This phenomenon can inhibit speech without inflicting physical pain, and has other excellent characteristics, including: any cognitive effects disappear immediately when the speaker stops speaking, and it is harmless to surrounding people and only affects the speaker. It is generally known that normal production of speech can be interrupted by delaying the sound of the speaker's voice for several-hundred milliseconds and feeding it back so they hear it. The goal of this research was to develop 'SpeechJammer', a system able to act on a person speaking, and forcefully inhibit their speech. The application runs on Windows PCs and Windows Phones. On the other hand, we have published a simple, free application that allows users to experience the speech-inhibiting effect easily.Our research is currently in the initial stages, and the speech inhibiting effect varies greatly with the individual and with accustomization, so it is not ready for practical applications and we have no plans for release or sales.We have created a gun-type prototype combining a directional microphone and directional speaker.We have proposed a concept applying this phenomenon to support communication among people. A person's speech can be inhibited effectively by playing it back the sound of his/her voice in his/her ears, slightly delayed.

Speech zapper effect