Glossary
microwave auditory effect
also “Frey effect”
A documented phenomenon in which pulsed microwave or radio-frequency energy is perceived as clicks, buzzes, or hums that seem to originate inside the head, with no external sound. First reported by scientist Allan H. Frey in 1961, it arises through thermoelastic expansion — the pulsed energy causes rapid, minute heating of head tissue, generating a tiny pressure wave that the inner ear detects as sound. It is the real, established basis most often cited in discussions of delivering sound to a person without a speaker.
Related terms: Voice-to-skull, Directed-energy, telepathy