Acoustic radiation pressure

Acoustic radiation pressure is a type of haptic feedback mechanism. It is a creation of inaudible sound, usually ultrasound in nature. A speaker system sets up a specific acoustic wave that creates a difference in pressure density at a given location above it. Modulating the sound carefully around the speaker allows shapes to be made in the air, that exert differing amounts of pressure on anything passed through there ? such as body parts. This replicates the feeling of brushing wind, or a ghostly almost-solid object.

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Acoustic radiation pressure

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Haptics: Pressure
Haptics is the study of the sense of touch. Touch has many parts, but the most basic, the most fundamental of all, is that of pressure.

Cranial Pressure Sensor
Pressure build-up inside the cranium, is one of the most dangerous physical conditions to threaten the brain. In some individuals, fluid build-up is so intense that it risks crushing the brain. Until now, the only way to detect it, has been to drill a hole into the skull, and insert a sensor cabled to a diagnostic machine - for weeks at a time.

VR Interfaces: HYPER-IMS

The Hyper IMS system is a prosthetic implant designed to track and monitor a person's blood pressure in real time. Designed to reduce the need for continual doctor visits, unnecessary drugs and stress, the prosthetic organ is implanted directly into the femoral artery in the groin. There, it monitors blood pressure thirty times a minute.

Experiments in Low Pressure
A great article for players and developers alike, who are thinking of taking a sabatical, and the courtesy you should show as such, before leaving everyone high, and dry.

Haptics Theories Upturned: Pressure Independent of Velocity
It has been a staple of our understanding of the processes behind human dexterity for decades, that the faster you push at something, the more force you exert. Now, it seems that is not actually accurate.

Experiments in Low Pressure
Playing a character can sometimes conflict with play styles, and so this article on roleplaying round your play style comes in - don't take on anything you cannot play, and do make plans in-world if you pln to be away for a while.

Adding Haptics to a Second Skin
Researchers have prototyped an electrotactile second skin to be worn over the first, which adds additional pressure sensation to the user's own sensory capabilities – it makes the natural skin much more sensitive to touch.

Haptics via Ultrasound
All manner of approaches are being fielded these days to try and create a workable haptic interface, that allows the true feeling of touch to an object that is only virtually there. One of the more esoteric, is the use of sound to shape the pressure fields in the air. Specifically, the use of ultrasound.

VR Interfaces: Wii Balance Board (Wii Fit)

The Wii Balance Board is literally as it sounds. It is a small, white board you stand upon, with internal pressure pads in formation, to detect any slight changes in weight as your posture changes on top of it.

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