"Cult", "brainwashing", "deprogramming", etc. are terms of propaganda used by the dominant culture to combat competing memeplexes.
There is something like manipulation. To make this a discussion about anticipated experience, here is an experiment proposal:
Kidnap a few new members from different religious organizations. (It's just an imaginary experiment.) Keep them for one week isolated from their religious groups: no personal contact, no phone, no books. If they start to do some rituals they were told to do, for example repeat a mantra or sing a song, prevent them from doing so. Otherwise, don't do them any harm, and keep them in a nice environment. -- When the week is over, just let them go. Observe how many of them return to the original group. Compare with a control group of randomly selected people you didn't kidnap; how many of them remained in the group after the week. Are there statistically significant differences for different religious groups?
My prediction is that there would be observable differences for different religious groups. I believe there is some pressure involved in the process of recruitment in some religious (or not just religious) groups; some algorithm which increases the chances of membership when done properly, and fails when interrupted. Perhaps "brainwashing" is too strong word, but it a kind of manipulation. It consists of pushing the person towards more expressions of commitment, without giving them time to reflect whether they really want it (whether it is okay with their other values).
Kidnap a few new members from different religious organizations. (It's just an imaginary experiment.)
This is pretty similar to what the deprogrammers did. They didn't have too high success rates.
Some old SIAI work of mine. Researching this was very difficult because the relevant religious studies area, while apparently completely repudiating most public beliefs about the subject (eg. the effectiveness of brainwashing, how damaging cults are, how large they are, whether that’s even a meaningful category which can be distinguished from mainstream religions rather than a hidden inference - a claim, I will note, which is much more plausible when you consider how abusive Scientology is to its members as compared to how abusive the Catholic Church has been etc), prefer to publish their research in book form, which makes it very hard to review any of it. Some of the key citation were papers - but the cult panic was so long ago that most of them are not online or have been digitized! I recently added some cites and realized I had not touched the draft in a year; so while this collection of notes is not really up to my preferred standards, I’m simply posting it for what it’s worth. (One lesson to take away from this is that controlling uploaded human brains will not be nearly as simple & easy as applying classic ‘brainwashing’ strategies - because those don’t actually work.)
Reading through the literature and especially the law review articles (courts flirted disconcertingly much with licensing kidnapping and abandoning free speech), I was reminded very heavily - and not in a good way - of the War on Terror.
Old American POW studies:
Started the myth of effective brain-washing. But in practice, cult attrition rates are very high! (As makes sense: if cults did not have high attrition rates, they would long ago have dominated the world due to exponential growth.) This attrition claim is made all over the literature, with some example citations being:
a back of the envelope estimate for Scientology by Steve Plakos in 2000:
Iannaccone 2003, “The Market for Martyrs” (quasi-review)
Singer in particular has been heavily criticized; “Cult/Brainwashing Cases and Freedom of Religion”, Richardson 1991:
“Overcoming The Bondage Of Victimization: A Critical Evaluation of Cult Mind Control Theories”, Bob and Gretchen Passantino Cornerstone Magazine 1994:
Gomes, Unmasking the Cults (Wikipedia quote):
“Psychological Manipulation and Society”, book review of Spying in Guruland: Inside Britain’s Cults, Shaw 1994
Anthony & Robbins 1992, “Law, Social Science and the ‘Brainwashing’ Exception to the First Amendment”:
“Brainwashed! Scholars of cults accuse each other of bad faith”, by Charlotte Allen, Lingua Franca Dec/Jan 1998: