Devices using various techniques to make people feel sensations such as bugs crawling on the skin. They rely on electrical pulses, magnetic pulses, or air pulses (such as sound), applied to the person's skin using frequencies such as 1/2hz and 2.4hz to create a sensation that they are feeling something somewhere in their body.
One of the first public patents describing apparatus that allowed people to "perceive" or sense radio waves.
This study apparently shows the development of an invention that can make people perceive physical sensations on/in the body based on weak electrical fields, now in a battery powered device.
Application of the 1/2hz and 2.4hz frequencies being used for causing things like sleepiness or sexual arousal, but using previously mentioned electrical fields, with electrodes in contact with the skin.
Follows on from the weak electric field technique of making someone perceive a sensation on/in the body, now doing it from a short distance with magnets.
This study apparently shows the development of the technology that can make people perceive physical sensations on/in the body and the other related effects mentioned previously based on weak electrical fields, it's now working over a short distance, and using a battery powered device with a magnetic field generating antenna similar to the very short range NFC antennas in a modern phone.
Application of the technology to make people feel sensations on or in their body using directed air pulses, instead of electrical fields.
A technology that allows electrical fields applied to the skin cause sensations. It is now able to cause twitches and tremors on demand.
Device that can cause a sensation or related effects from a remote place nearby on the top of a building for example. Using directional magnetic resonance.
Makes someone feel a sensation or the related effects mentioned earlier from pulses on a computer screen or TV (CRT).