Quotation

A flashlight. A kitchen knife. A digital recorder. A cell phone… As his hand closed over this last item, the vaguest outlines of a plan began to come together. === “As best I can tell, the high-frequency sound waves stimulated— in today’s terms— serotonin receptors in the frontal cortex of the brain. Perhaps they acted on the raphe nuclei, as well.” === “What phenomenon was that?” “Unusual sensory manifestations. Odd, unpredictable behavior. Even, in extreme cases, what a psychologist would term ‘dissociation.’  ” “That sounds like a form of schizophrenia,” Logan said. === This haunting had been a discovery by researchers at Coventry University: that extremely low-frequency sound, in the vicinity of 19 hertz, caused feelings of disquiet and dread. A side effect of this infrasound was a peculiar ocular vibration that triggered visions of a shadowy, ghostly apparition.