It’s a self defense mechanism. The subconscious part brain thinks, “Oh, this image caused my heartrate to spike and my breathing to get erratic. That probably means it was a threat to my safety. I had better keep it in the forefront of the memory banks to remind the conscious part of the brain to think up countermeasures so that it doesn’t hurt us if we see it again”
Even if it was something technically harmless like a picture of a war tragedy from a century ago, the subconscious doesn’t know that, it just reacts to the emotional distress.
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