It's nice to see some Public Educational Research is actually doing what has already been achieved for years by certain clandestine groups and organisations.
Although I know a few things about Illegal Human research into this subject.
For instance if multiple experimenters use such a system on one human, that subjects brain can become confused and disassociated because of the number of researchers used. In essence it's a way to create a form of Dis-associative Schizophrenia. If experimenters "will" the capacity to self hurt, attack someone in proximity to the subject or become sexually obsessive enough to rape someone in proximity to a test subject, in certain instances the subject if they are not fully aware of the deception could potentially find themselves manipulated to do harm to themselves or others.
In a nutshell, mutliple experimenters generate a "Frankenstein" monster, where a subject is made up of multiple parts consistent with multiple experimenters.
This can lead to some or all of those parts being at odds with one another.
(Incidentally MIT at one point was looking at integrating multiple people's consciousnesses together into one consciousness, I think the intention was to generate a single intelligence built from many. I'm not such what outcome they had with that research.)
However depending on the strength of a subjects pre-conditioning to "Nurture"(Whether they are predominantly good-willed and wouldn't hurt another) will predefine their own capacity to stave off such manipulations by the experimenter(s).
Such tests have been ongoing for years, however the real concern isn't so much the fear of a homeless down and out suddenly being motivated towards violence as an attack, but the concern that any person in politics or any military position could potentially be subverted through the very same system. Rather than fighting wars with two opposing generals, it would be one general creating a public spectacle of a battle theatre with the other general being puppeteered to make all the wrong moves, leading his men to be flank or making decision that bring about dire eugenic consequences to further daemonise the opposition.