I was doing a little research because I see the Right Wing using this method to brainwash their viewers and listeners. So here's a snip of what I found:
Snip...
Trained to obey
This issue of authority is central to why most of us are inclined to think 'inside the box'. As Derren points out, 'It's important to learn how to make patterns and generalise but through it we also learn unquestioning suggestibility and authority.
This leads us to accept what societal figureheads such as parents, teachers, tutors and doctors say – and even find ourselves offering their opinions as our own.' It was on this basis, then, that Derren was able to condition the shoppers in the Whitgift Centre to act outside their own free will. 'I used the tannoy as a subtle form of authority,' says Derren. 'As people are not really paying much attention to it, their subconscious takes over.
http://www.channel4.com/entertainment/tv/microsites/M/mindcontrol/subtle/suggestion.html