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Skeptics

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    I had no idea that you could have negative dB. I assumed that a vacuum would be 0, and I can't see how it could be quieter than a complete absence of vibration.
    – Ian
    Commented Feb 15, 2013 at 15:19
  • 23
    @Ian dB is a logarithmic scale, so the complete absence would be -∞. 0 dB is defined as the lowest sound level humans can hear. See also Wikipedia on Decibel.
    – gerrit
    Commented Feb 15, 2013 at 15:20
  • BTW. is there any claim of hallucinations beyond auditory ones?
    – vartec
    Commented May 17, 2013 at 20:51
  • @Sklivvz, what would you accept as evidence? Would you accept a reference from a source known for its accuracy and fact-checking?
    – user5582
    Commented May 17, 2013 at 22:42
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    @Sancho I will give the bounty to the best answer. Let's say metastudies > multiple peer-reviewed studies > single peer-reviewed study > well referenced book citation > wikipedia > anything else.
    – Sklivvz
    Commented May 17, 2013 at 22:45