Thank you, I did watch it.
The classic example is an abused woman being told she's no good, and than later when she hears things like the faucet running or other sounds from when she was hit she gets a headache or feels she is no good.
Well, the scientific response to this suggestion would be "prove it." It's not enough to have a good idea or a concept that allows us to feel like we understand something - it has to be tested somehow.
Of course, one problem is that Hubbard says the effects an engram can have on someone can be random or unpredictable; the "reactive mind" can re-interpret words in different, unpredictable ways. One Scientology video claims a mother telling a sick child "I will never leave you" has instilled an engram for the sickness to never leave them, causing them to feel sick when the engram is triggered by similar environmental stimulus.
This can lead to engrams being about as predictive as something causing "bad luck". It's not necessarily predicting a specific result, people will find their own cause-effect relationship in auditing and that will make the engram go away.
This is unfortunate. The thing we want to discover is only available as "hindsight matching." As with the bible code and numerology, we create the pattern only after we know the right answer.
It doesn't quite square with how memory is thought to work however. First, because (at least in the video) the incidents capture things that are too specific while still being too general. I am supposed to think that specific words are retained, along with the more general background (like the motorcycle and faucet running). All this while other aspects are disregarded (the height of the ceiling, the color of the carpet, the furniture...). Can it really work like that?
One workaround is to try what you might try with someone claiming to be reincarnated or with the recovered memory folks: see if you can get corroboration through other means. Did it really happen like they recall? If most memories are confabulation to some degree, you'd expect a mismatch.
Many decades after the event, I and my next-youngest sister argued about which of us really got the red plastic firetruck for Christmas when we were kids. I believed it was given to me, she to her. One of us had to be wrong, but each argued about having a strong supporting memory. Then, after our folks had died (and our parents couldn't remember either way), we found some old 8mm footage of that Christmas. It shows our younger sister opening the package containing the firetruck. So we were both misremembering.
But let's say the engram doesn't even have to be accurate to have an effect. It messes up the theory because engrams are supposed to have actually happened - otherwise, there's no association formed to react to.
[in reference to my comment about fMRI]
But aren't a lot of things in psychology not yet found in brain imaging? For example, post traumatic stress disorder. If you image the brains of soldiers coming back from war do you see anything different in those who later develop PTSD?
I don't know. That's the point of doing the experiment, to find out.
I know a little about PTSD and although it does sound similar to engrams, this is only a surface similarity. I'll try to list some differences. Please note these are for the "general case." We want this because there will always be exceptions but for both PTSD and engrams we are interested in a phenomenon that affects the general population - I can't use an exception to make a broad description, I have to use broad terms and see if they fit.
1) For PTSD, the event (or series of events) is known and usually documented. Not so for engrams - you are left taking someone's flawed memory as the only verification.
2) PTSD, despite the lore on "triggering," is an enduring, generalized response with general symptoms - like anxiety and depression. Even if there is a trigger, it will be related to the trauma. That is, gunfire reminds me of being shot at, or thunder sounds like distant artillery. It is not the case that some odd thing (the sound of gravel under my feet) pulls the "trigger." Engrams however, do have this feature - normal stimuli invoke the reactive mind.
3) PTSD is treated by addressing current symptoms directly, and although recounting the trauma may be useful, the tale telling is in no way dredged up from hidden memories, it's overt and front of mind. Engrams rely on unconscious memories that need to be discovered and displayed to the "patient."
4) PTSD patients benefit from networking with others who have experienced the same/similar trauma. Engram treatment is private.
5) Traumatic memories generally do not lead to PTSD, but resolve themselves over the course of one to three months. Time heals. Painful memories fade. For engrams, as I understand it, the memory is retained for a lifetime (possibly longer) unless expunged (cleared).
One further question. How are engrams different from memories? Because I already have a word for memories. Focus on the functional differences and test those. Don't allow the cop-out of, "they are just powerful memories."
Remember, an explanation has to add value, not just relabel what we know with new terms.