Lots of them use specific sounds and frequencies to induce desired states in the brain and have applications including anti-shoplifting, creating harmonious states in multiple humans and some can cause sexual arousal.
Remote system that transmits a specific radio wave signal designed to interfere with the brain's activity in a way that yields readable results as to the brain's state that can then be analysed.
Reduce the activity of the brain with sound waves at 4-16Hz.
A set of stimulus sound waves to induce multiple brain different states are referenced.
A more effective way to induce brain states using sound, I.E. by causing desired sleep states.
A patent on the synchronicity of converging tempos of recorded speech causing a specific positive emotional reaction.
Stimulating attentive brain states (like FM Theata) using a specific recorded sound superimposed on a 20hz sound wave.
Potentially evidence of speech parsing models in something that looks like a lie detector test or an assessment for psychological illness.
Portable acoustic device that can cause sleepiness, or sexual arousal etc.
Use things like music, from a traditional speaker or an LRAD, or any other existing vibrational mechanism, to cause "Harmonious States". Potentially a real version of Cupid's bow and arrow.
A catalog of recorded emotions by brainwave state, and their related facial expressions, potentially indicating a work on a digital map of emotions (in the form of an ai model). This could later be used to figure out which of a wide array of variables can later be adjusted or controlled to induce the specific emotions. It could also be used to assess people out of reach by using cameras watching facial expression.
Using electrodes on the scalp to monitor and induce desired brain states.