Some are more prone to disassociate then others. You can take two kids, put them through the exact same situation/trauma....and the reaction won’t be the same....this is even so with identical twins that are born of the same egg.
I found this:
https://www.theguardian.com/science/...t-health-study
Quote:
It is a baffling observation: individuals with identical genes and often very similar conditions of ubringing but who experience very different life outcomes. What could be the cause? The answer, says Spector, came to him in a Damascene moment four years ago. The causes of these differences were due to changes in the human epigenome, he realised.
"Essentially, epigenetics is the mechanism by which environmental changes alter the behaviour of our genes," he says. "This involves a process known as methylation, which occurs when a chemical known as methyl, which floats around the inside of our cells, attaches itself to our DNA. When it does so, it can inhibit or turn down the activity of a gene and block it from making a particular version of a protein in our bodies." Crucially, all sorts of life events can affect DNA methylation levels in our bodies: diet, illnesses, ageing, chemicals in the environment, smoking, drugs and medicines.
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So maybe because we are shaped from the get go from things beyond our control. How about the mother’s body chemistry....like the things that she ingests good and bad like food and drink, medicine, vitamins, smoking, or illicit drugs; things she absorbs through the skin from her environment; maybe even emotions releasing certain hormones; could be anything dousing the embryos in varying amounts.