When low-frequency vibrations reach the body, they stimulate mechanoreceptors in skin, muscles and connective tissue. The signal travels through the vagus nerve and shifts the nervous system from sympathetic (fight/flight) to parasympathetic (rest/heal) mode.
Research has shown that 40 Hz frequencies specifically promote gamma brainwaves linked to focus and coherence. 174 Hz creates a deeper sense of safety — as if the body is reminded that it's okay to let go.