Ever heard someone telling you they were hearing voices in there head?
You probably thought they were crazy right?
Well you had every reason to be sceptical since what I am about to show you has only been depicted in science fiction.
The technology is not very new, and it has been around since the 1960s.
Using an ultrasound wave you can actually shoot a directional sound wave at a subject. They will be the only person able to hear this sound.
The technology has been dubbed an audio spotlight.
Here is an ABC news special that talked about this technology back in 1985
Here is a college professor explaining the technology to his students.
And here the company Heineken uses this technology to entice customers!
So next time someone tells you they are hearing voices you may be less apt to dismiss there claims as a psychological disorder.