This may NOT be far fetch as it seems, after all everyone is surround and emits electric magnetic fields, and this may be what these people are actual sensing including the changes in peoples' electric magnetic fields due to health problems. Don't know about the latter.
Even the whole earth is covered by a magnetic field, it is to protect us from intense solar radiation from the sun, otherwise we will all be burnt to a crisp, even other planets have magnetic fields.
It may be possible ,if one is under too many electrical wires it can interfere with the electric magnetic waves in a person's brain, especially if those wires are above a supposedly haunted house or live too close to a power plant.
Different colors of magnetic fields indicates different radiation levels and strengths.Think of Superman or Supergirl exposed to 'red' kryptonite this red radiation extremely scrambles their magnetic fields in their brains and they become very ballistic.
Not only do planets including the earth have electrical magnetic fields they can be heard as radio signals.Below are two youtube videos of how these planets actually sound like,use your earphones,headphones or external speakers.
click here for How Planets Sound Part one
click here for How Plantets Sound Like part 2
Below is a picture of the Aurora Borealis (Northern Lights) actually one showing of the earth's magnetic fields.
