothing left to show you. THAT is a synch Nexus. When you find it, the Animus can seperate you from your ancestors and bring you back home. Back to your body.
A word of warning; when you step through there, everything changes. But you are still in control and it's up to you to find your way out.