Liu et al. / PNAS
Researchers at the City University of Hong Kong have developed a lollipop-shaped device that allows them to taste flavors while immersed in virtual reality (VR).
The device adds a new layer of realism to VR, potentially improving applications in games, education and even culinary exploration.
The device works through a process called iontophoresis, which uses the flow of ions through hydrogels to deliver flavoring chemicals to the tongue. Unlike older, impractical methods that relied on storing large quantities of flavoring agents, this device uses electrical stimulation to simulate flavors.
Small amounts of hydrogels infused with flavor compounds are activated by electrical signals, which vary in frequency, direction and intensity to reproduce the five basic flavors: bitter, sour, sweet, salty and umami.
The device is safe and easy to use, emphasizes . The electrical stimulation involved is low-level and harmless, ensuring a pleasant experience. The device contains nine flavor-generating channels, each filled with flavored hydrogels, including sugar, salt, citric acid, cherry, passion fruit, green tea, milk, durian and grapefruit.
When activated, these gels release chemicals onto the surface of the device, which then interact with the saliva on the user’s tongue to produce distinct flavors. The process is described in a study recently in the journal Proceedings of the National Academy of Sciences.
The creators foresee a wide range of applications for their VR lollipop. It can be used to virtually demonstrate foods before purchasing them in real life. This would allow consumers to avoid buying products they don’t like.
The device also opens doors to, for example, exploring a VR world where you can taste dishes from different cultures or learn about nutrition through a simulated tasting. In gaming, it could add a new dimension by allowing players to experience flavors associated with in-game actions.
Restaurants could also use the technology to preview menus and companies could even adopt it for virtual product demonstrations.
However, there are inherent challenges. Current flavor options are limited and expanding the line will require more research. There are also concerns about misuseas with any digital tool, and the potential for unintended or inappropriate applications can raise ethical questions.
