Tin foil hats and paranoia

Various web sites claim that people believe in the efficacy of tin foil hats and similar devices to stop the voices in their head or prevent the government, paranormal beings, or aliens from reading and/or controlling their minds. These people believe that the foil deflects mind control signals from, for instance, project HAARP, which allegedly transmits mind-control signals from mobile phone towers. These draw on the stereotypical images of mind control operating by ESP or by technological means, like microwave radiation. Belief in the effectiveness of tin foil hats is popularly linked to mental illnesses such as paranoid schizophrenia.