Memories

 What are memories?

Things we remember in general. Short term, long term. Information of things, places, names, faces, skills, feelings, etc.

How accurate is it?

Not very. tons of variables influence it.

If you have a tumor or damage to the brain, you may forget the past or be unable to make any new ones.

Your mood, experiences, and environment also affect your memories of an event due to individual perceptions. 

I have personally had zero recollection of certain events in my life until someone told me about it or I saw a photograph and decided to make a connection with it. And suddenly, memories I never had are fresh like they just happened yesterday. Did I choose what to believe and what to remember? I believe so (haha this answer is exactly proof). 

In a sense, our brain is so powerful (and malleable) that you can actually put anything you want into it. Of course, there is also priming (ads and commercials), but such tactics don't work unless you already have an emotional connection with it. Just like seeing coke flashing across my subconscious a thousand times is not gonna make me buy coke if I hate it. I would probably unconsciously feel irritated instead). But, with that said, we do associate things unconsciously too. E.g. if you keep seeing happy people drinking coke, you may start to associate coke with happiness. 

Back to memory, it's not real. It just isn't. It is just a bunch of snapshots of your own creativity and perspective. If you change your perception, your feelings towards certain memories will shift and what you choose to remember will eventually change too. 

What then is unchangeable and real? 

This very moment, unadulterated with any perception, Now.