Future
It is difficult to predict the future of virtual reality with confidence. In the short run, the graphics displayed in the HMD will soon reach a point of near realism. The audio capabilities will move into a new realm of three dimensional sound. This refers to the addition of sound channels both above and below the individual or a Holophony approach.
Within existing technological limits, sight and sound are the two senses which best lend themselves to high quality simulation. There are however attempts being currently made to simulate smell. The purpose of current research is linked to a project aimed at treating Post Traumatic Stress Disorder (PTSD) in veterans by exposing them to combat simulations, complete with smells. Although it is often seen in the context of entertainment by popular culture, this illustrates the point that the future of VR is very much tied into therapeutic, training, and engineering demands. Given that fact, a full sensory immersion beyond basic tactile feedback, sight, sound, and smell is unlikely to be a goal in the industry[citation needed]. It is worth mentioning that simulating smells, while it can be done very realistically, requires costly research and development to make each odor, and the machine itself is expensive and specialized, using capsules tailor made for it. Thus far basic, and very strong smells such as burning rubber, cordite, gasoline fumes, and so-forth have been made. Not content to serve only its customers' eyes and ears, Japan's NTT Communications, of Tokyo, has just finished testing an Internet-connected odor-delivery system to be used by retailers and restaurants to attract customers. But as new trials and applications are tried out and more data gathered, Hamada says he is sure the technology “will take communications to a new level in content richness, compared to today’s communications, which only offers images and sounds”.]
In order to engage the other sense of taste, the brain must be manipulated directly. This would move virtual reality into the realm of simulated reality like the "head-plugs" used in The Matrix. Although no form of this has been seriously developed at this point, Sony has taken the first step. On April 7, 2005, Sony went public with the information that they had filed for and received a patent for the idea of the non-invasive beaming of different frequencies and patterns of ultrasonic waves directly into the brain to recreate all five senses. There has been research to show that this is possible[citation needed]. Sony has conducted tests and says that it is a good idea.
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