I am reluctant to put my two cents in here, but I do have some relevant experience on this and have formed some theories of my own.
I won't go into my full story, but I have had abduction experiences throughout my whole life. If you want to know more here is my website
Aliendoodles.
My own abductors are a version of the little grey fellows. I say a version because I have witnessed that there are a lot of variations upon the same
theme. Whether this is indicative of different races of one species, or some kind of genetic tailoring. Perhaps it is something else entirely
different: I don't know. I suspect that it is because they are a very developed and old race and have been reshaped by the gravities, solar
radiations, and other pressures of many different and varied colony worlds.
Back to the subject at hand, I have experienced screen memories, paralysis, audio psychic communication, emotional and sensation
transference/communication and also visual psychic communications. I have also been hypnotically regressed on three separate occasions by two
completely different hypnotic regressionists. So I have some experience of a few of the different forms of cognitive manipulation.
I know from experience that the visitors do manipulate minds at a very deep level. The label "screen memories" isn't quite accurate. The images
that the visitors implant are experienced during the abduction and are not the result of some kind post experience mnemonic editing. I have seen giant
owls, cats, muppets, my mother and even my own kids used as disguises. They do this so that we calm down enough for them to open a rapport with our
minds and also to lower our defenses. When we begin to panic, our minds become a seething mess and the visitors are unable to get into our heads to
communicate and calm us down. The visitors communicate with each other on many more levels than we do. We use mainly verbal language, but we also use
body language and observations of the subtle tones of each others voices to analyze the deeper emotional states of our fellow humans. We are able then
to build an accurate linear model of a persons drives and motives so that we can shape appropriate responses and actions while we actively engage in
communication. As a species we are very skilled at audible communication, but our skills are a result of our inability to directly access each others
minds and thoughts. The visitors lack our audio/visual communication skills, but are extremely skilled at deep, direct mind to mind communication. As
a result they are forced to use screen images and deceptions to utilize this skill, otherwise they become effectively mute.
The visitors dip into our memories to find a subtitle non-threatening image to use as a disguise. This doesn't always work, even as a kid the
appearance of a giant monster-munch muppet in my bedroom was obviously out of place, but some times they demonstrate real skill and cunning when
picking a suitable image. The time that I saw my pet cat was such a demonstration. The visitor in question made his presence known by stomping up the
stairs to my attic bedroom. As soon as I realized that something was entering my room my first reaction was to list all of the possibilities. The
least threatening was that my cat was being particularly noisy tonight. As soon as this thought occurred to me I saw my cats head peek out at me from
my stairs. He stopped there for a moment before cautiously sitting at the top of the stairs, to stare at me. There is more to this story and it can be
found on my website, it is just too long to post here. This isn't the only time that the visitors have used this method to gauge the most appropriate
disguise, but I think that I have written enough about screen memories for now. I will end by saying that it is a kind of hypnotism, but hypnotism
from within. They tweek our perceptions from inside our own heads, rather than using external stimulus.
On paralysis, I haven't worked out exactly how they paralyze me, but I think that they use some kind of technology, whether this is implants, radio
waves, scalar waves or intense localized magnetic fields; I don't know.
I believe that it is the result of technological manipulation because of the sensation itself is usually preceded by an intensely loud repetitive
sound that seems to come from inside my own head. The noises vary, from music, to marbles being dropped on a large tin, to birds squawking and even
the sound of an old dial up modem. I think that the noises are a hallucination caused by the visitors scrambling of my motor nervous system. I have
also seen flashing colours that are in time with the noises. My theory is that the electrical pulses are bleeding into my audio and visual nervous
systems.
On Abduction amnesia, I am not sure about the memory loss, but I think that they are either able to effect the way that we store long term memory when
we are around them, or that they are using some kind of space/time manipulation that prevents us from remembering through the virtues of the laws of
causality. Time dilations are supposedly a symptom of alien abduction (although I cannot say that I have experienced them) and if that is so, surely
simply crossing the barrier between different time-streams will subject you to the laws of causality. The most obvious result would be that the events
experienced within the different time-stream would not be carried into your original stream. This could also explain how they can pass through walls,
turn invisible, and also why no-one is able to present substantial physical proof after a close encounter has occurred. After all if they can effect
gravity they can effect space and if they can effect space then to some degree you can manipulate time.
The last part that I have just written is entirely speculation on my part, but it is a theory built upon a lifetime of desperate fishing for some
concrete answers.
I will end by saying that there are a lot of us abductees out there, but many of us are reluctant to post on sites like this one. This is because by
revealing ourselves we are making ourselves the target for a lot of ridicule.
Don't take the lack of rational arguments from our crowd to mean that we don't exist. It is just that many of us have popped our heads up in the
past, just to get shot down again. Those of us that didn't stick our necks out end up glad that we didn't after we see what happens to those that
do.