I do this all the time and I've always wondered how many other people's brains do the same thing. This was a brilliant blog idea. Memories and emotions can be triggered in so many different ways like through scent, sound, sight (all the senses basically) and I get a mix of all of them. My memories around games are mostly defined by the season of the year I play them, whatever the weather is, the music I'm listening to at that moment, and sometimes smells get mixed in as well. My brain pulls all these different stimuli together to make as "whole" of memories as possible, to likely paint the most distinct picture in my head, and make it easier to remember.
In regards to the music sensory trigger theme you have, I associate music with my particular game experiences all the time. For example whenever I listen to the Finnish metal band Children of Bodom I always think of the Halo series in general because I made memories listening to them while I played. When I listen to Korn I think of Gears of War. I think of Half Life 2 whenever I listen to the dance/pop band Groove Coverage.
I'll usually remember the season and weather too, so my memories of Portal 2 involve the green, rainy, cloudy image of spring since it was spring time here in Colorado when I got the game. Scent triggers are extremely common in memory creation and such studies have shown. I can smell a particular food dish like baked shells with cheese, and it transports me back to being in after-school care when I was in elementary school, because my teachers made that dish for us and it left an impact on my brain. Getting to the scent triggers I mentioned, one example of those in regard to gaming is that there's a particular brand and scent of disinfectant spray/air sanitizer, and whenever I smell that air sanitizer it triggers memories of Halo 3 specifically. The reason why is because I've often bought that brand of stuff, and way back in 2007 when I was playing Halo 3 for the first time I had to take a break to clean my room and I used that air sanitizer when I was cleaning my room. My memories are quite robust, detailed, and pull information from lots of sources and senses.
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