What's Involved: My theory is that the boys were still technically "themselves," but were somehow experiencing each other's lives and controlling each other's bodies through a trade-off of information in their brains. *Ah! ESP! My old favorite topic.* Anything else is just too much, unless you're going to go for their souls being in the wrong bodies. As a soul is not physical or even adequately describable, we'll avoid that.
Now, due to the inability to detect them more than a few centimeters outside the head, "brainwaves," as the episode's title implies, would still not be a reliable method.
In real life.
The thing is, we have a vortex to factor in. Brainwaves do exist; perhaps these electrical signals have somehow been magnified. Also, any sort of connection would probably send all thoughts and signals, just like in the show, rather than a select few.
Still, people's capacities to send and receive such impulses are seemingly nonexistent. Even if "brainwaves" were capable of smoothly traveling through the air to a particular person, there would be no (known) way to accept the call.
*Hey, if you want to know more about Marshall's "Gootee Board," you won't believe what I stumbled upon.* Click here!
Final Verdict: Just maybe (BH.)
I give it this label because if scientists can believe theories based solely on other theories (in turn based on yet other theories, etc.,) then most ESP begins to look credible. The show has the vortex; real life potentially has an undetectable medium to aid as well, i.e., dark matter.
*Personally, I believe in a lot of ESP. This is odd; I am usually the skeptic.*
