Like Blackberry, I’d do it for experiment purposes, but that’s it.
I mistrust the possibility of technology to accurately represent and interpret people’s thoughts.
Thoughts aren’t straightforward things. Sometimes they are, maybe, like if someone asks me if I murdered John and I say “no” although I’m actually thinking “yes, I did murder him.” But how often does that really happen, even in legal-type situations? Thoughts aren’t even always put into sentences, into words – they can be sensations, images, memories, associations, sounds, vague things requiring an understanding of the thinker’s psyche in order to possibly begin interpreting them. They can be jokes only the thinker gets, or a reaction to stress, or anything at all!
For example, if a vivid image of a cat being tortured comes into my mind, maybe technology could pick up on that image (a stretch, even by the article you linked to), but it couldn’t say what that image meant – it couldn’t explain the thought. For instance, is it a memory? If so, is it one I was personally involved in, witnessed first-hand, witnessed on TV, saw in a fictional movie? Or is it fantastical, something I came up with? If so, is it a positive fantasy for me, or nightmarish? Does it have any relation at all with what I might actually do in the world? Not necessarily.
Anyway, the article wasn’t even about reading thoughts, although one of the quotations did say something about that. But the only thing those tests proved was that we could have some insight into what people were seeing or hearing at that particular time. That’s a far cry from reading thoughts – that’s just measuring internal responses to external stimuli, and we’ve been doing that kind of thing for ages. How different is it, really, from putting sensors on a guy’s penis and showing him porn? The only difference is we measure the brain response, not the penile response. Big deal.