I'm not sure. [He'd like to find out though, so he continues, launching into a whole nerdy explanation of AIM Diffusion fields. Exciting stuff!] AIM Diffusion fields are basically just energy our bodies give off as a byproduct of being an esper. It'll manifest differently depending on what your ability is. If you're an electromagnetic esper you radiate an EM field, if you're a pyrokinetic you give off heat.

[There's more to it, like how a congregation of AIM fields can create angels, or the Sisters' neural network, but those are the basics.]

Some technology can mess with it, and some espers have abilities that utilize it in some way, but most of us don't use it.