[maxwell]

It is my understanding that sensory perception can be altered via external influences such as electric or magnetic field fluctuations. Supposing that all the wondrous things ol' boy saw out in the corn field were due to a wire or two running hot...

Let's not forget internal influences. Breathalyzers, anybody?

[Quix]

But it evidently takes some pretty sophisticated technology to make a sophisticated image, perception etc.

Vague general feelings may be triggered by this or that frequency or cycle of frequencies, in my understanding. But something more complex is a different matter.