Yes, there have been scientific studies of infrasound. I'm no researcher, but the general gist is that only some people are susceptible to it. The low frequencies will generate sensations ranging from unease to panic in only a small percentage of people exposed to it... but for those people, it is very real. So you can't blast infrasound at a party and make everybody freak out. But you CAN blast it at a party and make some people freak out while others wonder what's going on. When you think about it, the second scenario is much more interesting...