: This frequency is near the resonant frequency of the human eye (approx. 18 Hz), which can cause vibrating vision that creates "gray apparitions" or peripheral hallucinations.
The use of to induce anxiety and uneasiness is a well-documented phenomenon in psychoacoustics, most famously demonstrated in a 2003 large-scale experiment. While humans typically cannot hear sounds below 20 Hz, these waves can be physically felt and have been linked to intense emotional and physiological reactions. The "Sound of God" Experiment (2003) 17_hz_infrasonidos_para_la_ansiedad_inquietud_t...
: Tandy’s research showed that standing waves at this frequency can cause a sensation of chest pressure and a "feeling of a presence" in the room. Mechanism of Anxiety Induction : This frequency is near the resonant frequency
: Sudden feelings of sorrow, intense anxiety, and "nervous feelings of revulsion or fear". While humans typically cannot hear sounds below 20
In May 2003, researchers in London conducted a mass experiment by hiding a within contemporary music during two concerts.
The study of infrasound and anxiety often references the work of , who identified 18.9 Hz (very close to 17 Hz) as a frequency capable of causing "hauntings".
: Chills down the spine, "shivering on the wrist," and an "odd feeling in the stomach". The "Ghost Frequency" (18.9 Hz)