--Original published at Alex's Thoughts
I think that memory is a fickle thing. How the memory is experienced depends on the viewpoint of the person who is the subject of the memory. While someone may remember an event a certain way, other people who witnessed the same event at the time may have different associations with it, or remember the events occurring slightly different. As such, the experiences and memories that one has of life would appear to be entirely subjective to the person. As for why certain events appear to be set in memory stronger than others, I believe that hindsight is the best means for gauging this.
In particular, a personal experience that I remember like it was yesterday was when I decided I wanted to become an engineer. I was assisting my father in disassembling a tractor engine under a warm June sun. I was having a bit of difficulty getting the head off the engine, so he gave me some advice on loosening the bolts and told me that if another man created it, I should never be afraid to disassemble or work on a machine. He told me that I was just as capable as anyone who created the machine, so I shouldn’t underestimate my ability to work with machines in general. I went to sleep that night with the thought in my head, “If I can work with machines, why shouldn’t I be able to design them?” I began researching my career options, and soon settled on engineering as my desired career path. I believe that if I had not decided to become an engineer, I would merely have filed this memory away as a fond experience with my dad. However, hindsight has set this memory as the moment I made a life-altering decision, for better or worse.
My theory is that in hindsight, memories that correspond to important events in our current life are the ones that stand out the strongest. For example, a person that is stranded on a desert island would have little use for memories about enjoyable movies they saw as a teenager, but be attempting to recall any survival information they’ve absorbed over their life. In my example, this memory serves as the basic structure to why I became an engineer as I am actively pursuing a degree in Engineering. As for a means to measure this phenomenon, I’d interview participants about their current status in life. This includes everything ranging from marital status to income stability. I’d then ask what 3 memories stand out the strongest to them after talking about their life. In theory, the most prevalent events occurring in their life should prompt a memory related to the event to stand out above the rest. For example, if a subject is getting married, an event that would most likely stand out to them is when they met their significant other. If they are dissatisfied with their current job, a memory that might stand out is that one opportunity that may have worked if they had taken it. If correlations like this are present in a majority of subjects, then my theory that current events hold some influence over how strongly we perceive certain memories is validated.
Memory is strange, but it is an essential part of how humans interact and learn throughout life.