18 Hz ghost frequency

It turns out that the resonant frequency of much of the human body is also close to 19 Hz . Vibrations in Tandy’s chest led to breathing difficulties, which in turn brought about the feeling of dread and the cold sweat.

The key here is frequency: 19hz is in the range known as infrasound, below the range of human hearing , which begins at 20hz.15 Eki 2003

The two test an urban legend that claims that there is frequency around 19 Hz that can produce feelings of discomfort, dread and, yes, even fear. But the thing is, 19 Hz is below the threshold of human hearing, so these feelings are produced without anyone being able to hear the note .