Tanguerra, your example of a "silver thread" and going "in and out" as well as how things can go wrong seems to be compatible with my explanation where my explanation is from a meta view where the zygote would mutate, grow, and divide, such as based on someone's karma ... and, should there be problems, then what you described sounds like what the person would experience going in and out of the baby's body as if slipping between consciousness and not sure if the soul should bail on the body, similar to how too much trauma can cause the soul of an adult to become disembodied. Meaning, I'm implying unconsciousness, coma, and death were designed more as a protective mechanism so the soul doesn't suffer too much and can slip into a numb trance while the body attempts to repair itself ... and, the soul can bail if the body is too damaged and the suffering would be too great to continue any further. So, your description of slipping in and out seems to describe the delicate process of the formation of a new body (an embryo) ... such as especially since the new body is in its most fragile and delicate phases.
As such, concerning regression sessions, why not take the earliest memory instead of an average? And, according to you, there has been recorded instances of memories from conception. And, as I've explained in my previous post, it would make sense because of karma should the customization of a body start at zygote since this is a body a soul will be "stuck" with for a lifetime ... therefore should be carefully tailored to that soul lest that soul suffer or gain advantages unfairly as result ... and, based on the logical model of life I've described in other postings and website, life is carefully designed, accurate, and precise ... such as to train souls to become angels one by one through reincarnation.
As far as regression sessions are concerned, I'm reserving my opinion having never experienced one to have an opinion. However, there doesn't seem to be much scientific exploration to try to formalize the details ... such as should some people have memories from conception while others do not, then a scientific curiosity should ask why not? Take someone with memories from 3 months for example ... does that person have any memory of being elsewhere prior to 3 months, meaning is there evidence that the soul didn't enter the body prior to 3 months? Or, might that person be focused on something else such as because memories are only important if they leave an impression? Did something happen that prevented memories from forming? Are there verification of these regression sessions? Are there designed scientific experiments to verify the validity of these memories, such as seeing if a patient can repeat the details of a complex dream for example? ... such as because a true memory can be repeated with a reasonable amount of accuracy.
My statements are based on what I've read from Dr. Brain Weiss's books where he seemed to have recorded the memories of his patients and seemed eager to publish the details and share them with the world ... such as without much hashing and refinement. Whereas, my approach has been doing scientific modelling that logically explains the purpose of the details of life ... and, to my recent delight, I now have a logical model that seems to explain all of the big deals of life, like why there is reincarnation, love, children, gender, sexuality, etc. And, from this model, I've offered the explanation about the customization of a new body based on a soul's karma from the time of the zygote ... because it would only be fair if a body is customized specifically for one soul since that one soul will be living with that body for a lifetime ... so, therefore, all competitions should've ended at conception ... as if souls might act like magnets driving individual sperm cells to see which one can fuse with an egg ... but, once fused, then the race is over and the shaping of the body must start and be focused on the karma of that single soul in order for that body to be properly and fairly shaped based on that individual's karma.
Hopefully, this makes rational sense and describes a well-designed system of life, such as designed by angels.