The Journal of the Society for Psychical Research at the University of Coventry, UK publishes “The Ghost in the Machine” in 1998. The scientific paper by author and engineer Vic Tandy outlines how exposure to infrasound or the so-called “ghost frequency” of 19hz can create hallucinations that some have mistaken for hauntings.
This Day in Halloween: University of Coventry, UK publishes “The Ghost in the Machine” paper on infrasound or "the ghost frequency" in 1998. / Illustration by Atlas Gutierrez